Strapping pins are used during power-on/reset to configure the device boot mode, the operating voltage, and other initial settings ( link) Three of the ADC2 pins are strapping pins and thus should be used with caution.ADC2 is used by the Wi-Fi driver, so ADC2 is only usable when the Wi-Fi driver has not started.So, in total, the Huzzah32 has 13 usable analog inputs (A0-A12). The GPIO pins 0, 2, are not exposed on the Huzzah32. Note that GPIO 35, 37, and 38 are not exposed on the Huzzah32. ADC1 has 8 channels attached to GPIO pins 32-39, which translates to A7 (32), A9 (33), A2 (34), A4 (36), and A3 (39) The GPIO pins are in parentheses. Right-click and open image in a new tab to zoom in. The ATmega chips used by the Arduino Uno ( ATmega328) and the Arduino Leonardo ( ATmega32U4) both have 10-bit ADCs, which provide an analog-to-digital resolution of \(2^=4096\)) supporting a total of 18 measurement channels (analog enabled pins). L4: Feature Selection and Hyperparameter Tuning.
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