Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an Arduino Mega 2560, load cells, servos, a DS3231 RTC, an ESP32, and a SparkFun Load Cell Amplifier (HX711). The circuit is powered by a 12V battery and a 12V power supply. The Arduino Mega 2560 serves as the main microcontroller, interfacing with various sensors and actuators.

Component List

1. Arduino Mega 2560

   • Description: Main microcontroller
   • Pins: IOREF, RESET, 3V3, 5V, GND, VIN, A0-A15, D0-D53, AREF, SDA, SCL

2. Load Cell - Red/white/black/green

   • Description: Sensor for measuring weight
   • Pins: E+, A-, E-, A+

3. Servo

   • Description: Actuator for precise control of angular position
   • Pins: GND, VCC, PWM

4. DS3231 RTC

   • Description: Real-time clock module
   • Pins: 32K, SQW, SCL, SDA, VCC, GND

5. ESP32

   • Description: Wi-Fi and Bluetooth microcontroller
   • Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, VIN, 3V3, D15, D2, D4, RX2, TX2, D5, D18, D19, D21, RX0, TX0, D22, D23, BOOT

6. SparkFun Load Cell Amplifier - HX711

   • Description: Amplifier for load cell signals
   • Pins: GND, CLK, DAT, VCC, YLW, GRN, WHT, BLK, RED, B-, B+

7. 12V Power Supply

   • Description: Provides 12V power to the circuit
   • Pins: +, -

8. Battery 12V

   • Description: Backup power source
   • Pins: +, -

9. GND

   • Description: Ground connection
   • Pins: GND

Wiring Details

Arduino Mega 2560

• 5V: Connected to VCC of SparkFun Load Cell Amplifier, VCC of DS3231 RTC, VCC of both Servos, and VIN of ESP32.
• GND: Connected to GND of battery, GND of SparkFun Load Cell Amplifier, GND of DS3231 RTC, GND of both Servos, and GND of ESP32.
• VIN: Connected to + of battery.
• A0: Connected to CLK of SparkFun Load Cell Amplifier.
• A1: Connected to DAT of SparkFun Load Cell Amplifier.
• A4: Connected to SDA of DS3231 RTC.
• A5: Connected to SCL of DS3231 RTC.
• D9 PWM: Connected to PWM of both Servos.

Load Cell - Red/white/black/green

• E+: Connected to RED of SparkFun Load Cell Amplifier.
• A-: Connected to WHT of SparkFun Load Cell Amplifier.
• E-: Connected to BLK of SparkFun Load Cell Amplifier.
• A+: Connected to GRN of SparkFun Load Cell Amplifier.

Servo

• GND: Connected to GND of Arduino Mega 2560.
• VCC: Connected to 5V of Arduino Mega 2560.
• PWM: Connected to D9 PWM of Arduino Mega 2560.

DS3231 RTC

• VCC: Connected to 5V of Arduino Mega 2560.
• GND: Connected to GND of Arduino Mega 2560.
• SDA: Connected to A4 of Arduino Mega 2560.
• SCL: Connected to A5 of Arduino Mega 2560.

ESP32

• VIN: Connected to 5V of Arduino Mega 2560.
• 3V3: Connected to 5V of Arduino Mega 2560.
• GND: Connected to GND of Arduino Mega 2560.

SparkFun Load Cell Amplifier - HX711

• VCC: Connected to 5V of Arduino Mega 2560.
• GND: Connected to GND of Arduino Mega 2560.
• CLK: Connected to A0 of Arduino Mega 2560.
• DAT: Connected to A1 of Arduino Mega 2560.
• RED: Connected to E+ of both Load Cells.
• WHT: Connected to A- of both Load Cells.
• BLK: Connected to E- of both Load Cells.
• GRN: Connected to A+ of both Load Cells.

12V Power Supply

• +: Not connected in the provided net list.
• -: Not connected in the provided net list.

Battery 12V

• +: Connected to VIN of Arduino Mega 2560.
• -: Connected to GND of Arduino Mega 2560.

GND

• GND: Connected to GND of battery and GND of Arduino Mega 2560.

Documented Code

Arduino Mega 2560 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 document provides a comprehensive overview of the circuit, including a summary, component list, wiring details, and documented code.