esp8266 relay schematic

We will control relay with ESP32. PDF ESP-01S Relay v1.0 1. Description - Instructables After receiving the signal through LoRa, Arduino turns ON/OFF related relay and sends the feedback to ESP8266 through the LoRa module. ESP8266 first project: home automation with relays, switches, PWM, and an ADC ESP8266 by Espressif Systems is a popular low-cost microcontroller chip with a full TCP/IP and Wi-Fi stack. LoRa IoT Project With Arduino ESP8266 Blynk Control Relay ... Using ESP8266 and MIT App Inventor to control a Relay | IoT esp8266+01+schematic - Search - EasyEDA You can also read our other Guide to control a Relay Module with ESP8266. Circuit of the MQTT ESP8266 NodeMCU control relay. Today, we will talk about ESP8266 12e Pinout (pinning), or in other words, NodeMCU. In this tutorial I will show you how to convert an old power strip into WIFI remote control. - Components & Circuit Diagram:- RELAY IN1=4 ARDUINO DIGITAL PIN RELAY IN2=5 ARDUINO DIGITAL. Relay — ESP Easy 2.1-beta1 documentation ESP8266-EVB is board suitable for resarch and development of espressif's ESP8266EX chip. Esp8266 Wifi Microcontroller With Integrated 5v Relay ... This is a WiFi relay module based on the ESP8266 serial module. For that, use the circuit diagram below. The device is currently planned to be battery operated . Esp8266 5v wifi relay module b us 3 50 haoyu electronics make engineers job easier board easyeda rnix labs crashes when it drives attached to ac everything shield with esp 01 10a 220v network input dc 7v 30v 6 00 github gustavofbreunig switch control for lamps iot . ESP8266 Projects on Internet of Things 2022 - IotCircuitHub NodeMcu (ESP8266) Based Relay & LED Control Using Web Server Refer to the following diagrams for each and set up the hardware accordingly. Buy ESP8266 10A DC 7-30V WiFi Relay Module Online - Robu.in Hence, the safest ESP8266 pins to interface with relays are: GPIO 5, GPIO 4, GPIO 14, GPIO 12 and GPIO 13. - Components & Circuit Diagram:- RELAY IN1=4 ARDUINO DIGITAL PIN RELAY IN2=5 ARDUINO DIGITAL. After receiving the signal through LoRa, Arduino turns ON/OFF related relay and sends the feedback to ESP8266 through the LoRa module. When the relay is active the COM terminal and NO terminal of the relay are connected so that the circuit is complete and the AC power source can power the sprinkler valve. Not all GPIOs are exposed in all ESP8266 development boards, some GPIOs are not recommended to use, and others have very specific functions. Controlling a relay with the ESP32 is as easy controlling any other output, you just need to send HIGH and LOW signals as you would do to control an LED. LoRa Arduino ESP8266 control Relay with feedback. . Relay Module Connection. If so, that is your problem. For example we will be able to turn on and turn off a heater, fan or light over the internet. Hello friends! We support the APP and LUA source code. The board takes 12VDC as input and controls two 12V relays. I can't seem to find the actual schematic for Version 3, ESP8266 NodeMCU. Here, you have to map the Hex codes of IR remote in the Arduino Code. It can connect by the server through TCP Client and also can control by the HTTP. ESP32 will give signal to relay depending upon the button state from a web page. This board is to be a used as a general purpose wireless switch to make non-smart devices smart. And the GPIO SD3, D3, D7 & RX connected with the pushbuttons to control the relay module manually. Explained both the t. ESP8266 based relay controller board. (From a little digging it looks like the Wemos is a 3.3V device. PLEASE BE CAREFUL OF HIGH VOLTAGE: Unplug everything before figuring the wiring with the relay. The ESP8266 will turn on the status LED and send the feedback to Blynk cloud once it receives feedback. ESP8266 D1 mini; Power strip; Relay Module 250V 10A A relay is an electrical mechanical switch that . Unfortunately, it appears that many cevices do not have the 0V connected on the input. Connect the relay module to the ESP8266 as shown in the following schematic diagram. Chapter 2 GPIO The connection diagram for this tutorial is very simple since these boards already have all the electronics needed for us to directly control the relay with a GPIO of the ESP8266. In the receiver LoRa circuit, I have used NodeMCU as the microcontroller. Configuration (old version) DYI ESP8266 relay with external optoisolated button. Those "digital relays" are available in 5V and 3.3V models. Hey guys! But it is important to explain that the NodeMCU is formed by an ESP12E, which still has an ESP8266EX inside it. The entire project is powered up using the 5V regulated power supply based on the 7805 linear voltage regulator. Today, for the first time i am going to use Nodemcu ESP8266 with a Web Browser. We will read the state of the push button. In the circuit, I have also made a voltage divider using 4.7k and 10k resistors to drop down the 5-volt logic level to the 3.3-volt logic level. Personally, I really like this component, as it already comes with USB input. Rob Mosh - 1 year ago. We will use a button on web page to control a relay. Please refer to the article on IR Remote control Relay. Using the Blynk IoT app, you can also monitor real-time feedback. 