Intro
Link to youtube video
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Bill of materials
Prices and links are indicative as you can find "daily deals" and quantity discounts (for further projects or spare parts) with a quick web search:
| Item | Qty | Price (£) | Total (£) | |
|---|---|---|---|---|
| Raspberry Pi Pico H | 1 | 4.80 | 4.80 | Buy it |
| PAM8302A digital-to-analog amplifier | 1 | 3.90 | 3.90 | Buy it |
| 3W 4ohm speaker | 1 | 2.90 | 2.90 | Buy it |
| PN532-based RFID (NFC) reader | 1 | 7.99 | 7.99 | Buy it |
| 720 mAh LiPo battery | 1 | 16.99 | 16.99 | Buy it |
| USB-LiPo charger module | 1 | 5.99 | 5.99 | Buy it |
| LiPo-USB converter module | 1 | 6.49 | 6.49 | Buy it |
| Wires, solder and PLA filament | 0 | 0 | ||
| 49.06 |
Connection diagram
Power consumption
Measured on the Pi's 5V input, the current consumption is about 60 mA when scanning and 100 mA when playing an MP3.
We need to convert the worst case scenario (100 mA) and the battery capacity (720 mAh at 3.7 V) to Watts to make the calculation easier, so 500 mW and 2664 mW respectively.
2664 / 500 = about 5 h 20 min of continuos playback.
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Enclosure
Find the FreeCAD design and STL files in the Gitlab repo: https://www.hadronrider.uk/gitlab/valerio/toysoundmaker/-/tree/main/enclosure?ref_type=heads
Assembly instructions
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Software
Please refer to the Gitlab repo/deployment instructions here: https://www.hadronrider.uk/gitlab/valerio/toysoundmaker#firmware-flashing-and-deployment
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