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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Arduino User Group

Communication

Data Collection

Components and supplies

Breadboard 100x50

10 jumper wires 150mm male

ESP32 CAM

Arduino Uno Rev3

Apps and platforms

Arduino IDE 2.3.4

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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