Esp8266 relay module not working. 3v (on) 0v (off) But the relay doesn’t trigger.

Esp8266 relay module not working 3v and GND (mark with yellow color on the picture) PIN, the Relays are unable to switch/click (m… Oct 19, 2020 · Wawa: This module doesn't have an optocoupler, so digitalWrite (RELAY_PIN, HIGH); is irrelevant. There is a 1 Channel 5V Relay Module With Optocoupler SRD-5VDC connected to GPIO4. I have tried a 2A separate power supply for the module and yet i still only get an led on activation and no relay energising Is the module dead, this is on both channels which seems odd May 29, 2023 · About The Board: Our ESP8266 Relay Board is designed around the ESP-12E module, one of the most common ESP8266 boards out there. Feb 12, 2024 · Re: ESP-01 w/ ESP8266 Relay V2. But after configuration, 2 relays are working but 2 relays are not turning on but their light indicators are turning on. I found a problem on this board when working with it. Mar 26, 2020 · Have you tried powering the ESP and relay separately to ensure your power supply isn't part of the problem? Have you tried connecting the input of R3 alternately to 3. The problem occurs during boot nodeMCU. At this point you should know if all channels of the relay module are working and also the switching logic (inverted/noninverted). All worked fine. When I load the code I can see on the monitor that something is changing. They have the ability to set the relay activating state, high or low. I cannot understand which is the pin that I should supply with 5 or 3. To buy the ESP8266 S How the Relay Module Work? An electromagnetic relay module is a device that allows low-power microcontrollers, like the ESP-01 (an IoT module based on the ESP8266 microcontroller), to control high-power electrical devices. Have a songle SRD-05DCV etc module and an ESP8266. i assume 12 V supply is same as the one used for Arduino nano setup, so not doubting on it's current capability. This is why GND (0V) from the power supply, 0V from the GPIO pin, 3. Oct 9, 2023 · Hello everyone, it’s my first post here ! This issue is driving me crazy, since I’ve re-read many posts about how to drive a 5V relay board with my ESP32, and it looks like I’m doing things the right way (theoretically)…but the setup is still not working ! and is producing a really strange behaviour. The RemoteXY mobile app controls the ESP8266 ESP01 Using a relay with the ESP8266 is a great way to control AC household appliances remotely. Apr 22, 2020 · Build a web server to control any Relay Module remotely with an ESP32 or ESP8266 NodeMCU to control AC household appliances using Arduino IDE. Why does my relay don’t work? I used different codes from here but it’s not connecting to my Blynk. It is easy to set. SO, I connected up (without relay) ESP8266 with an LED light - used wifi to turn on light - all seems to work ok Then connected in the Relay module - when activated the LED on the relay light up but Jan 5, 2017 · I bought couple of them for Arduino use, seller must ship wrong one (for 12V) instead (5V). In fact even if a new unprogrammed ESP-01 is inserted, it triggers the relay on startup. I'm using an ESP-01 module and this USB to Serial breakout board. Apr 3, 2017 · 2-relay module works "better" than 1-relay module: in terms of accuracy LOW gpio -> relay on; HIGH gpio -> relay off. 2K subscribers Subscribed Apr 5, 2021 · I have been trying to get a ESP-01 and HW-655 relay board. unfortunately the relay itself Using a relay with the ESP8266 is a great way to control AC household appliances remotely. Warning: in this example, we’re dealing with mains voltage. Introducing Relays A relay is an electrically May 18, 2020 · Today we will build Home Automation with ESP8266 Web Server & Relay Module Control Home Appliances from Local Network. I wonder if the ground from the 5volt outlet could be split up, one for NodeMCU and one for the relay. Adjust your code accordingly. Aug 21, 2018 · ieee488: ESP-01 and ESP-01S How program and use the Pins and Leds . I am able to get everything working but when I connect the 120V to the relay side my ESP will stop working after a minute or 2 