FM radio receiver with clock with color display ST7735S.

A radio receiver controlled by a microcontroller is based on module with tuner RDA5807M. It is also possible to use a separate tuner chip

RDA5807FP together with watch quartz without changing the control program microcontroller. A schematic diagram of the radio receiver is given in end of this description. The radio receiver circuit includes a real-time clock module time on the DS3231 chip. The control program ensures the work radio receiver in the radio broadcasting FM range 87 ... 108 MHz and is designed for using an ATmega328 microcontroller, which operates at the frequency of the internal generator 8 MHz. The program is designed to work with a color display ST7735S 1.44 '' having a resolution of 128x128 pixels.

The main functions of the receiver:

 - Scanning and storing stations in non-volatile EEPROM memory.

- Ability to edit the frequencies recorded in the memory, including: change, adding and removing frequencies of receiving channels.

- Enumeration of stations stored in memory up and down the list, as well as autosearch stations up and down the band using CH + or CH-.

- Search for the desired station by its number in the list while holding down the CH + or CH- buttons.

- Identification of the station number by its frequency during autosearch.

- Smooth volume control with V + and V- buttons with mute at "0".

- Turn on / off bass boost via the setup menu.

- Switching the MONO / STEREO playback mode via the setup menu.

- Display of frequency and station numbers.

- Display of the current time.

- Writing the volume and the last tuning frequency to the EEPROM memory.

- When turned on, it starts working at the stored frequency with the previous level volume.

- Indication of the signal level on the display by four bars.

- Indication of the "Mono-Stereo" playback mode both on the display and by the LED.

- Display backlight for 16 seconds when turned on and after pressing any button.

- Optional backlight control button.

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