8 relay module schematic. The 8 channel relay module has its own optocoupler also called opto-isolator photocoupler or optical isolator. ESP8266 WIFI Remote Relay Switch. I have used the INPUT_PULLUP function in Arduino IDE instead of using the pull . Nodemcu ESP8266 Web Browser: Nodemcu ESP8266 Web browser Programming and circuit diagram- So far I have been using Blynk IoT platform, Thingspeak, Ubidots, Arduino IoT cloud, and Telegram for controlling electrical devices and for monitoring different types of sensor over long distance using WiFi. An Intro to Relays Basically a relay is an electromagnetic switch. ESP-01S - Wi-fi Relay module for light remote control. Theory I've been putting together a schematic in Eagle Cad for a couple of weeks now, which uses an ESP-12E MCU control 2 independent relays. Regardless i took what little knowledge i have and made a crude circuit diagram. The connections of all the components used in this project is something like this. I've been doing a lot of prototyping with ESP8266 boards for IOT applications and wanted to take a leap into the PCB world. In this Arduino relay tutorial I will show you how to use a relay with microcontrollers. A connection needs to be made from the 0V on . One of my project's most used components is undoubtedly the relay; its working is quite simple; you can find It as a module or only the relay. In the receiver LoRa circuit, I have used NodeMCU as the microcontroller. WeMos D1 (esp8266) manage relay and shield. ESP-12E based control board schematic and PCB photos #42034. Using the Blynk IoT app, you can also monitor real-time feedback. Thirdly, we create the program. You do not have the required permissions to view the files attached to this post. And the power consumption on ESP12 is way of, 70-80 mA is normal operation and its only drawing a bit higher power when turned on and then there is no active relays, so 1 . Nodemcu ESP8266 web server relay control tutorial | Step by step instructions. The diagram shows wiring for a 2-channel relay module, wiring a different number of channels is similar. Explore different ESP8266 projects on Home Automation and Internet of Things using NodeMCU and ESP-01 module.Each projects explained with step-by-step instructions with components list, circuit diagram, source code and all other required resources and information you need to build those ESP8266 projects. *Remember, if you don't have much experience working with high voltages . The input from the switch is opto-isolated so the 5V can be used directly to supply the switch. Secondly, connect these components. Item #ESP8266-RELAY. To control the 4-channel relay module, I have used D1, D2, D5, and D6 GPIO pins. Generic ESP8266 Module; HiLink 5V power supply; AMS1117 IC; 5V Relays (4 pcs) Mct2e IC (4 pcs) 1n4007 diode (4 pcs) 3pin Terminal connector (4 pcs) BC547 transistor (4 pcs) 10 resistors (8 pcs) Circuit Diagram . Nodemcu ESP8266 webserver relay control. The push button will give two logical states either high or low. This is a simple circuit for ESP8266 chip and can be modified more, First of all let's answer your questions: 1- 10K is a normal pull resistor for designers, but if your system is very sensitive on current drawn, or your system is battery powered, it's better to increase pull-up resistor to reduce power consumption while key pressed or I2C transmission. Interfacing DHT11, Smoke Sensor MQ2, and 5v Relay with Nodemcu ESP8266, Circuit Diagram: The above circuit diagram is designed using the CadSoft Eagle Schematic and PCB designing software. Push Button Interfacing ESP8266 using Arduino IDE. For more information about the ESP8266 GPIOs read: ESP8266 Pinout Reference: Which GPIO pins should you use? ESP8266 WIFI MICROCONTROLLER WITH INTEGRATED 5V RELAY, CONTROLS UP TO 250V/10A AC OR 30V/10A DC. I have used D1, D2, D5 & D6 GPIO pins to control the 4 relays. Both can be used with the ESP32 or ESP8266 - you can either use the VIN pin (that provides 5V) or the 3.3V pin. After receiving the signal through LoRa, Arduino turns ON/OFF related relay and sends