motor-hbridge.md

Motor - H-Bridge

Breadboard for "Motor - H-Bridge"

Fritzing diagram: docs/breadboard/motor-hbridge.fzz

 

Run this example from the command line with:

node eg/motor-hbridge.js

/*
  IMPORTANT!!! This example is not intended for off the shelf H-Bridge 
  based motor controllers. Off the shelf controllers abstract away 
  the need to invert the PWM (AKA Speed) value when the direction pin 
  is set to high. This is for controllers that do not have that feature.
*/

const {Board, Motor} = require("johnny-five");
const board = new Board();

board.on("ready", () => {
  /*
      Motor A
        pwm: 3
        dir: 12
   */

  const motor = new Motor({
    pins: {
      pwm: 3,
      dir: 12
    },
    invertPWM: true
  });

  board.repl.inject({
    motor
  });

  motor.on("start", () => {
    console.log(`start: ${Date.now()}`);
  });

  motor.on("stop", () => {
    console.log(`automated stop on timer: ${Date.now()}`);
  });

  motor.on("forward", () => {
    console.log(`forward: ${Date.now()}`);

    // demonstrate switching to reverse after 5 seconds
    board.wait(5000, () => motor.reverse(255));
  });

  motor.on("reverse", () => {
    console.log(`reverse: ${Date.now()}`);

    // demonstrate stopping after 5 seconds
    board.wait(5000, motor.stop);
  });

  // set the motor going forward full speed
  motor.forward(255);
});

 

License

Copyright (c) 2012-2014 Rick Waldron waldron.rick@gmail.com Licensed under the MIT license. Copyright (c) 2015-2023 The Johnny-Five Contributors Licensed under the MIT license.