sometimes longer or shorter. The power supply comes from the USB to ESP-01 adapter (but the same ha Oct 18, 2023 · The project described here is an ESP8266 NodeMCU Two Channel Relay Module. Maybe, maybe not. Have you wondered how the relay module works? In this Instructable we will see how an Relay works and how to Interface Relay with NodeMCU. now I try to flash it with esphome, I know the way how to flash (at flashing time 2 pins need to be connected). Nov 8, 2020 · I am working on a simple circuit whose goal is to control a high voltage device (e. The relay should click then you start the esp or not? Because it has 1 then the button is not pressed. If I do not connect that part then the relay and ESP will working properly. This Instructable shows how to connect a relay module to an esp8266, something that should be straight forward but needs a few extra components to make the relay work correctly if you're using the small esp device in the pictures. Step-by-step circuit, Arduino code, real-life applications, and troubleshooting guide included. Find this and other ESP8266 tutorials on Newbiely. Jan 8, 2020 · Hi, I Am Making A NodeMcu Blynk Home Automation Project. This tutorial describes how to control the relay module with ESP8266 NodeMCU. Features: Integrated design. 9 And 4 Channel 5V Relay Module. I'm not sure what is the issue, Please help to fix Jan 31, 2025 · Hey guys can you help me this esp8266 relay module not working my pc cant see this board in ports arduino the cable supports data Oct 19, 2024 · I am using ESP8266 nodemcu with MCU Base. I have tried to create a program to turn the relay on and off, and when I give it 5v power on the VIN pin in nodemcu or 5v from external, the program does not work, the relay just turns on but does not execute the program code. This tutorial explains how to control a relay module with the ESP8266. The diagram shows wiring for a 2-channel relay module, wiring a different number of channels is similar. 3V from the power supply, 3. But it seems that if I connect any Relays to this 3. So - no wonder why there is no relay working. enricotaormina December 21, 2017, 9:25pm 9 Mar 27, 2017 · Im not sure but it looks like it's not a closed circuit, the 5 volt. The only button in the module is connected to the RESET pin of the ESP8266 I already have added this code pinMode(0, OUTPUT); digitalWrite(0, LOW); // make GPIO0 output low What am I missing. I’m using the 12V 2channel relay module LC tech. To program ESP8266, FTDI Converter is required to be connected with ESP8266. a lamp) thanks to a (3V3) relay module, ESP8266-01 and the MQTT protocol. Then the water valve conected to relay switches to open. Possibly too high - to 4. Also, with this ESP8266 Nodemcu web server knowledge, you Apr 23, 2021 · It made no difference. Can you provide a product link for that? And when doing my second point, you still need to remove the pulldown resistor from your relay module. So, after power outage my garage doors would be open Is there anyone out there having a solution to this problem? A workaround I already have: Raspi Zero Jun 7, 2018 · I use modules with 2 or 4 relays connected to nodeMCU. The transistor on the relay board is probably not switching OFF completely and the relay stays activated due to the lower dropout voltage. Learn how to connect 4-channel relay module to ESP8266, how to program ESP8266 tp control 4-channel relay module step by step. This is wiring diagram, im wiring base on it except im using 6V power instead of 9V: This is my code just to test if the relay is blinking: … 1 This is my first time using an ESP8266 WiFi module, and I'm having a lot of trouble just setting it up. We connect ESP8266 WiFi Serial Transceiver Module to ESP01/01S Relay Module so that we can control the relay via WiFi. And the same problem: on power-on there is a short level toggle on the GPIo0 which triggers the relay. This board enables users to control 2 x relays remotely. Using relays with the ESP8266 is the best way to remotely control AC home appliances. A schematic of the driver/module? If you remove all power supplies, you can measure your self how much resistance there is between driver input and ground. I am trying to use 5V 30A relays (spec SLA-05VDC-SL-C) to up the amperage but they will not I am pretty new to NodeMCU (ESP8266) and Arduino IDE in general. All working on 10A 3V relays, multiple installations, all fine and dandy. Try adding only one relay and monitor the 3. Here’s a compilation with some of the most common problems with the ESP8266 and how to fix them. I'm Powering My NodeMcu With A Prototyping Power Supply's 5V Pins. Jan 2, 2024 · Using a relay with the ESP8266 is a great way to control AC household appliances remotely. 