the feedback to ESP8266 through the LoRa module. Function and characteristics. Can be selected by jumper relay and TTL or ground. However, I will be using SRD-05VDC-SL-C 5V Relay module. Onboard ESP8266 WiFi module, in AP mode, can be connected by 5 clients at the same time. Circuit of the ESP8266 Home Automation The circuit is very simple, I have used D1, D2, D5 & D6 GPIO pins to control the 4-channel relay module. Bearing the nondescriptive name "ESP8266", this highly integrated circuit consists of a 32-bit RISC processor with all the bells and whistles you would expect in a full-featured µC, but that's not all. In the circuit, I have used GPIO-0 and GPIO-2 pins to control the 2-channel relay module.. And the GPIO-3 and GPIO-1 are connected with the pushbuttons to control the relay module manually.. Esp Relay Schematic Calculation Issue Use this forum to chat about hardware specific topics for the ESP8266 (peripherals, memory, clocks, JTAG, programming) 13 posts I want to have an ESP8266 (ESP-01S), which has only GPIO0 and GPIO2 exposed, drive a relay (via an NPN Transistor on GPIO2) and read a button (GPIO0). We all familiar with blinking LED using Arduino boards as this is the fundamental step towards using a new development board. The ESP8266 12-E chip comes with 17 GPIO pins. . The circuit diagram is as follows: The problem is that as soon as I connect the red line, it looks like there is not enough power delivered by the PSU. Project name: ESP8266 ESP-01 WI FI module, 5V relay modules -Webserver. ESP8266 Pinout Reference: Which GPIO pins should you use? Connect the Trigger pin (IN) to one of the digital pin on Arduino here we used 13 pin, and connect the VCC to 5v from Arduino and GND to GND of Arduino. The ESP8266 also includes a built-in 802.11 b/g/n Wi-Fi circuit that is ready to be directly connected to an antenna. One might be a low voltage side and another high voltage side. Wiring a Relay Module to the ESP8266 Connect the relay module to the ESP8266 as shown in the following diagram. The circuit diagram is pretty straight forward. With this smart relay, you will easy to DIY your smart switch to control any device by your phone anywhere. You can have access to schematics, PCB and firmware in this GitHub. Connect the relay module to the ESP8266 as shown in the following diagram. Explained both the t. I made this little home automation project for my light and one small fan. So One ESP PCB and two I/O relay boards. I understand that the esp out only gives 3.5v and my relay wants 5v to activate so i need to use another power supply so my esp switches the 5v using transistor which switches the relay. . Ultrasonic Sensor With Nodemcu Using Blynk App. Additionally, some come with built-in optocoupler that add an extra "layer" of protection, optically isolating the ESP boards from the relay circuit. Does anyone know if there is a schematic out there or where to find it? The circuit is very simple, I have used the GPIO pins D1, D2, D5 & D6 to control the 4 relays.. And the GPIO pins SD3, D3, D7 & RX connected with push buttons to control the 4 relays manually.. ESP-12E Relay Board Eagle Schematic #69197. Esp8266 Relay Module Schematic. The module be used for home automation, smart plugs and lights, mesh networks, industrial wireless control, baby monitors, IP cameras, sensor networks, wearable wlectronics, etc. 11/27/2018 ESP8266 12e Pinout Schematic Circuit Diagram- NodeMCU https://circuit-diagramz.com/esp8266-12e-pinout-schematic-circuit-diagram/ 3/ 8 Hl 52s Relay Module Circuit Schematics Arduino Circuit Diagram Relay. . You can also explore projects with different IoT platform like IFTTT, Blynk. B asics: Project 021e. #85591. In this tutorial, we will learn how to build a wi-fi switch, and use it remotely. Transmitter Lora Circuit Using NodeMCU . Explained both the transmitter and receiving LoRa circuit and source codes and how to configure the LoRa modules with AT commands. This is my second home automation project using the ESP8266 (NodeMCU). I have used the INPUT_PULLUP function in Arduino IDE instead of using the pull-up resistors with each switch.. As per the source code, when the control pins of . Circuit of the Blynk ESP01 ESP8266 Projects. As is usually the case, finding a schematic and specifications is very difficult and the sellers were of no help (no surprises). ESP-01 ESP8266 IRLB8721 AMS1117 LED wire WiFi Switch DIY Smart Home. 2- It's very necessary to add decoupling . I'm not completely sure whether the schematic is right or not, so I'd be glad if you guys pointed out any mistake that you find. There are relay modules whose electromagnet can be powered by 5V and with 3.3V. This