Serial Communication Between Arduino UNO and ESP32-CAM

In this project, we demonstrate UART (Serial) communication between an Arduino UNO and an ESP32-CAM. The Arduino sends data to the ESP32-CAM, and the ESP32-CAM receives and processes that data using hardware serial communication.

Dec 13, 2025

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GPL3+

Arduino User Group

Communication

Data Collection

Devices & Components

Breadboard 100x50

10 jumper wires 150mm male

Arduino Uno Rev3

ESP32 CAM

Software & Tools

Arduino IDE

Project description

Code

ESP32 Code

1#include "HardwareSerial.h"
2
3HardwareSerial SerialESP32(2);
4
5void setup() {
6  Serial.begin(115200);
7  SerialESP32.begin(9600, SERIAL_8N1, 16, 17);
8  Serial.println("ESP32-CAM Ready");
9}
10
11void loop() {
12  if (SerialESP32.available()) {
13    String data = SerialESP32.readStringUntil('\n');
14    Serial.println("Received: " + data);
15  }
16}

#include "HardwareSerial.h"

HardwareSerial SerialESP32(2);

void setup() {
  Serial.begin(115200);
  SerialESP32.begin(9600, SERIAL_8N1, 16, 17);
  Serial.println("ESP32-CAM Ready");
}

void loop() {
  if (SerialESP32.available()) {
    String data = SerialESP32.readStringUntil('\n');
    Serial.println("Received: " + data);
  }
}

Downloadable files

Arduino code

This is Arduino code

arduino_code.ino

ESP32 Code

This is for ESP32

esp.ino

Documentation

How to Exchange Data between Arduino and ESP32 using Serial Communication

https://www.programmingboss.com/2023/01/serial-communication-between-arduino-and-esp32-CAM-UART-data-communication.html

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