- Solve errata - Secure operation with USB connector supply together with batteries - Batterie low valtuage protection - Audio and vibration motors works with direct USB connector supply - 8x instead of 10x LED-bar - connect vibration motors to GPIO port with default pull-down resistor - optimize for 4xAAA or 3xAA and remove DC-DC converter - FET instead of transistor for backlight control - HAT EEPROM - 3 stage resistor divider 100K (10k+1K) for each ADC input, 1:10 divider - ADC input work with USB connector supply too - Remove the optional big diode
