Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an Arduino Leonardo microcontroller, various sensors (vibration, ultrasonic), a relay module, an I2C LCD, a buzzer, an LED, a resistor, a 12V battery, a 12V geared motor, a SIM800L module, and step-down buck converters. The circuit is designed to interface these components with the Arduino Leonardo to perform various functions such as sensing vibrations, measuring distances, displaying information, and controlling a motor.

Component List

1. Arduino Leonardo (Rev3b)

   • Description: Microcontroller board based on the ATmega32u4.
   • Pins: D0/RX, D1/TX, D2/SDA, D3 PWM/SCL, D4/A6, D5 PWM, D6 PWM/A7, D7, n.c., IOREF, RESET, 3V3, 5V, GND, VIN, A0, A1, A2, A3, A4, A5, D8/A8, D9 PWM/A9, D10 PWM/A10, D11 PWM, D12/A11, D13 PWM, AREF, SDA, SCL

2. 16x2 I2C LCD

   • Description: 16x2 character LCD display with I2C interface.
   • Pins: GND, VCC, SDA, SCL

3. SW-420 Vibration Sensor

   • Description: Vibration sensor module.
   • Pins: vcc, Ground, Digital output

4. HC-SR04 Ultrasonic Sensor

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

5. Relay module 5v-30v

   • Description: Relay module for switching high voltage devices.
   • Pins: common contact, normally open, normally closed, trigger, V-, V+

6. LED: Two Pin (red)

   • Description: Red LED.
   • Pins: cathode, anode

7. Buzzer

   • Description: Piezoelectric buzzer.
   • Pins: PIN, GND

8. Resistor

   • Description: 200 Ohms resistor.
   • Pins: pin1, pin2

9. 12V Battery

   • Description: 12V power source.
   • Pins: VCC, GND

10. 12V Geared Motor

    • Description: 12V DC motor with gear reduction.
    • Pins: Terminal 1, Terminal 2

11. SIM800L

    • Description: GSM/GPRS module.
    • Pins: NFT, RING, VCC, DTR, RST, MIC +, RXD, MIC-, TXD, SPK+, GND, SPK-

12. Step down Buck converter

    • Description: DC-DC step-down voltage converter.
    • Pins: IN +, IN - GND, OUT +, OUT - GND

Wiring Details

Arduino Leonardo (Rev3b)

• GND connected to:

  • LED: Two Pin (red) (cathode)
  • Relay module 5v-30v (V-)
  • Buzzer (GND)
  • 16x2 I2C LCD (GND)
  • HC-SR04 Ultrasonic Sensor (GND) (all instances)
  • SW-420 Vibration Sensor (Ground)
  • Step down Buck converter (IN - GND)

• D3 PWM/SCL connected to:

  • Resistor (pin2)

• 5V connected to:

  • 16x2 I2C LCD (VCC)
  • HC-SR04 Ultrasonic Sensor (VCC) (all instances)
  • Relay module 5v-30v (V+)
  • Step down Buck converter (IN +)
  • SW-420 Vibration Sensor (vcc)

• D0/RX connected to:

  • SIM800L (TXD)

• D1/TX connected to:

  • SIM800L (RXD)

• D2/SDA connected to:

  • Relay module 5v-30v (trigger)

• D4/A6 connected to:

  • Buzzer (PIN)

• D7 connected to:

  • SW-420 Vibration Sensor (Digital output)

• GND connected to:

  • Step down Buck converter (OUT - GND)

• VIN connected to:

  • Step down Buck converter (OUT +)

• D8/A8 connected to:

  • HC-SR04 Ultrasonic Sensor (TRIG)

• D9 PWM/A9 connected to:

  • HC-SR04 Ultrasonic Sensor (ECHO)

• D10 PWM/A10 connected to:

  • HC-SR04 Ultrasonic Sensor (TRIG)

• D11 PWM connected to:

  • HC-SR04 Ultrasonic Sensor (ECHO)

• D12/A11 connected to:

  • HC-SR04 Ultrasonic Sensor (TRIG)

• D13 PWM connected to:

  • HC-SR04 Ultrasonic Sensor (ECHO)

• SDA connected to:

  • 16x2 I2C LCD (SDA)

• SCL connected to:

  • 16x2 I2C LCD (SCL)

16x2 I2C LCD

• GND connected to:

  • Arduino Leonardo (Rev3b) (GND)

• VCC connected to:

  • Arduino Leonardo (Rev3b) (5V)

• SDA connected to:

  • Arduino Leonardo (Rev3b) (SDA)

• SCL connected to:

  • Arduino Leonardo (Rev3b) (SCL)

SW-420 Vibration Sensor

• vcc connected to:

  • Arduino Leonardo (Rev3b) (5V)

• Ground connected to:

  • Arduino Leonardo (Rev3b) (GND)

• Digital output connected to:

  • Arduino Leonardo (Rev3b) (D7)

HC-SR04 Ultrasonic Sensor

• VCC connected to:

  • Arduino Leonardo (Rev3b) (5V)

• GND connected to:

  • Arduino Leonardo (Rev3b) (GND)

• TRIG connected to:

  • Arduino Leonardo (Rev3b) (D8/A8)
  • Arduino Leonardo (Rev3b) (D10 PWM/A10)
  • Arduino Leonardo (Rev3b) (D12/A11)

• ECHO connected to:

  • Arduino Leonardo (Rev3b) (D9 PWM/A9)
  • Arduino Leonardo (Rev3b) (D11 PWM)
  • Arduino Leonardo (Rev3b) (D13 PWM)

Relay module 5v-30v

• common contact connected to:

  • Step down Buck converter (IN +)

• normally open connected to:

  • 12V Geared Motor (Terminal 1)

• trigger connected to:

  • Arduino Leonardo (Rev3b) (D2/SDA)

• V- connected to:

  • Arduino Leonardo (Rev3b) (GND)

• V+ connected to:

  • Arduino Leonardo (Rev3b) (5V)

LED: Two Pin (red)

• cathode connected to:

  • Arduino Leonardo (Rev3b) (GND)

• anode connected to:

  • Resistor (pin1)

Buzzer

• PIN connected to:

  • Arduino Leonardo (Rev3b) (D4/A6)

• GND connected to:

  • Arduino Leonardo (Rev3b) (GND)

Resistor

• pin1 connected to:

  • LED: Two Pin (red) (anode)

• pin2 connected to:

  • Arduino Leonardo (Rev3b) (D3 PWM/SCL)

12V Battery

• VCC connected to:

  • Step down Buck converter (IN +)

• GND connected to:

  • Step down Buck converter (IN - GND)

12V Geared Motor

• Terminal 1 connected to:

  • Relay module 5v-30v (normally open)

• Terminal 2 connected to:

  • Step down Buck converter (IN - GND)

SIM800L

• TXD connected to:

  • Arduino Leonardo (Rev3b) (D0/RX)

• RXD connected to:

  • Arduino Leonardo (Rev3b) (D1/TX)

• VCC connected to:

  • Step down Buck converter (OUT +)

• GND connected to:

  • Step down Buck converter (OUT - GND)

Step down Buck converter

• IN + connected to:

  • 12V Battery (VCC)

• IN - GND connected to:

  • 12V Battery (GND)

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