DC_Motor_Controller

Simple PWM motor controller using customized PCB

Button Press Counter with PWM Output

This project is a button press selector that adjusts a PWM output based on the level. The project uses two buttons to increment the level up or down, and the PWM value is shown by illumiation of the LEDs.

Features

• Counts button presses up and down then displays the count on the serial monitor
• Adjusts PWM output based on the button press count
• Outputs count and PWM value to the serial monitor

Components

• Custom PCB Board and components
• An aruino, mosfet, LED's, resistors, and buttons should work too.
• Connecting wires

Wiring

• See PCB schematic

Code

#include <Arduino.h>
#include <U8x8lib.h>
#include <Wire.h>

#define pwm 6 //2,6,7 worked

U8X8_SSD1306_128X64_NONAME_SW_I2C u8x8(/* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE);   // OLEDs without Reset of the Display

// Counts number of button presses
// output count to serial
// blink a led according to count

byte switchPin = 1;                    // switch is connected to pin 2
//byte ledPin = 13;                      // led on pin 13
byte buttonPresses = 0;                // how many times the button has been pressed 
byte lastPressCount = 0;               // to keep track of last press count

int pwmVal = 0;

void setup() {
  pinMode(switchPin, INPUT);          // Set the switch pin as input
  digitalWrite(switchPin, HIGH);      // set pullup resistor
  Serial.begin(9600);                 // Set up serial communication at 9600bps
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(pwm, OUTPUT); //define pwm
  //screen
  u8x8.begin();
  u8x8.setFlipMode(1);   // set number from 1 to 3, the screen word will rotary 180
}

void loop(){
  u8x8.setFont(u8x8_font_chroma48medium8_r);
  u8x8.setCursor(0, 0);
  u8x8.print("Presses = ");
  u8x8.print(buttonPresses);
  u8x8.setCursor(0,3);
  //u8x8.print("             ");
  u8x8.setCursor(0,3);
  u8x8.print("PWM Val =  ");
  u8x8.print(pwmVal);
  u8x8.print("  ");//removes previous characters that don't get refreshed

  if (digitalRead(switchPin) == LOW)  // check if button was pressed
  {
    buttonPresses++;                  // increment buttonPresses count
    delay(250);                       // debounce switch
  }
  if (buttonPresses == 10) buttonPresses = 0;         // rollover every tenth press
  if (lastPressCount != buttonPresses)              // only do output if the count has changed
  {
    Serial.print ("Button press count = ");          // out to serial
    Serial.println(buttonPresses, DEC);

    if (buttonPresses == 0) pwmVal = 0;
    if (buttonPresses == 1) pwmVal = 100;
    if (buttonPresses == 2) pwmVal = 119;
    if (buttonPresses == 3) pwmVal = 139;
    if (buttonPresses == 4) pwmVal = 158;
    if (buttonPresses == 5) pwmVal = 177;
    if (buttonPresses == 6) pwmVal = 196;
    if (buttonPresses == 7) pwmVal = 216;
    if (buttonPresses == 8) pwmVal = 236;
    if (buttonPresses == 9) pwmVal = 255;

    analogWrite(pwm, pwmVal);
    Serial.print ("PWM VALUE = ");
    Serial.println(pwmVal, DEC);
    
    lastPressCount = buttonPresses;    // track last press count
  }
}