https://github.com/gavinlyonsrepo/fm_radio_pico
FM Radio Project, RPI PICO RP2040 SDK C++
https://github.com/gavinlyonsrepo/fm_radio_pico
aht10 ch1115 fm-radio fmradio pico pico-sdk radio raspberry-pi raspberry-pi-pico-rp2040 raspberry-pi-pico-sdk raspberry-pico raspberrypi rp2040 rpi rpi-pico sdk tea5767 tea5767hn tea5767n
Last synced: 10 months ago
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FM Radio Project, RPI PICO RP2040 SDK C++
- Host: GitHub
- URL: https://github.com/gavinlyonsrepo/fm_radio_pico
- Owner: gavinlyonsrepo
- License: gpl-3.0
- Created: 2022-12-04T15:48:37.000Z (over 3 years ago)
- Default Branch: main
- Last Pushed: 2024-01-12T00:00:36.000Z (over 2 years ago)
- Last Synced: 2024-11-12T14:15:57.672Z (over 1 year ago)
- Topics: aht10, ch1115, fm-radio, fmradio, pico, pico-sdk, radio, raspberry-pi, raspberry-pi-pico-rp2040, raspberry-pi-pico-sdk, raspberry-pico, raspberrypi, rp2040, rpi, rpi-pico, sdk, tea5767, tea5767hn, tea5767n
- Language: C++
- Homepage:
- Size: 2.29 MB
- Stars: 6
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
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Table of contents
---------------------------
* [Table of contents](#table-of-contents)
* [Overview](#overview)
* [Hardware](#hardware)
* [Software](#software)
* [Schematic](#schematic)
* [Output](#sutput)
Overview
-------------------
* Name: FM_Radio_PICO
* Description: FM stereo radio project for the RPI PICO.
* Developed on and for
1. Raspberry pi PICO RP2040
2. SDK C++ compiler G++ for arm-none-eabi
3. CMAKE , VScode
Hardware
-------------------
The Radio Module used is a TEA5767NH.
Headphones can be connected to the Audio out of the TEA5767 I2C module.
If the user wishes to drive a speaker an Audio amplifier will be required like an LM386 module.
The ADC is used to read the volume control of the Audio Amplifier module thru a voltage divider. Audio amplifier should not be powered at more than 5 volts. This gives us a volume indicator (of the amplified signal).
An OLED CH1115 is used as a screen for output connected by SPI.
Three push buttons are used for control , one more for reset.
1. Mute, select & access setting menu
2. Search up radio band & menus
3. Search down radio band & menus.
An AHT10 12C sensor is read and it's data is displayed at bottom of screen.
As the TEA5767 is a 5 volt logic device(and PICO GPIO is 3.3V) I connect to it through a voltage level shifter circuit. I had to use two separate buses for both I2C devices as they would not work reliably on same bus. The on-board PICO Status LED is also for basic status information.
Software
-------------------
The libraries used are included. They can all also be found in stand alone format on my PICO projects list page [here. ](https://github.com/gavinlyonsrepo/RPI_PICO_projects_list)
Debug information can be printed to serial console (38400 baud) by changing setting.
The TEA5767 also has its own built-in separate debug prompt which can also be enabled
in the library.
On Startup a splash screen is displayed followed by a radio station selection menu. Here the user can select
a radio station from a list by pressing mute button and navigate menu using search buttons.
The settings menu can be accessed by holding down the mute button for longer than 3 seconds
It contains five settings currently , 1&2 define behaviour of search buttons,
3-5 define display mode.
1. Scan search and tune to stations automatically (default)
2. Fine tune search, Each press changes frequency by +/- 50 Khz
3. Display mode default
4. Display Radio info only
5. Display Sensor data only , large text
Schematic
-------------------
1. "VIN" is the AUDIO out to the amplifier circuit for speaker if used.
2. "Audio_ADJ" is from the volume control pot of amplifier circuit.
3. 5V Amplifier circuit not shown (TODO).
Output
------------------------
