Created
February 14, 2020 10:23
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ESP32 ADC Arduino
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| #include "esp_system.h" | |
| #include "esp_adc_cal.h" | |
| #include "driver/adc.h" | |
| #define ADC_BAT_PIN 34 | |
| #define NO_OF_SAMPLES 64 //Multisampling | |
| #define REF_VOLTAGE 1100 | |
| #define LIN_COEFF_A_SCALE 65536 | |
| #define LIN_COEFF_A_ROUND (LIN_COEFF_A_SCALE/2) | |
| #define ADC_12_BIT_RES 4096 | |
| esp_adc_cal_characteristics_t *adc_chars = new esp_adc_cal_characteristics_t;//adc_chars = calloc(1, sizeof(esp_adc_cal_characteristics_t)); | |
| adc1_channel_t get_adc1_chanel(uint8_t pin) { | |
| adc1_channel_t chan; | |
| switch (pin) { | |
| case 32: | |
| chan = ADC1_CHANNEL_4; | |
| break; | |
| case 33: | |
| chan = ADC1_CHANNEL_5; | |
| break; | |
| case 34: | |
| chan = ADC1_CHANNEL_6; | |
| break; | |
| case 35: | |
| chan = ADC1_CHANNEL_7; | |
| break; | |
| case 36: | |
| chan = ADC1_CHANNEL_0; | |
| break; | |
| case 37: | |
| chan = ADC1_CHANNEL_1; | |
| break; | |
| case 38: | |
| chan = ADC1_CHANNEL_2; | |
| break; | |
| case 39: | |
| chan = ADC1_CHANNEL_3; | |
| break; | |
| } | |
| return chan; | |
| } | |
| double read_bat_adc_idf() { | |
| uint32_t adc_reading = 0; | |
| //Multisampling | |
| for (int i = 0; i < NO_OF_SAMPLES; i++) { | |
| adc_reading += adc1_get_raw((adc1_channel_t)get_adc1_chanel(ADC_BAT_PIN)); | |
| } | |
| adc_reading /= NO_OF_SAMPLES; | |
| //Convert adc_reading to voltage in mV | |
| double voltage = esp_adc_cal_raw_to_voltage(adc_reading, adc_chars); | |
| return voltage; | |
| } | |
| void check_efuse(void) | |
| { | |
| //Check TP is burned into eFuse | |
| if (esp_adc_cal_check_efuse(ESP_ADC_CAL_VAL_EFUSE_TP) == ESP_OK) { | |
| Serial.print("eFuse Two Point: Supported\n"); | |
| } else { | |
| Serial.print("eFuse Two Point: NOT supported\n"); | |
| } | |
| //Check Vref is burned into eFuse | |
| if (esp_adc_cal_check_efuse(ESP_ADC_CAL_VAL_EFUSE_VREF) == ESP_OK) { | |
| Serial.print("eFuse Vref: Supported\n"); | |
| } else { | |
| Serial.print("eFuse Vref: NOT supported\n"); | |
| } | |
| } | |
| void print_char_val_type(esp_adc_cal_value_t val_type) | |
| { | |
| if (val_type == ESP_ADC_CAL_VAL_EFUSE_TP) { | |
| Serial.print("Characterized using Two Point Value\n"); | |
| } else if (val_type == ESP_ADC_CAL_VAL_EFUSE_VREF) { | |
| Serial.print("Characterized using eFuse Vref\n"); | |
| } else { | |
| Serial.print("Characterized using Default Vref\n"); | |
| } | |
| } | |
| void adc_setup() { | |
| adc1_config_width(ADC_WIDTH_12Bit); | |
| adc1_config_channel_atten(get_adc1_chanel(ADC_BAT_PIN), ADC_ATTEN_2_5db ); | |
| esp_adc_cal_value_t val_type = esp_adc_cal_characterize(ADC_UNIT_1, ADC_ATTEN_2_5db, ADC_WIDTH_12Bit, REF_VOLTAGE, adc_chars); | |
| print_char_val_type(val_type); | |
| } | |
| // | |
| void setup() { | |
| Serial.begin(115200); | |
| adc_setup(); | |
| double bat_test = read_bat_adc_idf(); | |
| Serial.print(bat_test); | |
| Serial.println ("mV"); | |
| } | |
| void loop() { | |
| // put your main code here, to run repeatedly: | |
| } |
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