Circuit Documentation

Summary

This circuit is designed to control a 250W 12V DC electric motor using an Arduino Mega 2560 and a BTS7960 motor driver. The circuit includes a power supply, a rocker switch, a resistor, and a diode. The Arduino Mega 2560 is programmed to adjust the motor speed based on temperature readings from an analog sensor.

Component List

POWER SUPPLY 12V 5AMP

• Description: Provides 12V DC power to the circuit.
• Pins:
  • 220V Positive Pole (AC)
  • 220V Negative Pole (AC)
  • GND
  • GND (DC)
  • 12V-24V Output (DC)

Rocker Switch

• Description: Used to control the power supply to the motor driver.
• Pins:
  • Output
  • Input

Resistor

• Description: Limits the current in the circuit.
• Properties:
  • Resistance: 10000 Ohms
• Pins:
  • Pin1
  • Pin2

5408 Diode

• Description: Protects the circuit from reverse voltage.
• Pins:
  • Cathode
  • Anode

Arduino Mega 2560

• Description: Microcontroller used to control the motor driver and read sensor data.
• Pins:
  • IOREF
  • RESET
  • 3V3
  • 5V
  • GND
  • VIN
  • A0 to A15
  • D0 to D53
  • PWM pins
  • AREF
  • SDA
  • SCL

BTS7960 Motor Driver

• Description: Motor driver used to control the 250W 12V DC electric motor.
• Pins:
  • Pin 1 to Pin 12

250W 12V ELECTRIC MOTOR BRUSH MOTOR DC

• Description: The motor being controlled in the circuit.
• Pins:
  • POSITIF
  • NEGATIF

Wiring Details

POWER SUPPLY 12V 5AMP

• GND is connected to:
  • Arduino Mega 2560 (GND)
  • BTS7960 Motor Driver (Pin 1, Pin 12)
  • Resistor (Pin2)
• 12V-24V Output (DC) is connected to:
  • Rocker Switch (Input)

Rocker Switch

• Output is connected to:
  • BTS7960 Motor Driver (Pin 11)
  • Arduino Mega 2560 (VIN)

Resistor

• Pin1 is connected to:
  • BTS7960 Motor Driver (Pin 2, Pin 3, Pin 4, Pin 6, Pin 7)
• Pin2 is connected to:
  • Arduino Mega 2560 (GND)
  • BTS7960 Motor Driver (Pin 1, Pin 12)
  • POWER SUPPLY 12V 5AMP (GND)

5408 Diode

• Cathode and Anode are not connected in the provided net list.

Arduino Mega 2560

• GND is connected to:
  • BTS7960 Motor Driver (Pin 1, Pin 12)
  • Resistor (Pin2)
  • POWER SUPPLY 12V 5AMP (GND)
• 5V is connected to:
  • BTS7960 Motor Driver (Pin 5)
• VIN is connected to:
  • BTS7960 Motor Driver (Pin 11)
  • Rocker Switch (Output)
• D8 PWM is connected to:
  • BTS7960 Motor Driver (Pin 8)

BTS7960 Motor Driver

• Pin 1 is connected to:
  • Arduino Mega 2560 (GND)
  • Resistor (Pin2)
  • POWER SUPPLY 12V 5AMP (GND)
• Pin 2, Pin 3, Pin 4, Pin 6, Pin 7 are connected to:
  • Resistor (Pin1)
• Pin 5 is connected to:
  • Arduino Mega 2560 (5V)
• Pin 8 is connected to:
  • Arduino Mega 2560 (D8 PWM)
• Pin 9 is connected to:
  • 250W 12V ELECTRIC MOTOR BRUSH MOTOR DC (NEGATIF)
• Pin 10 is connected to:
  • 250W 12V ELECTRIC MOTOR BRUSH MOTOR DC (POSITIF)
• Pin 11 is connected to:
  • Arduino Mega 2560 (VIN)
  • Rocker Switch (Output)
• Pin 12 is connected to:
  • Arduino Mega 2560 (GND)
  • Resistor (Pin2)
  • POWER SUPPLY 12V 5AMP (GND)

250W 12V ELECTRIC MOTOR BRUSH MOTOR DC

• POSITIF is connected to:
  • BTS7960 Motor Driver (Pin 10)
• NEGATIF is connected to:
  • BTS7960 Motor Driver (Pin 9)

Code Documentation

Arduino Mega 2560 Code

sketch.ino

void setup() {
  // Set pin D11 (OC1A) as output
  pinMode(11, OUTPUT);

  // Stop Timer1
  TCCR1A = 0;
  TCCR1B = 0;

  // Set Timer1 to Fast PWM mode with ICR1 as top value
  TCCR1A = (1 << WGM11);
  TCCR1B = (1 << WGM13) | (1 << WGM12) | (1 << CS10);

  // Set top value for 20kHz frequency
  ICR1 = 799; // 16MHz / (20kHz * 2) - 1

  // Set initial duty cycle to 50%
  OCR1A = 400; // 50% of 799

  // Enable output on OC1A (pin D11)
  TCCR1A |= (1 << COM1A1);
}

void loop() {
  // Example: Adjust duty cycle based on some condition
  int sensorValue = analogRead(A0);
  float temperatureC = sensorValue * (5.0 / 1023.0) * 100.0; // Convert to Celsius

  // Map the temperature to a PWM duty cycle (0-799)
  int dutyCycle = map(temperatureC, 20, 40, 0, 799); // Adjust the range as needed

  // Constrain the duty cycle to be within 0-799
  dutyCycle = constrain(dutyCycle, 0, 799);

  // Set the new duty cycle
  OCR1A = dutyCycle;

  // Add a delay to avoid rapid changes
  delay(500); // Adjust the delay as needed
}

documentation.txt

#include <TimerOne.h>

This documentation provides a comprehensive overview of the circuit, including a summary, component list, wiring details, and the code used in the Arduino Mega 2560.