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sigil-03 2025-07-17 21:44:37 -06:00
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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