0 for ESP8266 mesh network tutorial ESP8266 relay hardware fixmore Nov 30, 2023 · In this tutorial, we are going to make a "Smart IoT Relay Module" using ESP8266 ESP01 Wifi Module. Some days ago i bought this, basically it’s a ESP8266 Relay Module, it contains a ESP-01 (Ai-Cloud inside) and a Relay, all in one single module. Well (regardless of whether the relay activation state is 0 or 1) during boot the relays are activated briefly one after You can use this 5V Relay Module with ESP8266 to connect your single channel applications like garage door opener, coffee machine vender, toaster, TV switch etc. Well, and of course, as is usually the case, something is not working. I could post the full code if that would make things easier Is there a trick that could be done to Feb 23, 2025 · In this post we are talking about this handy little gadget called a 5V single-channel relay module. Misuse can result in serious injuries. Aug 7, 2020 · Hi I have a problem with ESP-01, i have bought a simple relay no/nc. So I started investigating I found the reason: the relay is a 5 Volt Disclaimer:As an over-engineered fun project, I found a way to work an optocoupler into this fix where a standard transistor would have done well. I’ve flashed the ESP-01s using ESPHome-Flasher-1. The relay board has two buttons on it (S1 and S2), as well as 4 LED's (D4,D5,D… Mar 28, 2020 · hi all, I have a esp-01s attached to a relay board acting as a switch between two usb ports. It is fairly easy to turn that into a WiFi controlled 4 channel relay with an ESP8266. Jul 12, 2018 · Then which part of this topic ESP8266 Relay Module working with Blynk marked as “Solved” ? I’d assume that the original topic was marked as solved at the point when the OP felt that the original question had been answered. This allows remote switching via the cloud while maintaining local control. Decided to use the ESP8266 as the main controller. Connect 5V relay with nodemcu (ESP8266) - circuit diagramSmart switch Dec 12, 2022 · Hi. It could control the relay by Android phone APP within the local area network (LAN). Because such modules work in 5V logic, I added a transistor at the input so that it can be used in 3. #include< Jul 3, 2020 · When I first powered the ESP-01 and then connected the signal GPIO of ESP-01 to IN of relay the ESP-01 worked correctly by controling the relay module trough cayenne dashboard. Feb 21, 2021 · So which GPIO pin are you using for the ESP-01S relay module ? If the schematic here is correct for your module, ESP8266 ESP-01S Relay Modul – STEINHORST. But the relay does not move. 3v (on) 0v (off) But the relay doesn’t trigger. There is also Liquid Water Level Sensor conected to GPIO2. 3Relay Troubleshooting #2 door TD-er » 12 feb 2024, 19:36 If it starts with such a WiFi network, then I guess you did not successfully flash ESPEasy on the module, did you? Learn how to use ESP8266 and button to control relay, how to use ESP8266 and button to toggle relay. esp8 Sep 1, 2021 · Wiring a Relay Module to the ESP8266 NodeMCU Board Connect the relay module to the ESP8266 as shown in the following diagram. 3v for the swipe sensor and for the 10A relay. I have left it running for 2 days striaght without any issues. I In this tutorial you learn what a relay is and how to use it to control up to 250V with your Arduino, ESP8266 or ESP32 microcontroller. When the water in the tank raises, the level sensor send a signal to GPIO2. Recently I wanted to use an existing code and tutorial using esp8266 d1 mini, ds18b20 sensor and relay. then you don’t need the ground to the external supply. Nov 23, 2021 · Hi guys, my want to control the water motor with esp8266 thourgh the relay. This will help not to trigger relays accidentally when MCU is reset due to either an ESD event or a spike on it's one of the pins. I'm Using An Nodemcu 0. Jan 31, 2025 · In this project, we will create a smart home automation system using an ESP8266 NodeMCU, Arduino IoT Cloud, and a 4-channel relay module. Screw terminals help user to connect devices and power the supply. My goal is to get the module to run a simple Arduino Blink sketch so that I could proceed to writing more complex code. Please can you elaborate more. Then using a push button. 0 TB:IOTMCU. Two LEDs indicate relay operation. Then you would have a closed cuircuit between the relay and NodeMCU. e. Here is the wiring diagram Any . The Problem Pull down BOOT and power it on, can see that I have Aug 29, 2019 · Hello, I’ve been playing around with a relay the past two nights. 0. 1 comment 󱎖 Why is a relay circuit with ESP32 not working? Ahmed Samir ESP32 ESP8266 For Beginner 1y · Public Why is a relay circuit with ESP32 not working (microcontroller, Arduino, relay, ESP32, electronics)? Євген Цілюрик and 6 others 7 reactions · 13 comments · 1 share Tete All ESP8266, ESP32 & Microcontrollers 1y Interface Relay Module With NodeMCU: Hello Makers! I hope you know what is an Relay Module. 3v and gnd of nodemcu, when i connect relay to nodemcu, its turned on and work with another power source that i connected to jd-vcc, but when i use that power source that i used for jd A popular relay board that is available at the Chinese webstores is a 4 channel opto isolated relay module. g. 3V and GND instead of GPIO2? Have you measured the current the relay takes by connecting A2 to GND with an ammeter? Aug 1, 2025 · I m implementing a home appliance automation using ESP8266 interfaced with Relay Module JQC3F-05VDC (as a switch). Dec 12, 2020 · Hello, I want to control my relay by using Blynk. Wifi Relay With ESP8266: This wifi relay can controls any device like lamps or your soldering station with your smartphone or your computer. 4 V. Jan 8, 2020 · Hi everyone, Been playing around with Arduino and came across this pretty neat chip ESP8266. ORG , the relay module has a 10k pull down resistor which may cause problems if the pin needs to be high at boot time. Check wiring of COM and NO pins. I have read quite a few articles describing the state of the pins on boot so I have tried to connect to one that is “High” on boot, but it seems to have had no effect. In this tutorial, we only used the following materials: USB to UART FTDI Converter ESP8266 WiFi Serial Transceiver Module and last but not least, ESP01/01S Relay Module. 1-relay module seems to trigger only once, and then keeps the relay on no matter the gpio value (just like if relay IN is always shorted to ground). Hope you could help me on the problem. Dec 18, 2019 · This tutorial explains how to control a relay module with the ESP8266 NodeMCU. We will learn how to configure a wireless WiFi relay with the ESP8266 ESP01 or ESP01S module to control the switching on of a light bulb. Jan 29, 2024 · ESP8266 single-channel relay development board is equipped with ESP-12F WiFi module, I/O ports are fully led out, and various power supply modes such as AC90-250V/DC7-12V/USB 5V are supported. The relay stays on the (on state) and doesn’t change whenever I turn on and off using esp32. this small board can be used for Jan 1, 2019 · However, on boot or reset, the relay triggers momentarily which causes the connected device to come on which is unwanted behaviour. I followed various documentation / blogs to set up 2 Channel Relay with NodeMCU chip. . Sure, a Lolin or Wemos board will do, but as we only need to control 4 channels, the simple ESP8266-01 suffices. Works fine I have got Blynk talking to the ESP-01 and I can turn the blue LED on and off on GPIO1 Tried using the Virtual pin to run the code to send the Mar 13, 2022 · The relay does not work! The ESP8266 receives the signal to switch (led lights up in both ways, open and close). There is a wide variety of sensors, modules, and peripherals compatible with the ESP8266 NodeMCU boards. 