Circuit Documentation

Summary

This document provides a detailed overview of a circuit designed to interface various components with an Arduino UNO microcontroller. The circuit includes input devices, power management modules, a display, a real-time clock, a servo motor, a relay module, and a water pump. The Arduino UNO serves as the central processing unit, controlling the interactions between the components. The circuit is powered by a solar panel and a 4xAA battery pack through a TP4056 charging module and a 12v to 5v step-down power converter.

Component List

4X4 Membrane Matrix Keypad

• Description: A keypad with 16 buttons arranged in a 4x4 matrix.
• Pins: R1, R2, R3, R4, C1, C2, C3, C4

Servo

• Description: A motor capable of precise position control.
• Pins: GND, VCC, PWM

Solar Panel

• Description: A panel that converts solar energy into electrical power.
• Pins: gnd, vcc

TP4056

• Description: A lithium battery charging module with protection.
• Pins: OUT-, B-, B+, OUT+, IN-, IN+

Water Level Sensor

• Description: A sensor that detects the level of water.
• Pins: SIG, VCC, GND

Arduino UNO

• Description: A microcontroller board based on the ATmega328P.
• Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0-A5, SCL, SDA, AREF, D0-D13

12v to 5v Step Down Power Converter

• Description: A module that steps down voltage from 12v to 5v.
• Pins: VIN 9v-36v, VIN+, VIN-, USB OUTPUT 5V, 5v OUTPUT, GND

4xAA_JST

• Description: A battery holder for four AA batteries with a JST connector.
• Pins: POS, NEG

Water Pump

• Description: A pump used for moving water.
• Pins: VCC, GND

1 Channel 5V Relay Module

• Description: A module that allows control of high power devices with low power signals.
• Pins: VCC+, VCC- (GND), IN, N.O., COM, N.C.

Lcd 20x4 i2c

• Description: A 20x4 character LCD display with an I2C interface.
• Pins: GND, 5v, SCA, SCL

ZS-042 RTC Module

• Description: A real-time clock module with I2C interface.
• Pins: 32K, SQW, SCL, SDA, VCC, GND

Wiring Details

4X4 Membrane Matrix Keypad

• R1 connected to Arduino UNO D9
• R2 connected to Arduino UNO D8
• R3 connected to Arduino UNO D7
• R4 connected to Arduino UNO D6
• C1 connected to Arduino UNO D5
• C2 connected to Arduino UNO D4
• C3 connected to Arduino UNO D3
• C4 connected to Arduino UNO D2

Servo

• GND connected to Arduino UNO GND
• VCC connected to Arduino UNO 5V
• PWM connected to Arduino UNO D12

Solar Panel

• gnd connected to 12v to 5v Step Down Power Converter VIN-
• vcc connected to 12v to 5v Step Down Power Converter VIN+

TP4056

• OUT- connected to Arduino UNO GND
• B- connected to 4xAA_JST NEG
• B+ connected to 4xAA_JST POS
• OUT+ connected to Arduino UNO Vin
• IN- connected to 12v to 5v Step Down Power Converter GND
• IN+ connected to 12v to 5v Step Down Power Converter 5v OUTPUT

Water Level Sensor

• SIG connected to Arduino UNO D13
• VCC connected to Arduino UNO 5V
• GND connected to Arduino UNO GND

12v to 5v Step Down Power Converter

• VIN 9v-36v not connected
• VIN+ connected to Solar Panel vcc
• VIN- connected to Water Pump GND and Solar Panel gnd
• USB OUTPUT 5V not connected
• 5v OUTPUT connected to TP4056 IN+
• GND connected to TP4056 IN-

Water Pump

• VCC connected to 1 Channel 5V Relay Module COM
• GND connected to 12v to 5v Step Down Power Converter VIN-

1 Channel 5V Relay Module

• VCC+ connected to Arduino UNO 5V
• VCC- (GND) connected to Arduino UNO GND
• IN connected to Arduino UNO D1
• N.O. connected to Solar Panel vcc
• COM connected to Water Pump VCC
• N.C. not connected

Lcd 20x4 i2c

• GND connected to Arduino UNO GND
• 5v connected to Arduino UNO 5V
• SCA connected to Arduino UNO A4
• SCL connected to Arduino UNO A5

ZS-042 RTC Module

• 32K not connected
• SQW not connected
• SCL connected to Arduino UNO A5
• SDA connected to Arduino UNO A4
• VCC connected to Arduino UNO 5V
• GND connected to Arduino UNO GND

Documented Code

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:

}

Additional Notes (documentation.txt)

No additional code documentation provided.