Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an Arduino Pro Mini as the central microcontroller, interfaced with an OLED display, a capacitive soil moisture sensor, a toggle switch, a pushbutton, a 7805 voltage regulator, and powered by a 9V battery. The circuit is designed to collect soil moisture data and display it on the OLED screen. User interaction is facilitated through a pushbutton and a toggle switch that controls the power supply.

Component List

Arduino Pro Mini

• Microcontroller board based on the ATmega328
• Pins: DTR, TXO, RXI, VCC, GND, A4, A5, RAW, RESET, A3, A2, A1, A0, SCK, MISO, MOSI, D10, D9, D8, D7, D6, D5, D4, D3, D2

OLED Display (128x32)

• Small OLED screen for displaying data
• Pins: SDA, SCL, VCC, GND

Capacitive Soil Moisture Sensor V1.2

• Sensor for measuring the moisture content in soil
• Pins: GND, VCC, AOUT

Toggle Switch

• Switch to control the power supply to the circuit
• Pins: L1, COM, L2

Pushbutton

• Button for user input
• Pins: Pin 2, Pin 1, Pin 3, Pin 4

7805 Voltage Regulator

• Linear voltage regulator that outputs 5V
• Pins: Vin, Gnd, Vout

9V Battery

• Power source for the circuit
• Pins: -, +

Wiring Details

Arduino Pro Mini

• VCC connected to 7805 Vout
• GND connected to 9V Battery -, Capacitive Soil Moisture Sensor GND, OLED Display GND, and Pushbutton Pin 1
• A4 connected to OLED Display SDA
• A5 connected to OLED Display SCL
• A0 connected to Capacitive Soil Moisture Sensor AOUT
• D6 connected to Pushbutton Pin 4

OLED Display (128x32)

• SDA connected to Arduino Pro Mini A4
• SCL connected to Arduino Pro Mini A5
• VCC connected to Arduino Pro Mini VCC
• GND connected to Arduino Pro Mini GND

Capacitive Soil Moisture Sensor V1.2

• GND connected to Arduino Pro Mini GND
• VCC connected to Arduino Pro Mini VCC
• AOUT connected to Arduino Pro Mini A0

Toggle Switch

• COM connected to 7805 Vin
• L2 connected to 9V Battery +

Pushbutton

• Pin 4 connected to Arduino Pro Mini D6
• Pin 1 connected to Arduino Pro Mini GND

7805 Voltage Regulator

• Vin connected to Toggle Switch COM
• Gnd connected to 9V Battery -
• Vout connected to Arduino Pro Mini VCC

9V Battery

• • connected to Arduino Pro Mini GND and 7805 Gnd
• • connected to Toggle Switch L2

Documented Code

Arduino Pro Mini 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 for the Arduino Pro Mini.