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Widok
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01/07/2021 8:38 pm
Topic starter
arduino example
2 Answers
0
01/07/2021 8:40 pm
Topic starter
Lolin32 lite, Pin 34
more info: https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/adc.html
https://demo-dijiudu.readthedocs.io/en/latest/api-reference/peripherals/adc.html
void setup() { adc1_config_width(ADC_WIDTH_12Bit); adc1_config_channel_atten(ADC1_CHANNEL_6, ADC_ATTEN_DB_11); esp_adc_cal_get_characteristics(V_REF, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_12, &characteristics); } void readBattery(){ unsigned int samples = 100; const float rangeFactor = 3300*1.27; float factor = (rangeFactor/4096)*2; uint32_t sum = 0; float voltage = 0.0; float calculated_voltage = 0.0; for (int i = 0; i < samples; i++) { sum += adc1_to_voltage(ADC1_CHANNEL_6, &characteristics); delayMicroseconds(1000); } voltage = sum / (float)samples; calculated_voltage = factor*voltage; Serial2.print("Voltage = "); Serial2.println(calculated_voltage); }
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01/07/2021 9:11 pm
Topic starter
remember about ADC noise.