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TEA5767 Arduino Nano FM Radio Receiver

🧪 PESU Sem 4: Project for Microprocessor and Computer Architecture Course

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👥 Team Members

• Pranav Hemanth – PES1UG23CS433 GitHub
• Nishant Holla – PES1UG23CS401 GitHub
• Nishant Jayaram Hegde – PES1UG23CS400 GitHub

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🎯 Project Overview

This project demonstrates an FM Radio Receiver using the TEA5767 radio module and Arduino Nano. A 1.8" SPI TFT Display (ST7735) is used to show the current frequency, and a potentiometer allows dynamic tuning across the FM band. A 3W speaker connected via an LM386 amplifier outputs the radio audio.

The goal is to build a fully functional standalone FM receiver with minimal components and intuitive controls.

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🖼️ Final Project Build

Here’s how the final assembled project looks:

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✨ Features

• FM radio reception using TEA5767 module
• Real-time frequency display on 1.8” TFT
• Dynamic tuning using a potentiometer
• Audio output via 3W speaker with LM386 amplifier
• Visual feedback on frequency change

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🧩 Modules and Connections

📻 TEA5767 Module (I2C)

Pin	Connection (Arduino Nano)
VCC	5V
GND	GND
SDA	A4
SCL	A5
L/R	LM386 Audio Input

🖥️ 1.8" TFT Display (ST7735)

Pin	Connection (Arduino Nano)
CS	D10
DC	D9
RESET	D8
SDA	D11 (MOSI)
SCK	D13
VCC	5V
GND	GND

🎛️ Potentiometer (Tuning)

Pin	Connection
Center (Wiper)	A0
Sides	5V & GND

🔊 LM386 Amplifier (Audio)

• VCC → 5V
• GND → GND
• Audio In → TEA5767 L/R
• Output → 3W Speaker
• Volume Control Pot between Input & GND

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🧰 Circuit Schematic

Below is the schematic diagram of the FM radio receiver:

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🧠 Code Overview

• Analog input from potentiometer (A0) mapped to frequency range (20.0–180.0 MHz)
• Frequency sent to TEA5767 via I2C
• Display updated only on significant frequency change
• Screen uses Adafruit_GFX + ST7735 libraries
• Frequency is centered using custom printCenter() function

Code: main.ino

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⚙️ Requirements

• Arduino IDE
• Libraries:
  • Adafruit_GFX
  • Adafruit_ST7735
  • Wire
  • TEA5767 Radio Library

Install via Arduino Library Manager or GitHub.

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🚀 Future Enhancements

• 📻 Preset button support
• 💾 EEPROM storage of last frequency
• 🎧 Stereo/mono toggle
• ⏲️ Auto-power down using RTC
• 🔍 Auto-scan & signal strength meter

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🔗 References

• Instructables: Arduino TEA5767 FM Radio
• Adafruit ST7735 Documentation
• TEA5767 Datasheet

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📄 License

MIT License. See LICENSE file for details.