Published April 6, 2019 © CC BY

Use Any Micro-controller as Multitasking

Here I am using Wemos D1 and 4-channel relay. Use as LED.

BeginnerProtip30 minutes683

Use Any Micro-controller as Multitasking

Things used in this project

Hardware components

Wemos D1

4 channel relay

LED (generic)

Jumper wires (generic)

Software apps and online services

Arduino IDE

Story

Here we are using metro library. To make it multitasking.

Library Link : https://github.com/thomasfredericks/Metro-Arduino-Wiring

Here you can use LED as many as you want. I have lack of LED that`s why I am using 4 channel relay to show how this works ?

1. Wemos D1

Features

11 digital input/output pins, all pins have interrupt/pwm/I2C/one-wire supported(except for D0)
1 analog input(3.2V max input)
Micro USB connection
Power jack, 9-24V power input.
Compatible with Arduino
Compatible with nodemcu

Technical Specs

Microcontroller --> ESP-8266EX

Operating Voltage --> 3.3V

Digital I/O Pins --> 11Analog

Input Pins --> 1(Max input: 3.2V)

Clock Speed --> 80MHz/160MHz

Flash --> 4M bytes

Length --> 68.6mm

Width --> 53.4mm

Weight --> 25g

Pins

Pin | Function | ESP-8266

TX | TXD | TXD

RX | RXD | RXD

A0 | Analog input, max 3.3V input | A0

D0 | IO | GPIO16

D1 | IO, SCL | GPIO5

D2 | IO, SDA | GPIO4

D3 | IO, 10k Pull-up | GPIO0

D4 | IO, 10k Pull-up, BUILTIN_LED | GPIO2

D5 | IO, SCK | GPIO14

D6 | IO, MISO | GPIO12

D7 | IO, MOSI | GPIO13

D8 | IO, 10k Pull-down, SS | GPIO15

G | Ground | GND

5V | 5V | -

3V3 | 3.3V | 3.3V

RST | Reset | RST

Here I am just give example. That`s why I am using this relay. You can use LEDs.

2.Relay :

This is a 5V 4-channel relay interface board, and each channel needs a 15-20mA driver current. It can be used to control various appliances and equipment with large current. It is equiped with high-current relays that work under AC250V 10A or DC30V 10A. It has a standard interface that can be controlled directly by microcontroller.

Pin Description

Input:

VCC: Positive supply voltage

GND: Ground

IN1--IN4: Relay control port

Output:

Connect a load, DC 30V/10A，AC 250V/10A

Features：

Size: 75mm (Length) * 55mm (Width) * 19.3mm (Height)
Weight: 61g
PCB Color: Blue
There are four fixed screw holes at each corner of the board, easy for install and fix. The diameter of the hole is 3.1mm
High quality Songle relay is used with single pole double throw, a common terminal, a normally open terminal, and a normally closed terminal
Optical coupling isolation, good anti-interference.
Closed at low level with indicator on, released at high level with indicator off
VCC is system power source, and JD_VCC is relay power source. Ship 5V relay by default. Plug jumper cap to use
The maximum output of the relay: DC 30V/10A, AC 250V/10A

Code

Code

#include <Metro.h> 

const int Pin1 = D7;
const int Pin2 = D6;
const int Pin3 = D5;
const int Pin4 = D4;

boolean State1 = false;
boolean State2 = false;
boolean State3 = false;
boolean State4 = false;

Metro Metro1 = Metro(100);
Metro Metro2 = Metro(100);
Metro Metro3 = Metro(100);
Metro Metro4 = Metro(100);

void setup(){
  pinMode(Pin1 , OUTPUT);
  pinMode(Pin2 , OUTPUT);
  pinMode(Pin3 , OUTPUT);
  pinMode(Pin4 , OUTPUT);
}


void loop(){

  if(Metro1.check()){
    State1 = !State1;
    digitalWrite(Pin1, State1);
  }

  if(Metro2.check()){
    State2 = !State2;
    digitalWrite(Pin2, State2);
  }
  
  if(Metro3.check()){
    State3 = !State3;
    digitalWrite(Pin3, State3);
  }
  
  if(Metro4.check()){
    State4 = !State4;
    digitalWrite(Pin4, State4);
  }
  
}

Credits

Dhrumil Makadia

40 projects • 45 followers

Use Any Micro-controller as Multitasking

Things used in this project

Hardware components

Software apps and online services

Story

1. Wemos D1

Features

Technical Specs

Pins

Pin Description

Input:

Output:

Features：

Schematics

Diagram

Code

Code

Credits

Dhrumil Makadia

Comments

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Use Any Micro-controller as Multitasking

Use Any Micro-controller as Multitasking

Things used in this project

Hardware components

Software apps and online services

Story

1. Wemos D1

Features

Technical Specs

Pins

Pin Description

Input:

Output:

Features：

Schematics

Diagram

Code

Code

Credits

Dhrumil Makadia

Comments

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