● Covered by 1 source · 1 reportLow impact1 neutral
ESP32-based FM Radio Project Moves to Custom PCB Design with Enhanced Components
Key points
- Project transitions from Arduino UNO prototype to ESP32-based custom PCB.
- New design incorporates PAM8403 amplifier, 0.96" OLED, and KY-040 rotary encoder.
- Discovered TEA5767 module should be powered at 3.3V to protect ESP32 data pins.
- The custom PCB will support two 3-Watt, 4-Ohm speakers.
Project Evolution to Custom PCB
The FM radio project, initially prototyped with an Arduino UNO and TEA5767 module, is advancing to a custom-designed PCB. This phase focuses on creating a compact and reproducible device, documenting the design steps in a public repository. The original prototype featured manual and preset FM tuning, a 16x2 LCD for frequency display, and audio output via headphones.
Component Upgrades and Space Optimization
Significant component upgrades are part of the new PCB design. An ESP32 Development Board replaces the Arduino UNO to conserve space. The 16x2 LCD is swapped for a 0.96" OLED display for similar reasons. Audio output is enhanced with a PAM8403 amplifier, which will drive two 3-Watt, 4-Ohm speakers and function as a volume control. A KY-040 rotary encoder will manage both manual and preset frequency adjustments.
Addressing Power Compatibility
During breadboard testing, a critical power compatibility issue was identified. While the TEA5767 module is specified for 5V, it must be powered at 3.3V when used with the ESP32. Connecting the TEA5767 to 5V and its SCL/SDA pins to the ESP32's data pins would expose the ESP32's I/O pins to 5V, risking chip damage, as the ESP32-DevKit-32E manufacturer, Nulllab, specifies a maximum of 3.6V on I/O pins.
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Primary sources
GitHub cmc_internal/api GitHub github/collect GitHub turtushig22-blip/tea5767-radio-tuner GitHub _private/browser GitHub get-started/accessibility GitHub open-source/sponsorsReporting from
A project to build an FM radio using the TEA5767 tuner is progressing to a custom PCB design, replacing an Arduino UNO prototype with an ESP32 development board and integrating improved audio and display components. This update aims to create a more compact and functional device, addressing power compatibility issues discovered during development.