README

README.md

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+# minor-1
+
+Credit card sized capacitive touch toy piano.
+
+Just the absolute minimum:
+
+* QT60140 16 key touch sensor
+* ATtiny1614 microcontroller
+* Piezo transducer
+* MCP6001R op-amp as buffer for the piezo
+* CR2032 coin cell battery
+* SPDT power switch
+* 13 keys, octave +/- and change sound touch buttons
+* Currently unpopulated footprint for NOR flash
+* P-channel MOSFET for completely cutting power
+
+This uses the attiny's 8-bit DAC at 25khz to play notes. The microcontroller can shut down power to the op-amp/piezo and the flash chip when not in use. It also sleeps until a touch button is pressed or until there's activity on the serial port.
+
+There's a simple browser page to log the button presses, read status and read/write the setups. Useful for configurating the touch controller. Could be useful in future for programming the NOR flash or configuring the sounds.
+
+Still very much a work in progress, but it can already play tunes.