6 KB I would like to use it with an Arduino board though, so the relay command must come from an external source, not from the ESP8266/ESP01 that is usually coupled to this kind of relays. I have searched and found plenty of result on the internet for these symptoms. Th By MANORANJAN DAS. This module is widely used in the realm of Internet of Things (IoT) for home automation, remote switching, and other applications where wireless control is desired. Some switched 230 Volts (yes, there is an opto-coupler on the module for isolation!), some switched 24 Volts DC. Below is sketch code for it. In any case, since it is "active low", the input pin is if anything, pulled high by the module. The two LEDs on relay module is working fine but the relay is not mechanically changing its connection internally. My Schematics Are As Follows: D1(Of NodeMcu) To IN1(Of Relay) D2(Of NodeMcu) To IN2(Of Relay) D3(Of NodeMcu) To IN3(Of Relay) D4(Of NodeMcu) To IN4(Of Relay Jul 19, 2024 · Let us continue exploring the ESP8266 Module by making a project to Control a Relay from anywhere in the World using ESP8266. How to use a RELAY with ESP8266 NodeMCU | Easy Guide INOVATRIX 9. Adding the capacitor fixed it. So i plugged 5V and GND to the Relay and connected the ESP, i connected the tx+rx , did a small configuration using AT commands with the serial but i didn’t want to use that firmware, so i thought to flash Mar 7, 2025 · Hello everyone. Arduino, ESP8266 and Relay Module). in this video, I clearly discuss how to solve the problem of this esp 01 single channel relay module. Aug 14, 2020 · Contrary to esp-01, on the esp-01S io 0 and io 2 pins have a pull-up resistor. Then I tried with a Nodemcu, as I intend to put this into practice using wifi. To power this circuit, I am using a 5V Sep 12, 2025 · Learn how to interface a single channel relay with ESP8266 for home automation projects. edit: seems like it is actually the other way around. ESP8266 is easily available as a module. However when I p Oct 12, 2022 · One possible reason for the relay staying on is if the Vcc of the relay module is 4. 3V in order to make it toggle. The detail instruction, code, wiring diagram, video tutorial, line-by-line code explanation are provided to help you quickly get started with ESP8266. Use a state variable for the state of the relay, don't read back the pin (does it even work to read the state of an output pin with digitalRead on esp8266?). I Am Powering My Power Supply With A 12V 1Amp DC Adapter. You can also use the VIN pin to power the relay with 5V. 3V Relays (with optocoupler) on NodeMCU ESP8266. Any voltage less than ~9V will trigger the relay module when it's connected to a 12V supply. Feb 10, 2018 · Hey guys! I’m a newbie in this world. But I don’t know why the device is not working. You'll also build a web server to control your devices remotely. All you need is an account in the aREST application and a web browser with internet connectivity (after setting up the hardware i. It is super useful for our microcontroller projects whether we are using Arduino, Raspberry Pi, or even the ESP8266/ESP32. The relay board provides all of the ESP-12E’s external requirements, includes one 10A relay, and a Qwiic (I2C) connector. The mobile app interface is created with the RemoteXY web interface and the generated code is copied into the ESP8266 ESP01 relay FLProg program. Thank you! I do not provide links for where to buy these - SORRY! To find them just type in "ESP8266 Serial Relay" or "LC Tech Relay" into your preferred cheap electronics supplier (Ebay, Aliexpress). 3 V supply pin on an Oscilloscope if possible. Learn how to control a relay module with ESP32 board: Guide Jan 25, 2022 · Hi, I'm testing two 3. 