allows you to build in device control, operating remote lights or triggering systems when the module is supplied with a signal from an ESP8266 module (included). Hey guys! To control the AC portion of the circuit, I'm using a 5V relay — just interrupt the 220V wire and plug the stripped ends into the Normally Open and Common screw terminals. In this tutorial, we are going to learn basic built-in commands of Arduino IDE which will help to blink LED using ESP8266 NodeMCU and ESP-01 module. ESP8266-EVB is OSHW certified Open Source Hardware with UID BG000015. The ESP8266 will turn on the status LED and send the feedback to Blynk cloud once it receives feedback. ESP8266EX is among the most integrated WiFi chip in the industry; it integrates the antenna switches, RF balun, power amplifier, low noise receive amplifier, filters, power management modules, it requires minimal external circuitry . Connecting the Hardware to Your ESP8266 We can either use a USB-to-TTL converter or use an Arduino to program the ESP8266. The circuit diagram for the project "Control a Relay using ESP8266" is shown in the image below. 1-relay module seems to trigger only once, and then keeps the . Control Relays with Temperature & LDR Relays control by room temperature You can use any relay module. PCB/Schematic review. Many thanks to JLCPCB for high-quality PCB, and EasyEDA web software for making the schematic.. 0 Comment. This will allow us to control electrical devices from the Internet via HTTP. Replace your 5V relay with a 3.3V relay.) . I have used D1, D2, D5 & D6 GPIO pins to control the 4 relays. $11.99 $11.18. The GPIO SD3, D3, D7 & RX are connected with pushbuttons to control the relay module manually. NodeMcu (ESP8266) Based Relay & LED Control Using Web Server. To build it I will use a popular electronic circuit, ESP8266 D1 mini. I have explained the circuit in the tutorial video. PCB designer suggested me not to as some of low voltage traces are near to the Relay Live traces. And it controls the relay working status through the app. In stock. As shown in the above diagram we will be using GPIO 14 (D5) to connect the LED and GPIO 13 (D7) to connect the push button. To build i will use a popular electronic circuit . These two circuits have a different voltage rating. Here is my EasyEDA project -- feel free to edit and use it.. Download project Gerber file.. This is an ESP8266 10A DC 7-30V Network Relay WIFI Module, which based on the ESP8266 and a 10A relay. ID Name Designator Footprint Quantity BOM_Manufacturer Part; 1: 10uF: C1: CAP-TH_BD10.-P5.00-D1.-FD: 1: Non - polar electrolytic capacitors10uf 100v: 2: 47uF: C2 . The only problem you can have is that relay needs some power to be activated, so It's preferable to use a . Wiring a Relay Module to the ESP8266 NodeMCU Board. ESP8266 12e Pinout Schematic Circuit Diagram. Hi! ESP8266 is a good platform for IOT (the Internet of things). The module has and LED that lights relative to the state of the module. See this project here: ESP8266 WIFI Remote Relay Switch. ESP8266 relay module review - Yunshan WiFi relay. In the circuit, I have also made a voltage divider using 4.7k and 10k resistors to drop down the 5-volt logic level to the 3.3-volt logic level. The following picture shows the wiring between the most used Arduino, ESP8266 and ESP32 microcontroller and a relay module. With this module, you can upload your firmware than can maker more perfect IOT project you like. By grandcaret | December 17, 2017. ESP-01S Relay v1.0 1. In the schematic above we have supplied the NodeMCU with a USB power supply from a computer and the relay uses a different 5V power supply. There is reset button for resetting the ESP and spare button to be used as input and extra spare header just for testing. Warning: in this example, we're dealing with mains voltage. The diagram shows the wiring for a 1-channel relay module and 4-Channel Module. How are you powering the . Can anybody guide me where i should add the fuse for protection. In this Lora project, I have shown how to make LoRa ESP8266 Arduino control relay with real-time feedback using the RYLR896 LoRa module. NodeMcu (ESP8266) Based Relay & LED Control Using Web Server. my design here Suggest to use 3A max per each relay , and 3A max per every LED RGB channel. The ESP8266 can't switch high currents or voltages and no AC at all. ESP8266 Pin Diagram. WeMos D1 3v module relay shield at work main. Using relays with the ESP32 is a great way to control AC household appliances remotely. For example, we will be able to turn on and off a heater, fan or light over the Internet. It is as follows. I have done some googlings but still feel i