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iot-firmware
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build in adc reference table

This commit is contained in:
Siwat Sirichai 2023-10-13 23:10:41 +07:00
parent 5757e93b57
commit 10b55e5aa5
2 changed files with 16 additions and 1 deletions
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16
src/espmega_iot_emon.cpp
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@ -3,8 +3,8 @@
ESPMega_CT::ESPMega_CT(uint8_t analog_pin, float (*adc_to_watts)(uint16_t adc_value), uint32_t fram_address)
{
this->analog_pin = analog_pin;
this->adc_to_watts = adc_to_watts;
this->fram_address = fram_address;
this->adc_to_watts = adc_to_watts;
}
void ESPMega_CT::begin()
@ -37,3 +37,17 @@ float ESPMega_CT::get_power()
{
return this->power;
}
float ESPMega_CT::adc_to_watts_builtin(uint16_t adc_value)
{
const float RATIO = 0.1;
const float BURDEN_RESISTANCE = 20;
const float VOLTAGE = 220;
const uint16_t ADC_RANGE_START = 500;
const uint16_t ADC_RANGE_END = 16000;
const float ADC_RANGE = 12;
float burden_voltage = (adc_value - ADC_RANGE_START) / (ADC_RANGE_END - ADC_RANGE_START) * ADC_RANGE;
float secondary_current = burden_voltage / BURDEN_RESISTANCE;
float primary_current = secondary_current / RATIO;
return primary_current * VOLTAGE;
}

1
src/espmega_iot_emon.hpp
View File

@ -15,4 +15,5 @@ class ESPMega_CT {
float power;
long double energy;
float (*adc_to_watts)(uint16_t adc_value);
float adc_to_watts_builtin(uint16_t adc_value);
};