Circuit Documentation

Summary

This circuit integrates a Raspberry Pi Pico microcontroller with various sensors and actuators to perform a range of functions. The Raspberry Pi Pico serves as the central processing unit, interfacing with an HC-SR04 Ultrasonic Sensor, a Photocell (LDR) with a resistor for light detection, a servo motor for precise angular movement, and two gearmotors controlled by an L298N DC motor driver. Power management is handled by a USB power source, a DC power source, and a Buck converter to step down voltage as needed. The circuit is designed to interact with the physical environment, likely for automation or robotics applications.

Component List

Raspberry Pi Pico

• Microcontroller board with a wide range of GPIO pins.
• Used as the main processing unit of the circuit.

Photocell (LDR)

• A light-dependent resistor that changes resistance based on light intensity.
• Used for sensing ambient light levels.

Resistor

• A 200 Ohm resistor.
• Used in conjunction with the Photocell (LDR) to form a voltage divider for light level measurement.

HC-SR04 Ultrasonic Sensor

• A sensor that measures distance using ultrasonic waves.
• Used for detecting objects or measuring the distance to them.

Gearmotor DC / Motorreductor

• A DC motor with a gearbox for increased torque.
• Used for driving mechanical parts.

Servo

• A motor capable of precise control of angular position.
• Used for precise positioning tasks.

USB Power

• A power source that provides power through a USB connection.
• Used to power the Raspberry Pi Pico and possibly other components.

L298N DC Motor Driver

• A motor driver capable of controlling up to two DC motors.
• Used for controlling the direction and speed of the gearmotors.

Buck Converter

• A DC-DC converter that steps down voltage.
• Used to provide the appropriate voltage levels to various components from a higher voltage source.

DC Power Source

• A source of DC power.
• Used to supply power to the circuit.

Wiring Details

Raspberry Pi Pico

• pin 39 connected to Servo (PWM signal)
• pin 38 connected to HC-SR04 Ultrasonic Sensor (TRIG)
• pin 17 connected to Photocell (LDR) and Resistor (forming a voltage divider)
• pin 5 connected to Buck converter (power distribution)
• pin 36 connected to HC-SR04 Ultrasonic Sensor (ECHO)
• pin 35, pin 34, pin 33, pin 32, pin 31, pin 30 connected to L298N DC motor driver (motor control signals)

Photocell (LDR)

• One pin connected to Raspberry Pi Pico (for light level measurement)
• Other pin connected to Resistor and power supply via Buck converter

Resistor

• One pin connected to Photocell (LDR)
• Other pin connected to Raspberry Pi Pico (for light level measurement)

HC-SR04 Ultrasonic Sensor

• TRIG pin connected to Raspberry Pi Pico (trigger signal)
• ECHO pin connected to Raspberry Pi Pico (echo signal)
• VCC pin connected to power supply via Buck converter
• GND pin connected to common ground

Gearmotor DC / Motorreductor

• Connected to L298N DC motor driver (motor control)

Servo

• PWM pin connected to Raspberry Pi Pico (control signal)
• VCC pin connected to power supply via Buck converter
• GND pin connected to common ground

L298N DC Motor Driver

• IN1, IN2, IN3, IN4, ENA, ENB pins connected to Raspberry Pi Pico (motor control signals)
• OUT1, OUT2, OUT3, OUT4 pins connected to Gearmotors (motor outputs)
• 12V and 5V pins connected to power supply via Buck converter
• GND pin connected to common ground

Buck Converter

• IN+ and IN- connected to DC Power Source
• OUT+ and OUT- connected to Raspberry Pi Pico and other components requiring power

DC Power Source

• Positive and Ground pins connected to Buck converter (power input)

Documented Code

Raspberry Pi Pico (sketch.ino)

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

Additional Notes

• The provided code for the Raspberry Pi Pico is a template with empty setup and loop functions. Actual implementation code is required for the circuit to perform specific tasks.
• The documentation file for the Raspberry Pi Pico is empty and does not contain additional information.