ArduRadio Alarm Clock: DIY Arduino-Based FM Radio & Alarm System

About this project

This is the evolution of the "Alarm Clock" (https://create.arduino.cc/projecthub/Tittiamo/alarm-clock-f61bad) with the addition of the radio (TEA 5767)

Navigating the Web I found a beautiful project of an FM radio with Arduino (https://www.instructables.com/id/Make-an-Arduino-FM-Radio-using-TEA5767/#CLPEZERIX0PVJW6), and since I like music I decided to update my "Alarm Clock".

TEA 5767

The "TEA 5767" card, purchased for a few € on Aliexpress, carries out most of the work, is connected to Arduino to pin A4, A5 (protocol I2c) and a Stereo TDA 7297 amplifier.

The TEA 5767 is very small and I had to do a lot of effort to fit a card with a thousand holes

Scheme

I took a lot of inspiration from the project "erik12892" but I also made several changes.

In addition to the P1, P2, P3, P4 buttons on the Alarm Clock, I have added 2 more than I need:

• P5 to change stored stations, I have only entered 4, but you can increase, it by changing the code a bit

• P6 since the TEA 5767 card consumes very little current, has been used to turn the radio on or off via Arduino, in order to use an auxiliary input (mp3, phone, etc.)

To change the radio frequency, use the buttons P2 = More, and P3 = Less.

To stay low with the measurements, I built an Arduino Standalone.

I enclose the electrical diagram, the Fritzing scheme and the PCB drawn in EXCEL.

Construction

As with many of my designs,I used the electrical junction boxes, there are different sizes and shapes, I used a 120 x 80 x 50 mm for the container and two 100 x 100 x 50 mm for the speakers.

The speakers were recovered from an old cathode-ray monitor

The 3 boxes have been joined by cable glands and M3 screws.

Test

Before building the PCB, and putting it all in the box, I did several tests with the prototype chopping board.

Assembling

Three wires were welded to the amplifier to be connected to the TEA 5767 to respective L, R, and GRD

Arduino, TEA5767, Amplifier, Buttons, and Display, everything was assembled as from attached pictures.

As an antenna I used an electric wire up to 30 centimeters

Arduino Code

Code < here > or see below

Libraries:

Wire.h: from Arduino IDE

RTClib.h (https://github.com/adafruit/RTClib)

LiquidCrystal_I2C.h (https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library)

TEA5767Radio.h (https://playground.arduino.cc/Main/TEA5767Radio)

Code

Arduino Code

Schematics