Circuit Documentation

Summary

This document provides a detailed overview of a circuit designed to interface various components with a Raspberry Pi Pico microcontroller. The circuit includes a Peltier Module, an external EEPROM, a mini water pump, an OLED display, MOSFETs, resistors, temperature sensors (DS18B20), a rotary encoder, a 12V PWM fan, and power sources (5V and 12V batteries). The Raspberry Pi Pico controls these components, which are interconnected through a series of electrical nets. The circuit is designed to manage temperature control, data storage, user input, and display information.

Component List

Microcontroller

• Raspberry Pi Pico: A microcontroller board based on the RP2040 microcontroller chip.

Power Sources

• 12V Battery: Provides power to the 12V components in the circuit.
• 5V Battery: Supplies power to the 5V components.

Sensors and Modules

• Peltier Module: A thermoelectric device used for heating or cooling.
• AT24C256 External EEPROM: A memory chip used for storing data.
• DS18B20: A digital temperature sensor.

Actuators

• 5V Mini Water Pump: An actuator for pumping water.
• 12V PWM Fan (120mm): A fan with PWM control for cooling.

Display

• 0.96" OLED: A small display for showing information.

Input Devices

• HW-040 Rotary Encoder: An input device for user interaction.

Discrete Components

• Mosfet: A type of transistor used for switching electronic signals.
• Resistor: A passive two-terminal electrical component that implements electrical resistance.

Wiring Details

Raspberry Pi Pico

• Pin 1: Connected to a 10kΩ resistor.
• Pin 2: Connected to a 10kΩ resistor.
• Pin 5: Connected to a 4.7kΩ resistor.
• Pin 6: Connected to the PWM pin of the 12V PWM Fan.
• Pin 7: Connected to the TACH pin of the 12V PWM Fan.
• Pin 14: Connected to the SCK pin of the 0.96" OLED.
• Pin 16: Connected to the SDA pin of the 0.96" OLED.
• Pin 19: Connected to a 300Ω resistor.
• Pin 20: Connected to a 300Ω resistor.
• Pin 21: Connected to the CLK pin of the HW-040 Rotary Encoder.
• Pin 22: Connected to the DT pin of the HW-040 Rotary Encoder.
• Pin 23: Connected to the ground of the 12V Battery, the source pins of two MOSFETs, and the ground pins of other components.
• Pin 24: Connected to the SW pin of the HW-040 Rotary Encoder.
• Pin 28: Connected to a 10kΩ resistor.
• Pin 33: Connected to a 10kΩ resistor.

Peltier Module

• Negative: Connected to the drain of a MOSFET.
• Positive: Connected to the VCC of the 12V Battery.

AT24C256 External EEPROM

• VCC: Connected to the positive of the 5V Battery.
• SCL: Connected to a 10kΩ resistor.
• SDA: Connected to a 10kΩ resistor.
• GND: Connected to the negative of the 5V Battery.

5V Mini Water Pump

• Positive Pin: Connected to the VCC of the 12V Battery.
• Negative Pin: Connected to the drain of a MOSFET.

0.96" OLED

• GND: Connected to the negative of the 5V Battery.
• VDD: Connected to the positive of the 5V Battery.
• SCK: Connected to Pin 14 of the Raspberry Pi Pico.
• SDA: Connected to Pin 16 of the Raspberry Pi Pico.

Mosfet

• Gate: Connected to a 10kΩ resistor and to the Raspberry Pi Pico for control.
• Drain: Connected to the negative of the Peltier Module and the negative pin of the 5V Mini Water Pump.
• Source: Connected to the ground of the 12V Battery.

Resistor

• Various resistors with values of 300Ω, 4.7kΩ, and 10kΩ are used for pull-ups, pull-downs, and current limiting.

DS18B20

• Signal: Connected to a 4.7kΩ resistor.
• GND: Connected to the negative of the 5V Battery.
• VCC: Connected to the positive of the 5V Battery.

HW-040 Rotary Encoder

• GND: Connected to the negative of the 5V Battery.
• +: Connected to the positive of the 5V Battery.
• SW: Connected to Pin 24 of the Raspberry Pi Pico.
• DT: Connected to Pin 22 of the Raspberry Pi Pico.
• CLK: Connected to Pin 21 of the Raspberry Pi Pico.

12V PWM Fan (120mm)

• GND: Connected to the ground of the 12V Battery.
• +12V: Connected to the VCC of the 12V Battery.
• TACH: Connected to Pin 7 of the Raspberry Pi Pico.
• PWM: Connected to Pin 6 of the Raspberry Pi Pico.

Documented Code

Raspberry Pi Pico Code (sketch.ino)

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

}

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

}

Note: The provided code is a template and does not include specific functionality. It should be populated with the necessary setup and loop code to control the connected components based on the circuit design.