have no clue. Get a 3.3V relay. In this Arduino ESP8266 project, you can also use IR remote to control the home appliances. This document provides introduction to the interfaces integrated on ESP8266. . This article is a guide for the ESP8266 GPIOs: pinout diagrams, their functions and how to use them. Instead of using pull-up resistors with each switch, I have used the INPUT_PULLUP function in Arduino IDE. This is the complete circuit diagram for this home automation project. Here are three methods you can follow to upload the code to ESP8266 — select the one that suits you best. When we use an ESP8266 or ESP32 microcontroller with an operation voltage of 3.3V, we have to use the VIN or 5V output from the USB connection as power supply for the relay module and power the ESP8266 or ESP32 board via USB. Relay driver circuit using uln2003. The ESP can control a relay using one of it's GPIO pins. Description This ESP-01S Relay based on AI-Thinker ESP-01S WIFI module. For most of these relays, we have two pins for powering the device and a third one to control the state of the relay's coil. One of the challenges you may find will be power supply to the relay and ESP8266 NodeMCU since these devices use different voltages. Transmitter Lora Circuit Using NodeMCU . Like ESP8266 is one PCB (Here you can buy a ready made module) and the I2C I/O driver,relay boards in two parts (8 relays per PCB). 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Download project Gerber file and what is the max current can... Will turn on the ESP8266 will turn on and turn off a heater, fan or over! And made a crude circuit diagram maker more perfect IoT project you like be SRD-05VDC-SL-C! Is designed for smart home, Internet of things ) depending upon the button state from a Web Programming. Esp8266 12-E chip comes with 17 GPIO pins Web esp8266 relay schematic to control a relay can. Two I/O relay boards that work with the pushbuttons to control the relay module ESP8266. ; are available in 5V and with 3.3V by an ESP12E, based. Our other guide to control a relay is an ESP8266 10A DC 7-30V WIFI relay module schematic Arduino relay i! Relay using one of it & # x27 ; t have much experience working with high voltages my second Automation... Isolating high voltage from the ESP module on IR Remote to control a relay module has own! This is one of my first designs and first design with SMD components Remote control relays controlling relays IR... At the same time WIFI relay ; and than can maker more perfect IoT project you like really like.! Use it.. Download project Gerber file if you don & # x27 ; s GPIO pins button with ESP8266. Or ground easy to DIY your smart switch to make non-smart devices.! I should add the fuse for protection cevices do not have the 0V esp8266 relay schematic. Explained both the transmitter and receiving LoRa circuit and esp8266 relay schematic codes and how to use ESP8266! Opto-Isolator photocoupler or optical isolator control by the HTTP optocoupler also called opto-isolator photocoupler or optical isolator instead of pull-up. Good platform for IoT ( the Internet via HTTP i really like this component, as it already comes USB. This Arduino ESP8266 project, you will easy to DIY your smart switch control! First design with SMD components here Suggest to use 3A max per every RGB! Has an ESP8266EX inside it trigger only once, and 3A max per every LED RGB.!, Internet of thing and others DIY project Web page to control relay! D1 3v module relay shield at work main mode, can be selected by jumper and. Good platform for IoT ( the Internet via HTTP 3.3V relay. same time the entire project powered! Of the Wemos is a guide for the first time i am going to use a popular electronic,. Important to explain that the NodeMCU is formed by an ESP12E, which on! And what is the max esp8266 relay schematic you can also monitor real-time feedback smart... The pushbuttons to control the home appliances module to the ESP8266 will turn on the 7805 linear regulator. Kit for controlling all your household appliances with your phone wherever you.. Build it i will use a relay that can switch a relay ESP8266. You don & # x27 ; re dealing with mains voltage and EasyEDA Web software for making schematic... 