How do you use a relay module with NodeMCU?

How do you use a relay module with NodeMCU?


  1. Attach NodeMCU on Breadboard.
  2. Connect VCC of Relay with Pin 3.3V of NodeMCU.
  3. Connect GND of Relay with GND of NodeMCU.
  4. Connect Pin Signal of Relay with Pin D7 (GPIO 13) of NodeMCU.
  5. Connect one terminal of Bulb (Blue Wire) with Pin NC (Normally Close) of Relay.

How many relays can be connected to NodeMCU?

1, 2, 4, 8, 16 Channels Relay Modules The number of channels determines the number of outputs we’ll be able to control. There are relay modules whose electromagnet can be powered by 5V and with 3.3V. Both can be used with the ESP8266 – you can either use the Vin pin (that provides 5V) or the 3.3V pin.

Can we control NodeMCU from anywhere?

Now you can control your ESP8266 GPIOs from outside your home network using any device that has browser! Click the “Turn On” buttons to make your ESP8266 GPIOs go HIGH.

How can I control ESP 01 without a router?

To control the ESP-01 ESP8266 module without a router or an internet connection, the ESP-01 is placed into AP mode (Accesss Point mode). A smartphone or a PC with wireless capability is then used to connect to the module. Command codes are then sent to it thru a browser or an application.

How do you supply 5V to relay from NodeMCU?

Connect your 5 V relay supply to Gnd and “JD-VCC” on the three terminal connector. Connect your ESP8266 I/O line(s) to the relevant “IN”(s) on the relay board. Connect your ESP8266 5 V supply and not the 3.3 V to “Vcc” on the ten pin connector. Do not connect Gnd to ground on your ESP8266 board.

How do you control NodeMCU?

  1. Step 1: Materials Required. ESP8266 NodeMCU.
  2. Step 2: Installing NodeMCU Board Package. Open up Arduino IDE.
  3. Step 3: Pin Connections. D7 of NodeMCU to LED’s +ve.
  4. Step 4: Source Code. In code.
  5. Step 5: Uploading the Code.
  6. Step 6: Controlling the LED.
  7. 4 People Made This Project!
  8. 26 Comments.

How do I connect my ESP 01 to Wi-Fi?

To see if it works, open the Wi-Fi settings on your computer, look for a network called “ESP8266 Access Point”, enter the password “thereisnospoon”, and connect to it. Then open a terminal, and ping to 192.168. 4.1 (this is the default IP address of our ESP AP). You’ll see that the ESP responds to your pings.

Can blynk work without Internet?

Blynk App can be used when Internet speed is good on both sides & Bluetooth Automation App can be used when you are near the project & not have the internet at all. You can add a relay module to control actual electrical appliances like water pumps, geysers, LED bulbs, Fans, etc.

Can I supply 5V to NodeMCU?

NodeMCU Power Supply Use a USB cable with 5V. A diode prevents current from the 5V input to the USB connection flows.

How to program esp01 / 01S relay module tutorial?

In this tutorial, we only used the following materials: and last but not least, ESP01/01S Relay Module. We connect ESP8266 WiFi Serial Transceiver Module to ESP01/01S Relay Module so that we can control the relay via WiFi. To program ESP8266, FTDI Converter is required to be connected with ESP8266.

Is the ESP8266 NodeMCU relay module-control AC appliances?

NO (Normally Open): the normally open configuration works the other way around: there is no connection between the NO and COM pins, so the circuit is broken unless you send a signal from the ESP8266 to close the circuit. The low-voltage side has a set of four pins and a set of three pins.

How to connect NodeMCU digital pin to relay?

Connect NodeMCU Digital pin ( D4) to Input pin of Relay. Download the ” Relay_NodeMCU.ino ” file and open it up in the Arduino IDE. Then Create a new sketch and paste the code below in the Arduino IDE and hit Upload. You can tinker with it if you like based on the application, or just use it as it is.

What does the ESP-01 module do in AP mode?

In AP the Wi-Fi module acts as a Wi-Fi network, or access point (hence the name), allowing other devices to connect to it. This does not mean that you will be able to check your Facebook from your device while the ESP-01 module is operating in the AP mode.

What is the purpose of relay module?

Relays are switches that open and close circuits electromechanically or electronically. Relays control one electrical circuit by opening and closing contacts in another circuit. As relay diagrams show, when a relay contact is normally open (NO), there is an open contact when the relay is not energized.

What is a 4 channel relay module?

The 4 Channel Relay Module is a convenient board which can be used to control high voltage, high current load such as motor, solenoid valves, lamps and AC load. It is designed to interface with microcontroller such as Arduino, PIC and etc. It also comes with a LED to indicate the status of relay.

Can you control a relay with ESP8266 NodeMCU?

Controlling a relay with the ESP8266 is as easy controlling any other output, you just need to send HIGH and LOW signals as you would do to control an LED. You can use our web server examples that control outputs to control relays. You just need to pay attention to the configuration you’re using.

How does the ESP8266 WiFi 5V 1 channel delay module work?

Here we’d like to share how we use the ESP8266 WiFi 5V 1 Channel Relay Delay Module to control our home appliances. This is a WiFi relay module based on the ESP8266 serial module. And it controls the relay working status through the app.

What kind of voltage does the ESP32 relay module control?

It can be controlled with low voltages, like the 3.3V provided by the ESP32 GPIOs and allows us to control high voltages like 12V, 24V or mains voltage (230V in Europe and 120V in the US). There are different relay modules with a different number of channels.

What kind of power source does a NodeMCU use?

Relay are powered with a different power source than NodeMCU. As of now, I am powering the NodeMCU from my laptop and the relay board from a 5-volt battery.