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esp_adc_cal_get_characteristics(V_REF, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_12, &characteristics); but this method assumes you measure the voltage for each board you program and adapt the code accordingly... I was looking for a "software-only" method and reading the VREF with ADC2 seemed a good approach... but I cannot get good.
Analog-to-digital converter (ADC) 0 volts ground. A special ground connection for use with the ADC_VREF pin. 3V3(O) 3.3 volts power. A source of 3.3V power, the same voltage your Pico runs at internally, generated from the VSYS input. 3v3(E) Enables or disables the power. Switch on or off the 3V3(O) power, can also switches your Pico off. VSYS.
2022. 6. 24. · If a known reference voltage is applied to the ADC_VREF pin, the Read_Microvolts function can calculate the Microvolts integer type for you. On the Pico board, this reference is set to 3.3V unless your board has been modified. This is the default value for the VREF parameter.
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