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+insert-coin
+
+# HW
+CHV32V003 or STM32F0 variant
+
+LM386/SC8002B amplifier
+* HW PWM filtering for audio
+
+
+
+# FW FEATURES
+## DEEP SLEEP
+* wake from deep sleep on rising edge
+* deep sleep when battery voltage is low
+* deep sleep on long button press
+* deep sleep after some long period of time
+    * does not need to be accurate
+    * time domain approx. several hours
+
+## BATTERY VOLTAGE MONITORING
+* ADC battery voltage reading
+
+
+
+## GPIO INPUT
+* 4x switch input
+    * one for button press
+    * one for coin detect
+
+## LED DRIVER
+* 3 channels of LEDs
+    * need PWM-ish dimming but can be rough (bit-banged) 
+
+## AUDIO
+* store audio in MCU flash memory
+* 10 audio files with total of 3-5 seconds of audio time
+* output using PWM channels, will filter in HW