Tiny FM Radio v1 [Work in progress]

A small battery-powered FM Radio powered by the ATtiny3216 microcontroller. Project sponsored by JLCPCB (https://jlcpcb.com/RAT)

It was originally intented to use the SI4703 FM tuner and some other ICs, but due to some PCB design mistakes and since this was originally a birthday project for my mother and I had to finish it ASAP, I was forced to drop some features for now and integrate in the project an FM tuner kit based on the HEX3653 IC I found at a local electronic components store.

This project's code is using SpenceKonde's megaTinyCore: https://github.com/SpenceKonde/megaTinyCore

Present features

• SH1106 monochrome OLED display (128x64 px, I2C interface)
• TPA2005D1 1.4W audio amplifier fed by a PAM2401 5V/1A boost converter
• 2W / 8Ohm speaker
• 6 tactile buttons (up, down, left, right, ok and power)
• 1200mAh LiPo battery
• MCP73831 500mA LiPo / Li-Ion battery charger IC
• Micro USB port for battery charging
• AP2127K-3.3TRG1 3.3V / 400mA voltage regulator to supply the ICs. Uses the PAM2401 5V supply as input
• ATtiny3216 microcontroller. Features:
  • Controls the HEX3653 FM tuner and the shutdown pins of the TPA2005D1 and PAM2401 ICs via a menu displayed on the OLED
  • Monitors the battery voltage
  • Shuts down the 5V supply when the battery voltage reaches a critical voltage

Planned features (possible after fixing the PCB model)

• SI4703-C19 FM tuner IC featuring volume control, RDS and more (needs external 32.768Khz oscillator)
• Timekeeping using the MCP79402 real-time clock

Here is how the project looks like. Watch video!

This was my first 3D Printed case :)