Circuit Documentation

Summary

This circuit is designed to interface various modules with an ESP32 microcontroller. It includes power management through a step-down module, input/output devices such as a buzzer, relay, and pushbutton, communication modules like GPS and GSM, and a display for user interface. The circuit is powered by a 12v battery, which is stepped down to 5V for the logic level components.

Component List

12v Battery

• Description: Provides the main power source for the circuit.

ESP32 - 38 pins

• Description: A microcontroller with WiFi and Bluetooth capabilities, serving as the central processing unit of the circuit.

Step down Module

• Description: Converts the input voltage to a lower voltage level, stepping down from 24V/12V to 5V.

Terminal PCB 2 Pin

• Description: A simple two-pin terminal for connecting external components like the battery and motor.

1 Channel 5V Relay Module

• Description: An electromechanical switch that allows the ESP32 to control high power devices.

Buzzer Module

• Description: An audio signaling device controlled by the ESP32.

LCD I2C Display

• Description: A display module for showing information, interfaced with the ESP32 via I2C.

Sim800l

• Description: A GSM/GPRS module that allows the circuit to communicate over cellular networks.

GPS NEO 6M

• Description: A GPS module for location tracking, interfaced with the ESP32 via serial communication.

DC Motor

• Description: An electric motor that converts electrical energy into mechanical motion.

Pushbutton

• Description: A simple switch that allows user input to the circuit.

Wiring Details

12v Battery

• - connected to Terminal PCB 2 Pin (Pin B), Step down Module (GND), and DC Motor (pin 2)
• + connected to Terminal PCB 2 Pin (Pin A), Step down Module (12v IN+), and 1 Channel 5V Relay Module (N.O.)

ESP32 - 38 pins

• G35 connected to Buzzer Module (I/O)
• G33 connected to 1 Channel 5V Relay Module (IN)
• CMD connected to Step down Module (5v OUT-) and Buzzer Module (GND)
• 5V connected to LCD I2C Display (VCC), GPS NEO 6M (VCC), Sim800l (VCC), Step down Module (5v OUT+), 1 Channel 5V Relay Module (VCC+), and Buzzer Module (Vcc)
• GND connected to LCD I2C Display (GND), GPS NEO 6M (GND), Sim800l (GND), and 1 Channel 5V Relay Module (VCC- (GND))
• G23 connected to LCD I2C Display (SDA)
• G22 connected to LCD I2C Display (SCL)
• TXD connected to GPS NEO 6M (TX)
• RXD connected to GPS NEO 6M (RX)
• G19 connected to Sim800l (RXD)
• G18 connected to Sim800l (TXD)

Step down Module

• 24v IN+ not connected
• GND connected to 12v Battery (-)
• 12v IN+ connected to 12v Battery (+)
• 5v OUT+ connected to ESP32 (5V), LCD I2C Display (VCC), GPS NEO 6M (VCC), Sim800l (VCC), 1 Channel 5V Relay Module (VCC+), and Buzzer Module (Vcc)
• 5v OUT- connected to ESP32 (CMD) and Buzzer Module (GND)

Terminal PCB 2 Pin

• Pin A connected to 12v Battery (+) and 1 Channel 5V Relay Module (N.O.)
• Pin B connected to 12v Battery (-) and DC Motor (pin 2)

1 Channel 5V Relay Module

• VCC+ connected to Step down Module (5v OUT+)
• VCC- (GND) connected to ESP32 (GND)
• IN connected to ESP32 (G33)
• N.O. connected to 12v Battery (+)
• COM not connected
• N.C. connected to Pushbutton (Pin 2)

Buzzer Module

• GND connected to ESP32 (CMD) and Step down Module (5v OUT-)
• Vcc connected to Step down Module (5v OUT+)
• I/O connected to ESP32 (G35)

LCD I2C Display

• GND connected to ESP32 (GND)
• VCC connected to Step down Module (5v OUT+)
• SDA connected to ESP32 (G23)
• SCL connected to ESP32 (G22)

Sim800l

• NET not connected
• RST not connected
• VCC connected to Step down Module (5v OUT+)
• RXD connected to ESP32 (G19)
• TXD connected to ESP32 (G18)
• GND connected to ESP32 (GND)

GPS NEO 6M

• VCC connected to Step down Module (5v OUT+)
• RX connected to ESP32 (RXD)
• TX connected to ESP32 (TXD)
• GND connected to ESP32 (GND)

DC Motor

• pin 1 connected to Pushbutton (Pin 1)
• pin 2 connected to 12v Battery (-) and Terminal PCB 2 Pin (Pin B)

Pushbutton

• Pin 1 connected to DC Motor (pin 1)
• Pin 2 connected to 1 Channel 5V Relay Module (N.C.)
• Pin 3 not connected
• Pin 4 not connected

Documented Code

sketch.ino

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

documentation.txt

(No additional documentation provided)