3V ESP-01 with schematic below. It is a simple and reliable way to get your automation task executed successfully. when done disconnect usb flasher from computer and put esp module into relay board. I programmed the ESP to start a portal through which I can derive the relay by triggering GPIO-0 & GPIO-2. If it is sufficient. I have a 5V 2 relay module, connected to a ESP8266. I’m powering up my ESP32 through its 5V and ground pins, thanks to an external 5V Mar 15, 2024 · That part number is only the relay itself, not the relay module, that you use. APP remote control. First off using an Uno, which triggered the relay to power and LED. 0 this is the yaml I flashed esphome: name: elsbeths_charger_test platform: ESP8266 board: esp01_1m wifi: ssid: !secret ssid password: !secret password # Enable fallback hotspot (captive portal) in case wifi connection fails ap: ssid: "Elsbeths Jan 10, 2025 · I have about half a dozen of these modules: and after a couple of days, weeks or months (switching once or twice per day) they all stopped working with the same symptom: the light does not switch off anymore. The 2 channels can be controlled remotely using a webserver/WiFi connection. Nov 9, 2020 · I am working on a simple circuit (for debugging purpose) which switches a 3V3 relay every second through the Esp-01 GPIO2 pin. Both the ESP8266-01 and the relay board have their peculiarities, that in this case Jul 18, 2018 · Hi there, I am trying to use an ESP8266 to control a light switch wirelessly connected to a relay. Oct 4, 2019 · If 2. The problem is that everything is working fine from the beginning, but after Apr 28, 2020 · Hi I have a nodemcu esp8266 and double relay module that connected together for simple project that i have intent to develop it more . 1 on input of the relay is meaning the relay is off. Understanding the Relay Module At the heart of this module is a 5-pin 5VDC SPDT relay Mar 26, 2023 · Hi there. 3 Min Trick Of How To Control 1 Channel Relay With ESP8266 NodeMCUCOPY PASTE THIS LINK IN PREFERENCES (ADDITIONAL BOARDS MANAGER URLs) : http://arduino. Im desperately looking for some help, I have a ESP8266-01 with a dual Relay module. Jun 7, 2019 · use esphome-flasher to flash the ESP8266 module with the firmware you just compiled. Mar 10, 2024 · Hello, I would like to ask you all for help to solve a problem on a relay that I am using with the nodemcu ESP8266 microcontroller. This article is a compilation of 25 free guides for ESP8266 sensors and modules. Feb 26, 2023 · Using relays with the ESP8266 ESP01 is the best way to remotely control any AC home appliances. I have the relay module labeled: ESP-01/01S Relay v4. 6 volts but the control voltage is 3 volts from the ESP8266. Let us break it down together, what it is, how it works, and how we can connect it. Fixed just by replace relay for right one. ESP-01 WiFi Module IncludedDescription: ESP8266 WIFI 4-Channel Relay Module is 4 channel WIFI relay module carries an ESP8266 WIFI module and a mature 8 bit MCU, with a Professional switching power supply circuit. I tried all combinations. 3V or 5V depending on module). Wire a button between io 2 and ground and you will read LOW if the button is pushed. I've been troubled by this problem for weeks 😢 Old post: Esp8266 serial not working I think I should add something so I post this What I want to build: I am trying to make an air conditioning infrared remote control with brightness detection and temperature detection . Is it a voltage issue? or circuit issue? I’m using a d1mini connected to 5V 4 channel relay board powered by Hi-Link power supply 5V-0. This is a companion guide to the Home Automation using ESP8266 eBook. This tutorial explains how to control a relay module with the ESP8266 NodeMCU. Aug 4, 2020 · I'm using a Relay Channel and NodeMCU(8266-WIFI). Sep 12, 2025 · Check if your relay module is active LOW or active HIGH. Relay […] Oct 30, 2020 · Hello guys, This video includes how to control a Relay module using the ESP8266 Nodemcu Web server. Jan 21, 2016 · ESP8266 Troubleshooting Guide The ESP8266 has a few common issues, specially when you are trying to flash a new firmware or uploading scripts. I communicate with the relays via serial commands. Three months later the code you’re trying to use was tagged on to the end of the topic by a user who hasn’t posted anything else, and has spent the grand total of Jul 20, 2017 · What kind of relay driver you use? Driver or module? What is there in the other end GPI00 