Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an ESP32 CAM microcontroller, a PIR sensor, a momentary switch, a lipo battery charger module, an electrolytic capacitor, an NPN transistor, an MT3608 step-up converter, a yellow LED, and a resistor. The circuit is designed to be powered by a 7.4V battery. The ESP32 CAM is the central processing unit of the circuit, interfacing with the PIR sensor and controlling an LED through a transistor switch. The MT3608 step-up converter is used to regulate the voltage for the circuit, and the lipo battery charger module is included for battery management.

Component List

ESP32 CAM

• Description: A microcontroller module with Wi-Fi and camera capabilities.
• Pins: 5V, GND, GPIO12, GPIO13, GPIO15, GPIO14, GPIO2, GPIO4, 3.3V, GPIO16, GPIO0, 3.3V / 5V / P_OUT, GPIO3 / RX, GPIO1 / TX

7.4V Battery

• Description: A power source for the circuit.
• Pins: +, -

Black Momentary Switch 32 mm

• Description: A switch to control the power flow in the circuit.
• Pins: In, Out

Lipo Battery Charger Module

• Description: A module for charging the lipo battery.
• Pins: B-, B+, OUT-, OUT+

Electrolytic Capacitor

• Description: A capacitor for filtering and stabilizing the voltage.
• Pins: -, +
• Properties: Capacitance - 0.0001 Farads

NPN Transistor (CBE)

• Description: A transistor used as a switch or amplifier.
• Pins: Collector, Base, Emitter

PIR Sensor

• Description: A motion sensor that detects changes in infrared radiation.
• Pins: VDD, SIG, GND

MT3608

• Description: A step-up converter to boost the voltage.
• Pins: VOUT+, VIN+, VOUT-, VIN-

LED: Two Pin (Yellow)

• Description: A yellow light-emitting diode.
• Pins: Cathode, Anode

Resistor

• Description: A component that provides resistance in the circuit.
• Pins: Pin1, Pin2
• Properties: Resistance - 1000 Ohms

Wiring Details

ESP32 CAM

• 5V connected to the positive voltage rail.
• GND connected to the ground rail.
• GPIO13 connected to the collector of the NPN transistor.

7.4V Battery

• • connected to the B+ of the lipo battery charger module.
• • connected to the B- of the lipo battery charger module.

Black Momentary Switch 32 mm

• In connected to the positive voltage rail.
• Out connected to the VOUT+ of the MT3608 and OUT+ of the lipo battery charger module.

Lipo Battery Charger Module

• B- connected to the negative terminal of the 7.4V battery.
• B+ connected to the positive terminal of the 7.4V battery.
• OUT- connected to the VOUT- of the MT3608.
• OUT+ connected to the Out of the momentary switch.

Electrolytic Capacitor

• • connected to the ground rail.
• • connected to the positive voltage rail.

NPN Transistor (CBE)

• Collector connected to GPIO13 of the ESP32 CAM.
• Base connected to the SIG of the PIR sensor.
• Emitter connected to the ground rail.

PIR Sensor

• VDD connected to the positive voltage rail.
• SIG connected to the base of the NPN transistor.
• GND connected to the ground rail.

MT3608

• VOUT+ connected to the Out of the momentary switch and OUT+ of the lipo battery charger module.
• VIN+ connected to the positive voltage rail.
• VOUT- connected to the OUT- of the lipo battery charger module.
• VIN- connected to the ground rail.

LED: Two Pin (Yellow)

• Cathode connected to the ground rail.
• Anode connected to Pin1 of the resistor.

Resistor

• Pin1 connected to the anode of the LED.
• Pin2 connected to the positive voltage rail.

Documented Code

ESP32 CAM 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

• The ESP32 CAM microcontroller is currently programmed with a basic template that includes empty setup and loop functions. The actual functionality needs to be implemented according to the requirements of the application.
• The code for the ESP32 CAM is stored in a file named "sketch.ino".
• There is an additional text file named "documentation.txt" associated with the ESP32 CAM, but it contains no code or text.