DIY FM Radio using RDA5807M & Arduino NANO

 

🔹 Project Overview

This project demonstrates how to build a digital FM radio using the RDA5807M FM receiver module controlled by an Arduino Nano via I2C communication. You can tune FM stations, increase/decrease frequency, and display station info.

---

🔧 Required Components

Component	Quantity
Arduino Nano	1
RDA5807M FM Radio Module	1
Push Buttons (Next / Previous)	2
10kΩ Resistors	2
OLED Display (0.96" I2C) (optional)	1
Breadboard	1
Jumper Wires	As needed
Antenna wire (20–30 cm)	1
USB Cable	1

---

🔌 Pin Connections

🔹 RDA5807M → Arduino Nano

RDA5807M	Arduino Nano
VCC	3.3V
GND	GND
SDA	A4
SCL	A5
ANT	Long wire (antenna)

⚠️ Important: Use 3.3V only. Do NOT connect to 5V.

---

🔹 Buttons Connection

Button	Arduino Pin
Next Station	D2
Previous Station	D3

Use INPUT_PULLUP mode (no external resistor needed).

---

📡 FM Frequency Range

• 87.0 MHz – 108.0 MHz

• Step size: 0.1 MHz

---

💻 Arduino Code (RDA5807M FM Radio)

#include <Wire.h>
#include <RDA5807M.h>

RDA5807M radio;

float frequency = 98.3;   // Start FM frequency

void setup() {
  Wire.begin();
  radio.setup();
  radio.setVolume(8);     // Volume range 0–15
  radio.setFrequency(frequency);

  pinMode(2, INPUT_PULLUP); // Next
  pinMode(3, INPUT_PULLUP); // Previous
}

void loop() {
  if (digitalRead(2) == LOW) {
    frequency += 0.1;
    if (frequency > 108.0) frequency = 87.0;
    radio.setFrequency(frequency);
    delay(300);
  }

  if (digitalRead(3) == LOW) {
    frequency -= 0.1;
    if (frequency < 87.0) frequency = 108.0;
    radio.setFrequency(frequency);
    delay(300);
  }
}

---

📚 Required Library

Install RDA5807M Library from Arduino Library Manager:

• Sketch → Include Library → Manage Libraries

• Search: RDA5807M

---

📸 Project Features

✔ Digital FM Tuning
✔ Compact & Low Power
✔ Arduino Controlled
✔ Can add OLED display
✔ Excellent for IoT & Embedded learning