Circuit Documentation

Summary

This circuit is designed to interface with various components including a microcontroller, power supply, sensors, actuators, and communication modules. The core of the circuit is an Arduino Nano, which controls a pair of solenoids through MOSFETs and reads data from a load cell via an HX711 amplifier. The circuit also includes an SD module for data logging. A pushbutton is used for user input, and resistors are employed for current limiting and pull-up configurations.

Component List

12v Battery

• Description: Provides the main power source for the circuit.

SparkFun Load Cell Amplifier - HX711

• Description: Amplifies the signal from the load cell for the microcontroller to read.

Solenoid (x2)

• Description: Actuators controlled by the microcontroller to perform mechanical actions.

Load Cell - Red/white/black/green

• Description: A sensor that measures force or weight.

SDmodule

• Description: A module for logging data onto an SD card.

Arduino Nano

• Description: A microcontroller board based on the ATmega328P, used as the central controller of the circuit.

Resistor (200 Ohms) (x2)

• Description: Used for current limiting or pull-up/pull-down resistors.

Mosfet (x2)

• Description: Transistors used as switches to control high power devices like solenoids.

Resistor (10k Ohms)

• Description: Typically used as a pull-up resistor.

Red Pushbutton

• Description: A user interface component that can trigger events or actions when pressed.

Wiring Details

12v Battery

• + connected to the Drain of both MOSFETs and VIN of Arduino Nano.
• - connected to GND of SDmodule, HX711, both Solenoids, and Arduino Nano.

SparkFun Load Cell Amplifier - HX711

• GND connected to the 12v Battery -.
• VCC connected to 5V of Arduino Nano.
• DAT connected to D10 of Arduino Nano.
• CLK not connected in the provided net list.
• YLW, GRN, WHT, BLK, RED, B-, B+ are load cell connections and not detailed in the net list.

Solenoid

• pin1 connected to the Source of corresponding MOSFET and GND of the circuit.
• pin2 connected to the Source of corresponding MOSFET.

Load Cell - Red/white/black/green

• E+ connected to RED of HX711.
• A- connected to WHT of HX711.
• E- connected to BLK of HX711.
• A+ connected to GRN of HX711.

SDmodule

• CS connected to D9 of Arduino Nano.
• SCK connected to D13/SCK of Arduino Nano.
• MOSI connected to D11/MOSI of Arduino Nano.
• MISO connected to D12/MISO of Arduino Nano.
• VCC connected to 5V of Arduino Nano.
• GND connected to the 12v Battery -.

Arduino Nano

• VIN connected to the + of the 12v Battery.
• GND connected to the - of the 12v Battery.
• 5V connected to VCC of HX711 and SDmodule.
• D4 connected to one side of the 10k Ohm Resistor and Pin 2 of the Red Pushbutton.
• D5 connected to Gate of one MOSFET through a 200 Ohm Resistor.
• D6 connected to Gate of the other MOSFET through a 200 Ohm Resistor.
• D9, D10, D11/MOSI, D12/MISO, D13/SCK connected to corresponding pins on the SDmodule and HX711.

Resistor (200 Ohms) (x2)

• One side connected to D5 or D6 of Arduino Nano.
• Other side connected to Gate of corresponding MOSFET.

Mosfet (x2)

• Gate connected to D5 or D6 of Arduino Nano through a 200 Ohm Resistor.
• Drain connected to + of the 12v Battery.
• Source connected to pin2 of corresponding Solenoid.

Resistor (10k Ohms)

• One side connected to D4 of Arduino Nano and Pin 2 of the Red Pushbutton.
• Other side connected to GND.

Red Pushbutton

• Pin 2 connected to one side of the 10k Ohm Resistor and D4 of Arduino Nano.
• Pin 4 connected to 5V of Arduino Nano.
• Pin 1 and Pin 3 not connected in the provided net list.

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:

}

Additional Notes (documentation.txt)

No additional code documentation was provided.