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Support BL0942 calibration (#7299)
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Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
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7 changed files with 115 additions and 3 deletions
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@ -61,7 +61,7 @@ esphome/components/bk72xx/* @kuba2k2
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esphome/components/bl0906/* @athom-tech @jesserockz @tarontop
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esphome/components/bl0939/* @ziceva
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esphome/components/bl0940/* @tobias-
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esphome/components/bl0942/* @dbuezas
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esphome/components/bl0942/* @dbuezas @dwmw2
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esphome/components/ble_client/* @buxtronix @clydebarrow
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esphome/components/bluetooth_proxy/* @jesserockz
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esphome/components/bme280_base/* @esphome/core
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@ -1 +1 @@
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CODEOWNERS = ["@dbuezas"]
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CODEOWNERS = ["@dbuezas", "@dwmw2"]
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@ -122,6 +122,20 @@ void BL0942::update() {
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}
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void BL0942::setup() {
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// If either current or voltage references are set explicitly by the user,
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// calculate the power reference from it unless that is also explicitly set.
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if ((this->current_reference_set_ || this->voltage_reference_set_) && !this->power_reference_set_) {
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this->power_reference_ = (this->voltage_reference_ * this->current_reference_ * 3537.0 / 305978.0) / 73989.0;
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this->power_reference_set_ = true;
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}
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// Similarly for energy reference, if the power reference was set by the user
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// either implicitly or explicitly.
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if (this->power_reference_set_ && !this->energy_reference_set_) {
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this->energy_reference_ = this->power_reference_ * 3600000 / 419430.4;
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this->energy_reference_set_ = true;
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}
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this->write_reg_(BL0942_REG_USR_WRPROT, BL0942_REG_USR_WRPROT_MAGIC);
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this->write_reg_(BL0942_REG_SOFT_RESET, BL0942_REG_SOFT_RESET_MAGIC);
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@ -184,11 +198,15 @@ void BL0942::dump_config() { // NOLINT(readability-function-cognitive-complexit
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ESP_LOGCONFIG(TAG, "BL0942:");
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ESP_LOGCONFIG(TAG, " Address: %d", this->address_);
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ESP_LOGCONFIG(TAG, " Nominal line frequency: %d Hz", this->line_freq_);
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ESP_LOGCONFIG(TAG, " Current reference: %f", this->current_reference_);
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ESP_LOGCONFIG(TAG, " Energy reference: %f", this->energy_reference_);
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ESP_LOGCONFIG(TAG, " Power reference: %f", this->power_reference_);
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ESP_LOGCONFIG(TAG, " Voltage reference: %f", this->voltage_reference_);
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LOG_SENSOR("", "Voltage", this->voltage_sensor_);
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LOG_SENSOR("", "Current", this->current_sensor_);
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LOG_SENSOR("", "Power", this->power_sensor_);
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LOG_SENSOR("", "Energy", this->energy_sensor_);
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LOG_SENSOR("", "frequency", this->frequency_sensor_);
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LOG_SENSOR("", "Frequency", this->frequency_sensor_);
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}
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} // namespace bl0942
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@ -8,6 +8,57 @@
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namespace esphome {
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namespace bl0942 {
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// The BL0942 IC is "calibration-free", which means that it doesn't care
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// at all about calibration, and that's left to software. It measures a
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// voltage differential on its IP/IN pins which linearly proportional to
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// the current flow, and another on its VP pin which is proportional to
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// the line voltage. It never knows the actual calibration; the values
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// it reports are solely in terms of those inputs.
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//
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// The datasheet refers to the input voltages as I(A) and V(V), both
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// in millivolts. It measures them against a reference voltage Vref,
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// which is typically 1.218V (but that absolute value is meaningless
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// without the actual calibration anyway).
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//
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// The reported I_RMS value is 305978 I(A)/Vref, and the reported V_RMS
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// value is 73989 V(V)/Vref. So we can calibrate those by applying a
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// simple meter with a resistive load.
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//
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// The chip also measures the phase difference between voltage and
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// current, and uses it to calculate the power factor (cos φ). It
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// reports the WATT value of 3537 * I_RMS * V_RMS * cos φ).
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//
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// It also integrates total energy based on the WATT value. The time for
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// one CF_CNT pulse is 1638.4*256 / WATT.
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//
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// So... how do we calibrate that?
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//
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// Using a simple resistive load and an external meter, we can measure
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// the true voltage and current for a given V_RMS and I_RMS reading,
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// to calculate BL0942_UREF and BL0942_IREF. Those are in units of
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// "305978 counts per amp" or "73989 counts per volt" respectively.
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//
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// We can derive BL0942_PREF from those. Let's eliminate the weird
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// factors and express the calibration in plain counts per volt/amp:
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// UREF1 = UREF/73989, IREF1 = IREF/305978.
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//
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// Next... the true power in Watts is V * I * cos φ, so that's equal
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// to WATT/3537 * IREF1 * UREF1. Which means
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// BL0942_PREF = BL0942_UREF * BL0942_IREF * 3537 / 305978 / 73989.
