How do you control a relay with NodeMCU?

How do you control a relay with NodeMCU?

CIRCUIT CONNECTION

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?

Wiring 8 Channel Relay to ESP8266 NodeMCU For demonstration purposes, we’re controlling 5 relay channels.

How do I control a 5V relay with 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.

What is ESP8266 NodeMCU?

Overview. NodeMCU is an open source firmware for which open source prototyping board designs are available. The firmware is based on the eLua project, and built on the Espressif Non-OS SDK for ESP8266. It uses many open source projects, such as lua-cjson and SPIFFS.

What is Vin pin in NodeMCU?

Power Pins The VIN pin can be used to directly supply the ESP8266 and its peripherals, if you have a regulated 5V voltage source. The 3.3V pins are the output of an on-board voltage regulator. These pins can be used to supply power to external components.

How do I control 5V relay with 3.3 V?

if it were powered with 5 V. The easiest solution is to use a 3.3 V relay. Put an appropriately-valued resistor in series with it to get 3.3 V at the relay. You could also buy a cheap 5 V power supply, and use a transistor (controlled from 3.7 V) to turn on/off the relay.

Which is better Arduino or NodeMCU?

NodeMCU is having 4MBytes of ROM (flash) and UNO is just 32 KB, NodeMCU can store more code compare to UNO. NodeMCU comes with micro USB port and UNO is comes with USB type B connector, micro USB cable is easy available compare to USB type B. NodeMCU development board is smaller in size compared to Arduino UNO.

Can I supply 5V to NodeMCU?

There are four power pins viz. one VIN pin & three 3.3V pins. The VIN pin can be used to directly supply the ESP8266 and its peripherals, if you have a regulated 5V voltage source. These pins can be used to supply power to external components.

How to connect NodeMCU to a relay module?

Connections are very simple, initially you need to power-up the Relay Module. Connect NodeMCU Ground ( GND) pin to -ve pin of Relay. Connect NodeMCU Supply ( 3v3) pin to +ve pin of Relay. Connect NodeMCU Digital pin ( D4) to Input pin of Relay.

What is a relay module?

Generally used relay modules are 5v / 12v. The relay uses an electromagnet to mechanically switch electric appliances. A relay can be operated by a relatively small electric current that can turn ON or OFF a much larger electric current. Using relays is safe as there is no any physical contact between NodeMCU and AC devices.

What is the difference between no and NC in relay?

Relay have two configuration NO ( N ormally O pen) & NC ( N ormally C lose). Relay have coil which is energized by 5v, when coil energized switching action takes place, based on NO-NC configuration. If relay is NO configuration then when coil is energized switching action takes place from NO-NC then load will be connected.

How do I control a relay with the ESP8266?

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 other web server examples that control outputs to control relays. You just need to pay attention to the configuration you’re using.