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[ESP32 ADC] Add option for raw uncalibrated output (#2663)

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Carlos Garcia Saura 2021-11-10 19:12:57 +01:00 committed by GitHub
parent 2ac232e634
commit 219b225ac0
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 26 additions and 11 deletions
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17
esphome/components/adc/adc_sensor.cpp
View file

@ -91,17 +91,21 @@ void ADCSensor::dump_config() {
float ADCSensor::get_setup_priority() const { return setup_priority::DATA; }
void ADCSensor::update() {
float value_v = this->sample();
ESP_LOGD(TAG, "'%s': Got voltage=%.2fV", this->get_name().c_str(), value_v);
ESP_LOGD(TAG, "'%s': Got voltage=%.4fV", this->get_name().c_str(), value_v);
this->publish_state(value_v);
}
#ifdef USE_ESP8266
float ADCSensor::sample() {
#ifdef USE_ADC_SENSOR_VCC
return ESP.getVcc() / 1024.0f; // NOLINT(readability-static-accessed-through-instance)
int raw = ESP.getVcc(); // NOLINT(readability-static-accessed-through-instance)
#else
return analogRead(this->pin_->get_pin()) / 1024.0f; // NOLINT
int raw = analogRead(this->pin_->get_pin()); // NOLINT
#endif
if (output_raw_) {
return raw;
}
return raw / 1024.0f;
}
#endif
@ -112,6 +116,9 @@ float ADCSensor::sample() {
if (raw == -1) {
return NAN;
}
if (output_raw_) {
return raw;
}
uint32_t mv = esp_adc_cal_raw_to_voltage(raw, &cal_characteristics_[(int) attenuation_]);
return mv / 1000.0f;
}
@ -135,10 +142,6 @@ float ADCSensor::sample() {
if (raw0 == -1 || raw2 == -1 || raw6 == -1 || raw11 == -1) {
return NAN;
}
// prevent divide by zero
if (raw0 == 0 && raw2 == 0 && raw6 == 0 && raw11 == 0) {
return 0;
}
uint32_t mv11 = esp_adc_cal_raw_to_voltage(raw11, &cal_characteristics_[(int) ADC_ATTEN_DB_11]);
uint32_t mv6 = esp_adc_cal_raw_to_voltage(raw6, &cal_characteristics_[(int) ADC_ATTEN_DB_6]);

4
esphome/components/adc/adc_sensor.h
View file

@ -31,6 +31,7 @@ class ADCSensor : public sensor::Sensor, public PollingComponent, public voltage
/// `HARDWARE_LATE` setup priority.
float get_setup_priority() const override;
void set_pin(InternalGPIOPin *pin) { this->pin_ = pin; }
void set_output_raw(bool output_raw) { output_raw_ = output_raw; }
float sample() override;
#ifdef USE_ESP8266
@ -39,8 +40,7 @@ class ADCSensor : public sensor::Sensor, public PollingComponent, public voltage
protected:
InternalGPIOPin *pin_;
uint16_t read_raw_();
uint32_t raw_to_microvolts_(uint16_t raw);
bool output_raw_{false};
#ifdef USE_ESP32
adc_atten_t attenuation_{ADC_ATTEN_DB_0};

16
esphome/components/adc/sensor.py
View file

@ -4,6 +4,7 @@ from esphome import pins
from esphome.components import sensor, voltage_sampler
from esphome.const import (
CONF_ATTENUATION,
CONF_RAW,
CONF_ID,
CONF_INPUT,
CONF_NUMBER,
@ -119,12 +120,18 @@ def validate_adc_pin(value):
raise NotImplementedError
def validate_config(config):
if config[CONF_RAW] and config.get(CONF_ATTENUATION, None) == "auto":
raise cv.Invalid("Automatic attenuation cannot be used when raw output is set.")
return config
adc_ns = cg.esphome_ns.namespace("adc")
ADCSensor = adc_ns.class_(
"ADCSensor", sensor.Sensor, cg.PollingComponent, voltage_sampler.VoltageSampler
)
CONFIG_SCHEMA = (
CONFIG_SCHEMA = cv.All(
sensor.sensor_schema(
unit_of_measurement=UNIT_VOLT,
accuracy_decimals=2,
@ -135,12 +142,14 @@ CONFIG_SCHEMA = (
{
cv.GenerateID(): cv.declare_id(ADCSensor),
cv.Required(CONF_PIN): validate_adc_pin,
cv.Optional(CONF_RAW, default=False): cv.boolean,
cv.SplitDefault(CONF_ATTENUATION, esp32="0db"): cv.All(
cv.only_on_esp32, cv.enum(ATTENUATION_MODES, lower=True)
),
}
)
.extend(cv.polling_component_schema("60s"))
.extend(cv.polling_component_schema("60s")),
validate_config,
)
@ -155,6 +164,9 @@ async def to_code(config):
pin = await cg.gpio_pin_expression(config[CONF_PIN])
cg.add(var.set_pin(pin))
if CONF_RAW in config:
cg.add(var.set_output_raw(config[CONF_RAW]))
if CONF_ATTENUATION in config:
if config[CONF_ATTENUATION] == "auto":
cg.add(var.set_autorange(cg.global_ns.true))