Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes a Raspberry Pi Pico microcontroller as the central processing unit. The circuit is designed to interface with various sensors and actuators, including a photocell (LDR), an HC-SR04 ultrasonic sensor, servo motors, gearmotors, and a motor driver (L298N). Power management is handled by a USB power source, a buck converter, and a DC power source. The Raspberry Pi Pico is programmed to control and interact with these components, as outlined in the embedded code section.

Component List

Raspberry Pi Pico

• Microcontroller board based on the RP2040 microcontroller chip.
• Features multiple GPIO pins for interfacing with various peripherals.

Photocell (LDR)

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

Resistor

• A 200 Ohm resistor used for current limiting or voltage division.
• Typically used in conjunction with sensors like the photocell.

HC-SR04 Ultrasonic Sensor

• An ultrasonic ranging module that provides 2cm to 400cm non-contact measurement functionality.
• Utilizes ultrasonic waves to measure distance to an object.

Gearmotor DC (Motorreductor)

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

Servo

• A rotary actuator or linear actuator that allows for precise control of angular or linear position.
• Commonly used for steering mechanisms or small position control.

USB Power

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

L298N DC Motor Driver

• A motor driver module capable of driving two DC motors or one stepper motor.
• Provides the necessary current and voltage for motor operation.

Buck Converter

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

DC Power Source

• A power supply that provides a DC voltage.
• Used as the main power source for 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 36 connected to HC-SR04 Ultrasonic Sensor (ECHO)
• Pins 35, 34, 33, 32, 31, 30 connected to L298N DC Motor Driver (control signals)
• Pin 14 connected to Photocell (LDR), HC-SR04 Ultrasonic Sensor, L298N DC Motor Driver, and Servo (VCC)
• Pin 16 connected to Resistor, HC-SR04 Ultrasonic Sensor, L298N DC Motor Driver, and Servo (GND)

Photocell (LDR)

• One pin connected to Raspberry Pi Pico (pin 17) and Resistor
• Other pin connected to Raspberry Pi Pico (pin 14) for power

Resistor

• One pin connected to Photocell (LDR)
• Other pin connected to Raspberry Pi Pico (pin 16) for ground

HC-SR04 Ultrasonic Sensor

• TRIG connected to Raspberry Pi Pico (pin 38)
• ECHO connected to Raspberry Pi Pico (pin 36)
• VCC connected to Raspberry Pi Pico (pin 14) for power
• GND connected to Raspberry Pi Pico (pin 16) for ground

Gearmotor DC (Motorreductor)

• Two instances of Gearmotor DC, each connected to two output pins of the L298N DC Motor Driver

Servo

• PWM connected to Raspberry Pi Pico (pin 39)
• VCC connected to Raspberry Pi Pico (pin 14) for power
• GND connected to Raspberry Pi Pico (pin 16) for ground

L298N DC Motor Driver

• Control inputs (IN1, IN2, IN3, IN4, ENA, ENB) connected to Raspberry Pi Pico
• Motor outputs (OUT1, OUT2, OUT3, OUT4) connected to Gearmotor DC
• Power inputs (12V, 5V) connected to Buck Converter and Raspberry Pi Pico
• Ground (GND) connected to Raspberry Pi Pico (pin 16)

Buck Converter

• IN+ and IN- connected to DC Power Source
• OUT+ connected to Raspberry Pi Pico (pin 17) and L298N DC Motor Driver
• OUT- connected to Raspberry Pi Pico (pin 16)

DC Power Source

• Positive connected to Buck Converter (IN+)
• Ground connected to Buck Converter (IN-)

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:

}

Raspberry Pi Pico (documentation.txt)

No additional code documentation provided.