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//
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// Finally the accumulated energy. The period of a CF_CNT count is
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// 1638.4*256 / WATT seconds, or 419230.4 / WATT seconds. Which means
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// the energy represented by a CN_CNT pulse is 419230.4 WATT-seconds.
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// Factoring in the calibration, that's 419230.4 / BL0942_PREF actual
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// Watt-seconds (or Joules, as the physicists like to call them).
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//
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// But we're not being physicists today; we we're being engineers, so
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// we want to convert to kWh instead. Which we do by dividing by 1000
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// and then by 3600, so the energy in kWh is
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// CF_CNT * 419230.4 / BL0942_PREF / 3600000
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//
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// Which makes BL0952_EREF = BL0942_PREF * 3600000 / 419430.4
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static const float BL0942_PREF = 596; // taken from tasmota
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static const float BL0942_UREF = 15873.35944299; // should be 73989/1.218
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static const float BL0942_IREF = 251213.46469622; // 305978/1.218
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@ -42,6 +93,22 @@ class BL0942 : public PollingComponent, public uart::UARTDevice {
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void set_frequency_sensor(sensor::Sensor *frequency_sensor) { frequency_sensor_ = frequency_sensor; }
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void set_line_freq(LineFrequency freq) { this->line_freq_ = freq; }
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void set_address(uint8_t address) { this->address_ = address; }
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void set_current_reference(float current_ref) {
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this->current_reference_ = current_ref;
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this->current_reference_set_ = true;
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}
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void set_energy_reference(float energy_ref) {
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this->energy_reference_ = energy_ref;
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this->energy_reference_set_ = true;
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}
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void set_power_reference(float power_ref) {
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this->power_reference_ = power_ref;
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this->power_reference_set_ = true;
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}
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void set_voltage_reference(float voltage_ref) {
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this->voltage_reference_ = voltage_ref;
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this->voltage_reference_set_ = true;
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}
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void loop() override;
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void update() override;
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@ -59,12 +126,16 @@ class BL0942 : public PollingComponent, public uart::UARTDevice {
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// Divide by this to turn into Watt
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float power_reference_ = BL0942_PREF;
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bool power_reference_set_ = false;
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// Divide by this to turn into Volt
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float voltage_reference_ = BL0942_UREF;
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bool voltage_reference_set_ = false;
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// Divide by this to turn into Ampere
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float current_reference_ = BL0942_IREF;
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bool current_reference_set_ = false;
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// Divide by this to turn into kWh
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float energy_reference_ = BL0942_EREF;
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bool energy_reference_set_ = false;
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uint8_t address_ = 0;
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LineFrequency line_freq_ = LINE_FREQUENCY_50HZ;
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uint32_t rx_start_ = 0;
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@ -24,6 +24,11 @@ from esphome.const import (
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UNIT_WATT,
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)
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CONF_CURRENT_REFERENCE = "current_reference"
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CONF_ENERGY_REFERENCE = "energy_reference"
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CONF_POWER_REFERENCE = "power_reference"
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CONF_VOLTAGE_REFERENCE = "voltage_reference"
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DEPENDENCIES = ["uart"]
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bl0942_ns = cg.esphome_ns.namespace("bl0942")
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@ -77,6 +82,10 @@ CONFIG_SCHEMA = (
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),
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),
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cv.Optional(CONF_ADDRESS, default=0): cv.int_range(min=0, max=3),
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cv.Optional(CONF_CURRENT_REFERENCE): cv.float_,
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cv.Optional(CONF_ENERGY_REFERENCE): cv.float_,
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cv.Optional(CONF_POWER_REFERENCE): cv.float_,
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cv.Optional(CONF_VOLTAGE_REFERENCE): cv.float_,
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}
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)
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.extend(cv.polling_component_schema("60s"))
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@ -106,3 +115,11 @@ async def to_code(config):
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cg.add(var.set_frequency_sensor(sens))
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cg.add(var.set_line_freq(config[CONF_LINE_FREQUENCY]))
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cg.add(var.set_address(config[CONF_ADDRESS]))
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if (current_reference := config.get(CONF_CURRENT_REFERENCE, None)) is not None:
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cg.add(var.set_current_reference(current_reference))
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if (voltage_reference := config.get(CONF_VOLTAGE_REFERENCE, None)) is not None:
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cg.add(var.set_voltage_reference(voltage_reference))
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if (power_reference := config.get(CONF_POWER_REFERENCE, None)) is not None:
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cg.add(var.set_power_reference(power_reference))
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if (energy_reference := config.get(CONF_ENERGY_REFERENCE, None)) is not None:
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cg.add(var.set_energy_reference(energy_reference))
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@ -20,3 +20,7 @@ sensor:
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name: BL0942 Energy
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frequency:
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name: BL0942 Frequency
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voltage_reference: 15968
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current_reference: 124180
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power_reference: 309.1
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energy_reference: 2653
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@ -18,3 +18,5 @@ sensor:
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name: BL0942 Energy
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frequency:
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name: BL0942 Frequency
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voltage_reference: 15968
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current_reference: 124180
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