3A max per each relay, and use it.. Download project Gerber file on! A general purpose wireless switch to make non-smart devices smart module manually but can! Can connect by the HTTP overview, parameter configuration, function description, application demos other! That many cevices do not have the required permissions to view the files to. * Remember, if you don & # x27 ; t seem to find it components & amp RX... Manoj R. Thakur schematic for Version 3, ESP8266 D1 mini to as some of voltage... Source hardware with UID BG000015 ( pinning ), or in other words, NodeMCU ( pinning ), in. Chip comes with 17 GPIO pins to control the 4-Channel relay module, still! It & # x27 ; s GPIO pins to control the home appliances i. Lora circuit and source codes and how to use NodeMCU ESP8266 Web Browser development of espressif & # x27 s. Inside it the 7805 linear voltage regulator NodeMCU is formed by an ESP12E, which still has an ESP8266EX it! Relay Web Server control relay and TTL or ground, you can also monitor feedback. Used D1, D2, D5 & amp ; RX connected with the ESP can control the. Two products were identified: Yunshan WIFI relay ; and LED that lights relative the. Edit and use it.. Download project Gerber file max per every LED RGB channel Schematics PCB. Diagrams, their functions and how to esp8266 relay schematic the LoRa modules with commands... Relays controlling relays from IR Remote control relays controlling relays from IR Remote control relays controlling relays IR. For my light and one small fan ESP8266 GPIOs: Pinout diagrams their! I have done some googlings but still feel i have done some googlings but still feel i have D1. You can follow to upload the code sections of this program are described one one! 10A DC 7-30V network relay WIFI module, in AP mode, can be connected by 5 at! Things ) in 5V and 3.3V models and another high voltage and low voltage side ESP-01S... Input from the Internet of thing and others DIY project esp8266 relay schematic Remember, if you don #! Use IR Remote to control the 4 relays have no clue relays IR! Sections of this program are described one by one the first time i am to! For controlling all your household appliances with your phone wherever you are personally, i like... We will read the state of the relay Live traces opto-isolated so the 5V can be by. ; circuit diagram: here we just replaced the Arduino code time i am going use! ( from a little digging it looks like the Wemos is a schematic out there where! Also use IR Remote control relays controlling relays from IR Remote to control the home appliances of. Use them connected on the 7805 linear voltage regulator s very necessary add... Through TCP Client and also can control a relay is an ESP8266 10A DC 7-30V relay! Don & # x27 ; re dealing with mains voltage platform for IoT ( the Internet thing! Be connected by 5 clients at the same time shield at work main depending upon the button state a. Entire project is something like this component, as it already comes with 17 GPIO pins all your appliances! Also work with Arduino should also work with Arduino should also work with Arduino also! To an antenna ; are available in 5V and 3.3V models appears that many cevices do not have the permissions. Module with ESP8266 and receiving LoRa circuit and source codes and how to build wi-fi. Diagram shows wiring for a 2-channel relay module, i have explained the circuit in Arduino. Arduino ESP8266 project, you can also read our other guide to control the relay! Other words, NodeMCU will give signal to relay depending upon the button state from a page... Is given below in industrial application to provide isolation between high voltage and low voltage circuits and. Functions and how to convert an old power strip into WIFI Remote relay switch the! Like this Blynk cloud once it receives feedback to explain that the NodeMCU is by... /A > IR Remote control relay with a Web page to control any by. The following diagram relays Basically a relay using ESP8266 & quot ; control a that. > ESP8266 PIN diagram DIGITAL PIN relay IN2=5 Arduino DIGITAL, in AP mode can... Led wire WIFI switch DIY smart home, Internet of thing and others DIY project the! For the first time i am going to use 3A max per every LED channel... The app wireless switch to control a relay module to the following picture shows wiring... Identified: Yunshan WIFI relay module to the ESP8266 as shown in the following diagram good platform for (. Https: //iotcircuithub.com/lora-arduino-esp8266-control-relay/ '' > MQTT ESP8266 home Automation project for my light and one small.. Esp8266 WIFI module, wiring a relay module to the ESP8266 will turn on the 7805 linear voltage regulator isolating... Input from the switch is opto-isolated so the 5V can be selected by relay... And the GPIO SD3, D3, D7 & amp ; circuit.... The state of the relay module and 4-Channel module, two products were identified: WIFI! To relay depending upon the button state from a little digging it looks like the Wemos is a for. I really like this, D3, D7 & amp ; RX connected with to.

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