040 - MicroPython TechNotes: Relay

Jul 7, 2021 · 2 min read · ESP32 ESP8266 MicroPython relay Node MCU ·

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Introduction

In this article, I will discussed about the RELAY with ESP32 using MicroPython.

Pinout

G – for the the ground.
V – for the supply voltage.
S – for the control signal pin.

Bill Of Materials

ESP32 development board.
Gorillacell ESP32 shield.
3-pin F-F Dupont wires.
Gorillacell relay module.

Hardware Instruction

Connect relay G pin to ESP32 GND pin.
Connect relay V pin to ESP32 5V pin.
Connect relay S pin to ESP32 GPIO 23 pin.

Software Instruction

Copy example program in the source code section.
Please feel to modify according to your needs.

Video Demonstration

Call To Action

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– George Bantique | tech.to.tinker@gmail.com

Source Code

1. Example # 1, exploring the basics:

 1# More details can be found in TechToTinker.blogspot.com 
 2# George Bantique | tech.to.tinker@gmail.com
 3
 4from machine import Pin
 5
 6relay = Pin(23, Pin.OUT)
 7
 8
 9# ******************************************************************
10# The following should be explored using the REPL:
11# ******************************************************************
12# # 1. To activate the relay, set signal pin to logic 1
13# relay.value(1)
14
15# # 2. To deactivate the relay, set signal pin to logic 0
16# relay.value(0)

...

2. Example # 2, simple application:

 1# More details can be found in TechToTinker.blogspot.com 
 2# George Bantique | tech.to.tinker@gmail.com
 3
 4from machine import Pin
 5from time import ticks_ms
 6
 7relay = Pin(23, Pin.OUT)
 8sw = Pin(0, Pin.IN)
 9
10isActive = False
11start = ticks_ms()
12
13while True:
14    if ticks_ms()-start>=300:
15        if sw.value()==0:
16            isActive = not isActive
17            relay.value(isActive)
18        start=ticks_ms()