Circuit Documentation

Summary

This circuit involves two Arduino UNO microcontrollers, an HC-SR04 Ultrasonic Sensor, a TDS Sensor, a Water Level Float Switch Sensor, a 16x2 LCD, a Membrane Matrix Keypad, a 1 Channel Relay, and a 5V 8 Channel Relay. The circuit is designed to measure water levels and TDS (Total Dissolved Solids) in a tank, control various relays for water flow, and display information on an LCD. The user can interact with the system using a keypad.

Component List

1. Arduino UNO

   • Description: Microcontroller board based on the ATmega328P.
   • Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0

2. HC-SR04 Ultrasonic Sensor

   • Description: Ultrasonic distance sensor.
   • Pins: VCC, TRIG, ECHO, GND

3. 12V Pneumatic Solenoid Valve

   • Description: Solenoid valve for controlling water flow.
   • Pins: VCC, GND

4. 16x2 LCD

   • Description: 16x2 character LCD display.
   • Pins: VSS, VDD, V0, RS, RW, E, D1, D0, D2, D3, D4, D6, D5, D7, A, K

5. TDS Sensor

   • Description: Sensor for measuring Total Dissolved Solids in water.
   • Pins: P1, P2, +, -, A

6. Water Level Float Switch Sensor

   • Description: Sensor for detecting water level.
   • Pins: Wire2, Wire1

7. 1 Channel Relay 5V

   • Description: Single channel relay module.
   • Pins: VCC, GND, IN, NC, COM, NO

8. 5V 8 Channel Relay

   • Description: 8 channel relay module.
   • Pins: GND, IN1, IN2, IN3, IN4, IN5, IN6, IN7, IN8, VCC, NC, C, NO

9. Membrane Matrix Keypad

   • Description: 4x3 membrane keypad.
   • Pins: Row 1, Row 2, Row 3, Row 4, Column 1, Column 2, Column 3

Wiring Details

Arduino UNO (1)

• 5V: Connected to VCC of HC-SR04 Ultrasonic Sensor and VCC of 5V 8 Channel Relay.
• GND: Connected to GND of 5V 8 Channel Relay, GND of HC-SR04 Ultrasonic Sensor, GND of Water Level Float Switch Sensor, and GND of the second Arduino UNO.
• Vin: Connected to + of TDS Sensor.
• A0: Connected to A of TDS Sensor.
• D13: Connected to Wire1 of Water Level Float Switch Sensor.
• D10: Connected to ECHO of HC-SR04 Ultrasonic Sensor.
• D9: Connected to TRIG of HC-SR04 Ultrasonic Sensor.
• D8: Connected to IN6 of 5V 8 Channel Relay.
• D7: Connected to IN5 of 5V 8 Channel Relay.
• D6: Connected to IN of 1 Channel Relay 5V.
• D5: Connected to IN4 of 5V 8 Channel Relay.
• D4: Connected to IN3 of 5V 8 Channel Relay.
• D3: Connected to IN2 of 5V 8 Channel Relay.
• D2: Connected to IN1 of 5V 8 Channel Relay.
• D1: Connected to D0 of the second Arduino UNO.
• D0: Connected to D1 of the second Arduino UNO.

Arduino UNO (2)

• Vin: Connected to + of TDS Sensor.
• 5V: Connected to VSS of 16x2 LCD.
• GND: Connected to VDD and V0 of 16x2 LCD.
• A0: Connected to Column 1 of Membrane Matrix Keypad.
• A1: Connected to Column 2 of Membrane Matrix Keypad.
• A2: Connected to Column 3 of Membrane Matrix Keypad.
• D11: Connected to D7 of 16x2 LCD.
• D10: Connected to D6 of 16x2 LCD.
• D9: Connected to D5 of 16x2 LCD.
• D8: Connected to D4 of 16x2 LCD.
• D7: Connected to E of 16x2 LCD.
• D6: Connected to RS of 16x2 LCD.
• D5: Connected to Row 4 of Membrane Matrix Keypad.
• D4: Connected to Row 3 of Membrane Matrix Keypad.
• D3: Connected to Row 2 of Membrane Matrix Keypad.
• D2: Connected to Row 1 of Membrane Matrix Keypad.

HC-SR04 Ultrasonic Sensor

• VCC: Connected to 5V of the first Arduino UNO.
• GND: Connected to GND of the first Arduino UNO.
• TRIG: Connected to D9 of the first Arduino UNO.
• ECHO: Connected to D10 of the first Arduino UNO.

12V Pneumatic Solenoid Valve

• VCC: Not connected in the provided net list.
• GND: Not connected in the provided net list.

16x2 LCD

• VSS: Connected to 5V of the second Arduino UNO.
• VDD: Connected to GND of the second Arduino UNO.
• V0: Connected to GND of the second Arduino UNO.
• RS: Connected to D6 of the second Arduino UNO.
• E: Connected to D7 of the second Arduino UNO.
• D4: Connected to D8 of the second Arduino UNO.
• D5: Connected to D9 of the second Arduino UNO.
• D6: Connected to D10 of the second Arduino UNO.
• D7: Connected to D11 of the second Arduino UNO.

TDS Sensor

• +: Connected to Vin of the first and second Arduino UNO.
• -: Connected to GND of HC-SR04 Ultrasonic Sensor.
• A: Connected to A0 of the first Arduino UNO.

Water Level Float Switch Sensor

• Wire2: Connected to GND of the first Arduino UNO.
• Wire1: Connected to D13 of the first Arduino UNO.

1 Channel Relay 5V

• IN: Connected to D6 of the first Arduino UNO.

5V 8 Channel Relay

• VCC: Connected to 5V of the first Arduino UNO.
• GND: Connected to GND of the first Arduino UNO.
• IN1: Connected to D2 of the first Arduino UNO.
• IN2: Connected to D3 of the first Arduino UNO.
• IN3: Connected to D4 of the first Arduino UNO.
• IN4: Connected to D5 of the first Arduino UNO.
• IN5: Connected to D7 of the first Arduino UNO.
• IN6: Connected to D8 of the first Arduino UNO.

Membrane Matrix Keypad

• Row 1: Connected to D2 of the second Arduino UNO.
• Row 2: Connected to D3 of the second Arduino UNO.
• Row 3: Connected to D4 of the second Arduino UNO.
• Row 4: Connected to D5 of the second Arduino UNO.
• Column 1: Connected to A0 of the second Arduino UNO.
• Column 2: Connected to A1 of the second Arduino UNO.
• Column 3: Connected to A2 of the second Arduino UNO.

Code Documentation

Arduino UNO (1)

#define RelayNF 2
#define RelayRO 3
#define RelayPump 4
#define RelayMixing 5
#define RelayUV 6
#define RelayOut 7
#define RelayIn 8
#define trigPin 9
#define echoPin 10
#define floatControllerPin 13

#define TDS_SENSOR_PIN A0
#define VREF 5.0            // ADC reference voltage
#define SCOUNT 30           // Number of sample points for averaging

int analogBuffer[SCOUNT];     // Store analog values from ADC
int analogBufferTemp[SCOUNT]; // Temporary array for median filtering
int analogBufferIndex = 0;
float averageVoltage = 0;
float temperature =