+-----------------------------+ | Proportional (Kp) | | (Corrects Present Error) | +--------------+--------------+ | v +---------------+ +------+------+ +-------------------+ | Setpoint |-------->| Summation |-------->| System Output | +---------------+ +------+------+ +-------------------+ ^ | +--------------+--------------+ | Integral (Ki) & | | Derivative (Kd) | +-----------------------------+
// Tinkercad PID Position Control for DC Motor double setpoint = 0; // Desired angle (0-1023 from pot) double input = 0; // Actual angle from feedback pot double output = 0; // PWM signal (-255 to 255) sent to motor double lastError = 0; double integral = 0;
This comprehensive guide walks you through the core concepts of PID, how to assemble a test circuit in Tinkercad, and how to write and tune the software loop for perfect stability. Understanding the Anatomy of a PID Controller tinkercad pid control
The encoder provides feedback (actual speed/position) back to the Arduino.
Because Tinkercad’s plant dynamics are reproducible, we can use the : How to Tune Your PID in Tinkercad In
double Kp = 2.0, Ki = 0.5, Kd = 1.0; // These are your "tuning" parameters double setpoint, input, output; double error, lastError, cumError, rateError; void loop() input = readSensor(); // Get current position setpoint = readPotentiometer(); // Get desired position error = setpoint - input; // Calculate the gap cumError += error; // Integral: Sum of errors over time rateError = error - lastError; // Derivative: Change in error // The PID Formula output = (Kp * error) + (Ki * cumError) + (Kd * rateError); driveMotor(output); // Apply the correction lastError = error; // Save for next loop delay(10); Use code with caution. How to Tune Your PID in Tinkercad
In Tinkercad, you can adjust the gains live by adding potentiometers to analog pins and reading them in the loop. This creates a —turn a knob and watch the response change instantly. The Code Logic: The controller calculates the difference
A standard Tinkercad PID setup involves a sensor (like an ultrasonic sensor or encoder) to measure output, an Arduino to process the error, and an actuator (like a DC motor) to adjust based on the PID calculation. The Code Logic: The controller calculates the difference (
Typical starting gains for a DC motor speed loop are:
The PID output u(t) is the sum of three individual terms: