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BH1750 dynamically calculate options (#3214)

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* BH1750 dynamically calculate options

* Fix tests

* Fix NAN

* Convert setup to new-style

* Add myself as codeowner
This commit is contained in:
Otto Winter 2022-02-19 15:49:20 +01:00 committed by GitHub
parent debcaf6fb7
commit 5811389891
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 142 additions and 96 deletions
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1
CODEOWNERS
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@ -28,6 +28,7 @@ esphome/components/atc_mithermometer/* @ahpohl
esphome/components/b_parasite/* @rbaron
esphome/components/ballu/* @bazuchan
esphome/components/bang_bang/* @OttoWinter
esphome/components/bh1750/* @OttoWinter
esphome/components/binary_sensor/* @esphome/core
esphome/components/bl0940/* @tobias-
esphome/components/ble_client/* @buxtronix

184
esphome/components/bh1750/bh1750.cpp
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@ -9,18 +9,109 @@ static const char *const TAG = "bh1750.sensor";
static const uint8_t BH1750_COMMAND_POWER_ON = 0b00000001;
static const uint8_t BH1750_COMMAND_MT_REG_HI = 0b01000000; // last 3 bits
static const uint8_t BH1750_COMMAND_MT_REG_LO = 0b01100000; // last 5 bits
static const uint8_t BH1750_COMMAND_ONE_TIME_L = 0b00100011;
static const uint8_t BH1750_COMMAND_ONE_TIME_H = 0b00100000;
static const uint8_t BH1750_COMMAND_ONE_TIME_H2 = 0b00100001;
/*
bh1750 properties:
L-resolution mode:
- resolution 4lx (@ mtreg=69)
- measurement time: typ=16ms, max=24ms, scaled by MTreg value divided by 69
- formula: counts / 1.2 * (69 / MTreg) lx
H-resolution mode:
- resolution 1lx (@ mtreg=69)
- measurement time: typ=120ms, max=180ms, scaled by MTreg value divided by 69
- formula: counts / 1.2 * (69 / MTreg) lx
H-resolution mode2:
- resolution 0.5lx (@ mtreg=69)
- measurement time: typ=120ms, max=180ms, scaled by MTreg value divided by 69
- formula: counts / 1.2 * (69 / MTreg) / 2 lx
MTreg:
- min=31, default=69, max=254
-> only reason to use l-resolution is faster, but offers no higher range
-> below ~7000lx, makes sense to use H-resolution2 @ MTreg=254
-> try to maximize MTreg to get lowest noise level
*/
void BH1750Sensor::setup() {
ESP_LOGCONFIG(TAG, "Setting up BH1750 '%s'...", this->name_.c_str());
if (!this->write_bytes(BH1750_COMMAND_POWER_ON, nullptr, 0)) {
uint8_t turn_on = BH1750_COMMAND_POWER_ON;
if (this->write(&turn_on, 1) != i2c::ERROR_OK) {
this->mark_failed();
return;
}
}
uint8_t mtreg_hi = (this->measurement_duration_ >> 5) & 0b111;
uint8_t mtreg_lo = (this->measurement_duration_ >> 0) & 0b11111;
this->write_bytes(BH1750_COMMAND_MT_REG_HI | mtreg_hi, nullptr, 0);
this->write_bytes(BH1750_COMMAND_MT_REG_LO | mtreg_lo, nullptr, 0);
void BH1750Sensor::read_lx_(BH1750Mode mode, uint8_t mtreg, const std::function<void(float)> &f) {
// turn on (after one-shot sensor automatically powers down)
uint8_t turn_on = BH1750_COMMAND_POWER_ON;
if (this->write(&turn_on, 1) != i2c::ERROR_OK) {
ESP_LOGW(TAG, "Turning on BH1750 failed");
f(NAN);
return;
}
if (active_mtreg_ != mtreg) {
// set mtreg
uint8_t mtreg_hi = BH1750_COMMAND_MT_REG_HI | ((mtreg >> 5) & 0b111);
uint8_t mtreg_lo = BH1750_COMMAND_MT_REG_LO | ((mtreg >> 0) & 0b11111);
if (this->write(&mtreg_hi, 1) != i2c::ERROR_OK || this->write(&mtreg_lo, 1) != i2c::ERROR_OK) {
ESP_LOGW(TAG, "Setting measurement time for BH1750 failed");
active_mtreg_ = 0;
f(NAN);
return;
}
active_mtreg_ = mtreg;
}
uint8_t cmd;
uint16_t meas_time;
switch (mode) {
case BH1750_MODE_L:
cmd = BH1750_COMMAND_ONE_TIME_L;
meas_time = 24 * mtreg / 69;
break;
case BH1750_MODE_H:
cmd = BH1750_COMMAND_ONE_TIME_H;
meas_time = 180 * mtreg / 69;
break;
case BH1750_MODE_H2:
cmd = BH1750_COMMAND_ONE_TIME_H2;
meas_time = 180 * mtreg / 69;
break;
default:
f(NAN);
return;
}
if (this->write(&cmd, 1) != i2c::ERROR_OK) {
