We call this the Adafruit I2S Amp BFF – a “Best Friend Forever”. When you were a kid you may have learned about the “buddy” system, well this product is kinda like that! A board that will watch your QT Py’s back and give it more capabilities.
This PCB is designed to fit onto the back of any QT Py or Xiao board, it can be soldered into place or use pin and socket headers to make it removable. Onboard is a MAX98357 audio amplifier and picoblade-compatible connector for plugging in a 4 or 8 ohm speaker. We use A0 for the audio data, A1 for wordselect clock, and A2 for bitclock. This pinout will work with ESP32 series, nRF52840 and RP2040 chipset boards. It won’t work with the ATSAMD21 ‘original ‘QT Py because those pins on the SAMD21 are not I2S capable. However, you could cut and rewire the traces to connect to the I2S pads if desired – personally we recommend just upgrading to an RP2040 QT Py instead.
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EYE on NPI – Adafruit Daily — EYE on NPI Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey
