ESP32 and Arduino Nano Based LoRa Communication System with OLED Display and Ultrasonic Sensing

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Circuit Documentation

Summary of the Circuit

This circuit integrates various components including microcontrollers, sensors, displays, and communication modules to perform a set of functions. The ESP32 microcontroller serves as the central processing unit, interfacing with a buzzer, an HC-SR04 ultrasonic sensor, an OLED display, and a LoRa communication module. The Arduino Nano is used to interface with another LoRa module and an OLED display. The circuit is powered by a 5V battery and includes a BC547 transistor to control the buzzer. A pushbutton is included for user input, and LEDs are used for visual feedback.

Component List

Microcontrollers

ESP32 (30 pin): A powerful microcontroller with Wi-Fi and Bluetooth capabilities.
Arduino Nano: A compact microcontroller board based on the ATmega328P.

Sensors and Modules

HC-SR04 Ultrasonic Sensor: Measures distance by emitting ultrasonic waves and measuring the time taken for the echo to return.
LoRa Ra-02 SX1278: A long-range communication module based on the SX1278 chip.

Displays

0.96" OLED: A small display for visual output.
128x64 OLED Display (I2C IIC SPI Serial): Another small display that can communicate over I2C or SPI.

Power Sources

5v battery: Provides power to the circuit.

Actuators

buzzer: An audible signaling device.

Passive Components

Resistor: Used to limit current or divide voltages in the circuit.
LED: Two Pin (red): A red light-emitting diode for visual indication.

Other Components

BC547 Transistor: A general-purpose NPN transistor used for switching or amplification.
Pushbutton: A simple switch mechanism for control or input.

Wiring Details

ESP32 (30 pin)

Vin: Connected to the positive terminal of the 5v battery.
GND: Common ground with the HC-SR04 Ultrasonic Sensor, BC547 Transistor, Pushbutton, and 0.96" OLED.
D27: Connected to the TRIG pin of the HC-SR04 Ultrasonic Sensor.
D26: Connected to the ECHO pin of the HC-SR04 Ultrasonic Sensor.
D22: Connected to the SCK pin of the 0.96" OLED.
D21: Connected to the SDA pin of the 0.96" OLED.
D13: Connected to one pin of a Resistor.
D12: Connected to Pin 2 (in) of the Pushbutton.
3V3: Connected to the VDD pin of the 0.96" OLED.

Arduino Nano

VIN: Connected to the 5V pin (power input).
3V3: Connected to the 3.3V pin of the LoRa Ra-02 SX1278.
5V: Connected to the VCC pin of the 128x64 OLED Display and VIN pin (power input).
GND: Common ground with the LoRa Ra-02 SX1278 and 128x64 OLED Display.
A4: Connected to the SDA pin of the 128x64 OLED Display.
A5: Connected to the SCL pin of the 128x64 OLED Display.
D9: Connected to the RST pin of the LoRa Ra-02 SX1278.
D10: Connected to the NSS pin of the LoRa Ra-02 SX1278.
D11/MOSI: Connected to the MOSI pin of the LoRa Ra-02 SX1278.
D12/MISO: Connected to the MISO pin of the LoRa Ra-02 SX1278.

HC-SR04 Ultrasonic Sensor

VCC: Connected to the positive terminal of the 5v battery.
GND: Common ground with the ESP32 (30 pin), BC547 Transistor, Pushbutton, and 0.96" OLED.
TRIG: Connected to the D27 pin of the ESP32 (30 pin).
ECHO: Connected to the D26 pin of the ESP32 (30 pin).

LoRa Ra-02 SX1278

3.3V: Connected to the 3V3 pin of the Arduino Nano.
GND: Common ground with the Arduino Nano.
NSS: Connected to the D10 pin of the Arduino Nano.
MOSI: Connected to the D11/MOSI pin of the Arduino Nano.
MISO: Connected to the D12/MISO pin of the Arduino Nano.
SCK: Connected to the D13/SCK pin of the Arduino Nano.
RST: Connected to the D9 pin of the Arduino Nano.

0.96" OLED

VDD: Connected to the 3V3 pin of the ESP32 (30 pin).
GND: Common ground with the ESP32 (30 pin), HC-SR04 Ultrasonic Sensor, BC547 Transistor, and Pushbutton.
SCK: Connected to the D22 pin of the ESP32 (30 pin).
SDA: Connected to the D21 pin of the ESP32 (30 pin).

128x64 OLED Display (I2C IIC SPI Serial)

VCC: Connected to the 5V pin of the Arduino Nano.
GND: Common ground with the Arduino Nano.
SDA: Connected to the A4 pin of the Arduino Nano.
SCL: Connected to the A5 pin of the Arduino Nano.

BC547 Transistor

Collector: Connected to the PIN pin of the buzzer.
Base: Connected to one pin of a Resistor.
Emitter: Common ground with the ESP32 (30 pin), HC-SR04 Ultrasonic Sensor, Pushbutton, and 0.96" OLED.

Pushbutton

Pin 2 (in): Connected to the D12 pin of the ESP32 (30 pin).
Pin 4 (out): Common ground with the ESP32 (30 pin), HC-SR04 Ultrasonic Sensor, BC547 Transistor, and 0.96" OLED.

Resistor

pin1: Connected to the D13 pin of the ESP32 (30 pin) and the anode pin of the LED.
pin2: Connected to the Base pin of the BC547 Transistor.

LED: Two Pin (red)

cathode: Common ground with the ESP32 (30 pin), HC-SR04 Ultrasonic Sensor, BC547 Transistor, Pushbutton, and 0.96" OLED.
anode: Connected to one pin of a Resistor.

Documented Code

Arduino Nano Code (sketch.ino)

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

}

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

}

Note: The provided code for the Arduino Nano is a template and does not contain any functional code. It needs to be populated with the logic required for the intended operation of the circuit.