Circuit Documentation

Summary

This circuit involves an Arduino UNO microcontroller interfacing with three Adafruit MAX31865 RTD Sensor Breakout boards. The Arduino UNO is used to control and read data from the sensor breakouts via SPI communication. The circuit is designed to measure temperature using RTD sensors connected to the MAX31865 boards.

Component List

Arduino UNO

• Description: A microcontroller board based on the ATmega328P.
• Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0

Adafruit MAX31865 RTD Sensor Breakout (3 instances)

• Description: A breakout board for the MAX31865 RTD-to-Digital converter.
• Pins: VIN, GND, 3.3V, SCLK, SDO, SDI, CS, DRDY, FORCE+, RTDIN+, RTDIN-, FORCE-

Wiring Details

Arduino UNO

• D8: Connected to CS of Adafruit MAX31865 RTD Sensor Breakout (Instance 1)
• D9: Connected to CS of Adafruit MAX31865 RTD Sensor Breakout (Instance 2)
• D10: Connected to CS of Adafruit MAX31865 RTD Sensor Breakout (Instance 3)
• D11: Connected to SDI of all Adafruit MAX31865 RTD Sensor Breakouts
• D12: Connected to SDO of all Adafruit MAX31865 RTD Sensor Breakouts
• D13: Connected to SCLK of all Adafruit MAX31865 RTD Sensor Breakouts
• GND: Connected to GND of all Adafruit MAX31865 RTD Sensor Breakouts
• Vin: Connected to VIN of all Adafruit MAX31865 RTD Sensor Breakouts

Adafruit MAX31865 RTD Sensor Breakout (Instance 1)

• CS: Connected to D8 of Arduino UNO
• SDI: Connected to D11 of Arduino UNO
• SDO: Connected to D12 of Arduino UNO
• SCLK: Connected to D13 of Arduino UNO
• GND: Connected to GND of Arduino UNO
• VIN: Connected to Vin of Arduino UNO

Adafruit MAX31865 RTD Sensor Breakout (Instance 2)

• CS: Connected to D9 of Arduino UNO
• SDI: Connected to D11 of Arduino UNO
• SDO: Connected to D12 of Arduino UNO
• SCLK: Connected to D13 of Arduino UNO
• GND: Connected to GND of Arduino UNO
• VIN: Connected to Vin of Arduino UNO

Adafruit MAX31865 RTD Sensor Breakout (Instance 3)

• CS: Connected to D10 of Arduino UNO
• SDI: Connected to D11 of Arduino UNO
• SDO: Connected to D12 of Arduino UNO
• SCLK: Connected to D13 of Arduino UNO
• GND: Connected to GND of Arduino UNO
• VIN: Connected to Vin of Arduino UNO

Code Documentation

Arduino UNO Code

sketch.ino

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

}

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

}

documentation.txt

This document provides a comprehensive overview of the circuit, including a summary, detailed component list, wiring details, and documented code. The Arduino UNO interfaces with three Adafruit MAX31865 RTD Sensor Breakout boards to measure temperature using RTD sensors. The provided code is a basic template for further development.