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