Circuit Documentation

Summary

This circuit is a coin counter and heat sealer system. It uses multiple IR sensors to detect different coin denominations, an Arduino UNO to process the inputs, and servos to control a door and a heat sealer. The system also includes an LCD display to show the coin count and a relay to control the heat sealer.

Component List

1. IR Sensor

   • Description: Infrared sensor used to detect coins.
   • Pins: out, gnd, vcc

2. Servo

   • Description: Servo motor used to control the door and heat sealer.
   • Pins: GND, VCC, PWM

3. 5V Relay

   • Description: Relay used to control the heat sealer.
   • Pins: Normally Open, Common terminal, Normally Closed, In, GND, VCC

4. LED Filament 3V

   • Description: LED used for visual indication.
   • Pins: GND, Vcc

5. 16x2 I2C LCD

   • Description: LCD display used to show the coin count.
   • Pins: GND, VCC, SDA, SCL

6. 24/12V Buck Converter

   • Description: Buck converter used to step down voltage.
   • Pins: VIN+, VIN-, 5V, GND

7. 12V Battery

   • Description: Power source for the circuit.
   • Pins: VCC, GND

8. Electrolytic Capacitor

   • Description: Capacitor used for filtering.
   • Pins: -, +
   • Properties: Capacitance: 0.000001 Farads

9. 2.1mm Barrel Jack with Terminal Block

   • Description: Power input connector.
   • Pins: POS, NEG

10. 5A Fuse

    • Description: Fuse for overcurrent protection.
    • Pins: input, output

11. Arduino UNO

    • Description: Microcontroller used to process inputs and control outputs.
    • 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

12. 9V Battery

    • Description: Additional power source.
    • Pins: +, -

Wiring Details

IR Sensor

• gnd connected to:

  • Electrolytic Capacitor (-)
  • 16x2 I2C LCD (GND)
  • Servo (GND)
  • Arduino UNO (GND)
  • 5V Relay (GND)
  • 24/12V Buck (GND)

• vcc connected to:

  • Electrolytic Capacitor (+)
  • 16x2 I2C LCD (VCC)
  • Servo (VCC)
  • 5V Relay (VCC)
  • 24/12V Buck (5V)

• out connected to:

  • Arduino UNO (D2, D3, D4, D5)

Servo

• GND connected to:

  • Electrolytic Capacitor (-)
  • 16x2 I2C LCD (GND)
  • Arduino UNO (GND)
  • 5V Relay (GND)
  • 24/12V Buck (GND)

• VCC connected to:

  • Electrolytic Capacitor (+)
  • 16x2 I2C LCD (VCC)
  • 5V Relay (VCC)
  • 24/12V Buck (5V)

• PWM connected to:

  • Arduino UNO (D6, D7)

5V Relay

• GND connected to:

  • Electrolytic Capacitor (-)
  • 16x2 I2C LCD (GND)
  • Servo (GND)
  • Arduino UNO (GND)
  • 24/12V Buck (GND)

• VCC connected to:

  • Electrolytic Capacitor (+)
  • 16x2 I2C LCD (VCC)
  • Servo (VCC)
  • 24/12V Buck (5V)

• In connected to:

  • Arduino UNO (D8)

• Normally Open connected to:

  • LED Filament 3V (Vcc)

• Common terminal connected to:

  • 9V Battery (+)

LED Filament 3V

• GND connected to:

  • 9V Battery (-)

• Vcc connected to:

  • 5V Relay (Normally Open)

16x2 I2C LCD

• GND connected to:

  • Electrolytic Capacitor (-)
  • Servo (GND)
  • Arduino UNO (GND)
  • 5V Relay (GND)
  • 24/12V Buck (GND)

• VCC connected to:

  • Electrolytic Capacitor (+)
  • Servo (VCC)
  • 5V Relay (VCC)
  • 24/12V Buck (5V)

• SDA connected to:

  • Arduino UNO (A4)

• SCL connected to:

  • Arduino UNO (A5)

24/12V Buck Converter

• VIN+ connected to:

  • 2.1mm Barrel Jack with Terminal Block (POS)
  • 5A Fuse (output)

• VIN- connected to:

  • 2.1mm Barrel Jack with Terminal Block (NEG)
  • 12V Battery (GND)

• 5V connected to:

  • Electrolytic Capacitor (+)
  • 16x2 I2C LCD (VCC)
  • Servo (VCC)
  • 5V Relay (VCC)

• GND connected to:

  • Electrolytic Capacitor (-)
  • 16x2 I2C LCD (GND)
  • Servo (GND)
  • Arduino UNO (GND)
  • 5V Relay (GND)

12V Battery

• VCC connected to:

  • 5A Fuse (input)

• GND connected to:

  • 24/12V Buck (VIN-)

Electrolytic Capacitor

• - connected to:

  • IR Sensor (gnd)
  • 16x2 I2C LCD (GND)
  • Servo (GND)
  • Arduino UNO (GND)
  • 5V Relay (GND)
  • 24/12V Buck (GND)

• + connected to:

  • IR Sensor (vcc)
  • 16x2 I2C LCD (VCC)
  • Servo (VCC)
  • 5V Relay (VCC)
  • 24/12V Buck (5V)

2.1mm Barrel Jack with Terminal Block

• POS connected to:

  • 24/12V Buck (VIN+)
  • 5A Fuse (output)

• NEG connected to:

  • 24/12V Buck (VIN-)
  • 12V Battery (GND)

5A Fuse

• input connected to:

  • 12V Battery (VCC)

• output connected to:

  • 2.1mm Barrel Jack with Terminal Block (POS)
  • 24/12V Buck (VIN+)

Arduino UNO

• GND connected to:

  • Electrolytic Capacitor (-)
  • 16x2 I2C LCD (GND)
  • Servo (GND)
  • 5V Relay (GND)
  • 24/12V Buck (GND)

• A4 connected to:

  • 16x2 I2C LCD (SDA)

• A5 connected to:

  • 16x2 I2C LCD (SCL)

• D2 connected to:

  • IR Sensor (out)

• D3 connected to:

  • IR Sensor (out)

• D4 connected to:

  • IR Sensor (out)

• D5 connected to:

  • IR Sensor (out)

• D6 connected to:

  • Servo (PWM)

• D7 connected to:

  • Servo (PWM)

• D8 connected to:

  • 5V Relay (In)

Code Documentation

#include <Servo.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Define pins for IR sensors
#define IR_1_PIN 2   // 1 Peso coin
#define IR_2_PIN 3   // 5 Peso coin
#define IR_3_PIN 4   // 10 Peso coin
#define IR_4_PIN 5   // 4th sensor for relay and heat sealer