lead? A relay driver should not load much but you never know (especially when we don't know). Subscribed 253 35K views 5 years ago hardware fix ESP-01S Relay V1. So let’s get Started! WiFi / Internet Controlled Relays Using ESP8266 - Quick, 30 Minutes IoT Project: ESP8266 is a very popular device for IoT these days. . Basically, We will build a web server to see how the relay module works, how to connect the relay to the ESP8266, and control a relay (or as many relays as you want) remotely. When i trigger the connection, LED Turns ON in Node MCU But the Relay connection is not working. I am using esp8266 arduino to control this, 3. Jan 3, 2023 · Frustrated With an ESP8266 Not Responding? Don’t Worry! We Have the Steps You Need to Take To Get Your Device Working Again. 3V from the GPIO pin, and 5V from the power supply all trigger the relay; they're all well under the needed voltage level to stop the PNP transistor from In this project, we will use an ESP8266 NodeMCU to control four relays using both Arduino IoT Cloud and manual push buttons. did not worked, check if the relay board is not intended for use with 12 V DC power source (check the relay marking). Ensure the relay VCC is supplied with enough voltage (3. after uploading to the device the bin that is generated by HA and putting the device into the relay the result is that Learn how to use Relay Module with ESP32 or ESP8266 to control AC household appliances using MicroPython firmware. this is my code that is existing in HA ESP. Using the NC port of the relay doesn't change anything on the signal line. We’ll take a look at how a relay module works, how to connect the relay to the ESP8266 and build a web server to control a relay remotely (or as many relays as you want). Its a small and dirt cheap device which has a inbuilt controller running at 80Mhz and with optional firmware it can be used as a stand alone device without… Feb 20, 2020 · I’m trying to create a switch board with 4 relays and momentary switches. DC 5V work power supply Learn how to connect 2-channel relay module to ESP8266, how to program ESP8266 to control 2-channel relay module step by step. When I heat the sensor it supposedly turns on the relay, when I cool it supposedly turns off. com. Why? Becau Jun 20, 2024 · i have already built a system that take a swipe action and checks with a central server and grant or denys access to power via a relay. It was a bit faffy at first as I Jul 16, 2024 · ELEC-ESP-RELAY-PK-NWM800×800 44. 1. 0 Board - Solution, Board is not working due to design issue. It depends on whether the initial "flash" on is due to the optocoupler or saturation of the control transistor. I was connect two IN1,2 pins to d4 and d1 of nodemcu and vcc and gnd to 3. Smart Relays are installed devices that can The ESP8266-01 Relay module is a compact and versatile component that integrates the popular ESP8266 WiFi module with a single relay, enabling wireless control of various appliances and systems. Dec 29, 2021 · Hi The problem was already discussed here for an older version, v1. I took a closer look to the relay board: Neither GPIO0 nor GPIO2 seem to be connected to the STC chip on the relay board. I understand that the serial code needs to be sent via the esp to another chip on the relay board I have loaded the blink code that operates the relay using this serial information. The project works with 5VDC. Fix 5v relay module for ESP8266 v1. After I try to give it 3v power from I am using an esp32 and a 5V 10amp relay with “HomeSpan” to trigger it the command does work If I connect a multimeter on gpio17 and ground And I give the turn and off command the multimeter shows the voltage as 3. Next step, using an external power source, so the board was separate from switching transients/current. Make sure your load is connected properly and powered correctly. 6A (3 watts). 3V logic. With the ability to easily add sensors and other modules via the Qwiic connector, this WiFi Connected Relay becomes quite useful for basic Feb 19, 2021 · I'm trying to drive a 5V relay with 3. ixeoiqs jsq whkhg buo ybgyb zmkib zygmgaw day iwo zzq apfl atx lobzo gmvjxge waey