Circuit Documentation

Summary

This circuit involves an Arduino Nano microcontroller interfacing with a SparkFun Load Cell Amplifier (HX711), a Load Cell, and an MCP2515 CAN controller. The Arduino Nano serves as the central processing unit, reading data from the load cell via the HX711 amplifier and communicating with the CAN bus through the MCP2515.

Component List

Arduino Nano

• Description: A small, complete, and breadboard-friendly board based on the ATmega328P.
• Pins: D1/TX, D0/RX, RESET, GND, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11/MOSI, D12/MISO, VIN, 5V, A7, A6, A5, A4, A3, A2, A1, A0, AREF, 3V3, D13/SCK

Load Cell - Red/white/black/green

• Description: A sensor used to measure weight or force.
• Pins: E+, A-, E-, A+

SparkFun Load Cell Amplifier - HX711

• Description: A small breakout board for the HX711 IC that allows you to easily read load cells to measure weight.
• Pins: VDD, VCC, DAT, SCK, GND, B+, B-, A+, A-, AVDD

MCP2515

• Description: A CAN controller that interfaces with the Arduino Nano to communicate over the CAN bus.
• Pins: INT, SCK, SI, SO, CS, GND, VCC, H, L

Wiring Details

Arduino Nano

• GND: Connected to GND of MCP2515 and GND of SparkFun Load Cell Amplifier (HX711)
• D2: Connected to INT of MCP2515
• D3: Connected to DAT of SparkFun Load Cell Amplifier (HX711)
• D4: Connected to SCK of SparkFun Load Cell Amplifier (HX711)
• D9: Connected to CS of MCP2515
• D11/MOSI: Connected to SI of MCP2515
• D12/MISO: Connected to SO of MCP2515
• 5V: Connected to VCC of MCP2515 and VCC of SparkFun Load Cell Amplifier (HX711)
• D13/SCK: Connected to SCK of MCP2515

Load Cell - Red/white/black/green

• E+: Connected to AVDD of SparkFun Load Cell Amplifier (HX711)
• A-: Connected to A- of SparkFun Load Cell Amplifier (HX711)
• E-: Connected to GND of SparkFun Load Cell Amplifier (HX711)
• A+: Connected to A+ of SparkFun Load Cell Amplifier (HX711)

SparkFun Load Cell Amplifier - HX711

• DAT: Connected to D3 of Arduino Nano
• SCK: Connected to D4 of Arduino Nano
• GND: Connected to GND of Arduino Nano and E- of Load Cell
• VCC: Connected to 5V of Arduino Nano and VCC of MCP2515
• AVDD: Connected to E+ of Load Cell
• A-: Connected to A- of Load Cell
• A+: Connected to A+ of Load Cell

MCP2515

• GND: Connected to GND of Arduino Nano
• INT: Connected to D2 of Arduino Nano
• CS: Connected to D9 of Arduino Nano
• SI: Connected to D11/MOSI of Arduino Nano
• SO: Connected to D12/MISO of Arduino Nano
• VCC: Connected to 5V of Arduino Nano and VCC of SparkFun Load Cell Amplifier (HX711)
• SCK: Connected to D13/SCK of Arduino Nano

Documented Code

Arduino Nano Code (sketch.ino)

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

}

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

}

Documentation (documentation.txt)

This documentation provides a comprehensive overview of the circuit, including a summary, detailed component descriptions, wiring details, and the code used in the Arduino Nano.