ESP_LOGW(TAG, "Starting measurement for BH1750 failed");
f(NAN);
return;
}
// probably not needed, but adjust for rounding
meas_time++;
this->set_timeout("read", meas_time, [this, mode, mtreg, f]() {
uint16_t raw_value;
if (this->read(reinterpret_cast<uint8_t *>(&raw_value), 2) != i2c::ERROR_OK) {
ESP_LOGW(TAG, "Reading BH1750 data failed");
f(NAN);
return;
}
raw_value = i2c::i2ctohs(raw_value);
float lx = float(raw_value) / 1.2f;
lx *= 69.0f / mtreg;
if (mode == BH1750_MODE_H2)
lx /= 2.0f;
f(lx);
});
}
void BH1750Sensor::dump_config() {
@ -30,64 +121,49 @@ void BH1750Sensor::dump_config() {
ESP_LOGE(TAG, "Communication with BH1750 failed!");
}
const char *resolution_s;
switch (this->resolution_) {
case BH1750_RESOLUTION_0P5_LX:
resolution_s = "0.5";
break;
case BH1750_RESOLUTION_1P0_LX:
resolution_s = "1";
break;
case BH1750_RESOLUTION_4P0_LX:
resolution_s = "4";
break;
default:
resolution_s = "Unknown";
break;
}
ESP_LOGCONFIG(TAG, " Resolution: %s", resolution_s);
LOG_UPDATE_INTERVAL(this);
}
void BH1750Sensor::update() {
if (!this->write_bytes(this->resolution_, nullptr, 0))
return;
// first do a quick measurement in L-mode with full range
// to find right range
this->read_lx_(BH1750_MODE_L, 31, [this](float val) {
if (std::isnan(val)) {
this->status_set_warning();
this->publish_state(NAN);
return;
}
uint32_t wait = 0;
// use max conversion times
switch (this->resolution_) {
case BH1750_RESOLUTION_0P5_LX:
case BH1750_RESOLUTION_1P0_LX:
wait = 180;
break;
case BH1750_RESOLUTION_4P0_LX:
wait = 24;
break;
}
BH1750Mode use_mode;
uint8_t use_mtreg;
if (val <= 7000) {
use_mode = BH1750_MODE_H2;
use_mtreg = 254;
} else {
use_mode = BH1750_MODE_H;
// lx = counts / 1.2 * (69 / mtreg)
// -> mtreg = counts / 1.2 * (69 / lx)
// calculate for counts=50000 (allow some range to not saturate, but maximize mtreg)
// -> mtreg = 50000*(10/12)*(69/lx)
int ideal_mtreg = 50000 * 10 * 69 / (12 * (int) val);
use_mtreg = std::min(254, std::max(31, ideal_mtreg));
}
ESP_LOGV(TAG, "L result: %f -> Calculated mode=%d, mtreg=%d", val, (int) use_mode, use_mtreg);
this->set_timeout("illuminance", wait, [this]() { this->read_data_(); });
this->read_lx_(use_mode, use_mtreg, [this](float val) {
if (std::isnan(val)) {
this->status_set_warning();
this->publish_state(NAN);
return;
}
ESP_LOGD(TAG, "'%s': Got illuminance=%.1flx", this->get_name().c_str(), val);
this->status_clear_warning();
this->publish_state(val);
});
});
}
float BH1750Sensor::get_setup_priority() const { return setup_priority::DATA; }
void BH1750Sensor::read_data_() {
uint16_t raw_value;
if (this->read(reinterpret_cast<uint8_t *>(&raw_value), 2) != i2c::ERROR_OK) {
this->status_set_warning();
return;
}
raw_value = i2c::i2ctohs(raw_value);
float lx = float(raw_value) / 1.2f;
lx *= 69.0f / this->measurement_duration_;
if (this->resolution_ == BH1750_RESOLUTION_0P5_LX) {
lx /= 2.0f;
}
ESP_LOGD(TAG, "'%s': Got illuminance=%.1flx", this->get_name().c_str(), lx);
this->publish_state(lx);
this->status_clear_warning();
}
void BH1750Sensor::set_resolution(BH1750Resolution resolution) { this->resolution_ = resolution; }
} // namespace bh1750
} // namespace esphome

27
esphome/components/bh1750/bh1750.h
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@ -7,29 +7,15 @@
namespace esphome {
namespace bh1750 {
/// Enum listing all resolutions that can be used with the BH1750
enum BH1750Resolution {
BH1750_RESOLUTION_4P0_LX = 0b00100011, // one-time low resolution mode
BH1750_RESOLUTION_1P0_LX = 0b00100000, // one-time high resolution mode 1
BH1750_RESOLUTION_0P5_LX = 0b00100001, // one-time high resolution mode 2
enum BH1750Mode {
BH1750_MODE_L,
BH1750_MODE_H,
BH1750_MODE_H2,
};
/// This class implements support for the i2c-based BH1750 ambient light sensor.
class BH1750Sensor : public sensor::Sensor, public PollingComponent, public i2c::I2CDevice {
public:
/** Set the resolution of this sensor.
*
* Possible values are:
*
* - `BH1750_RESOLUTION_4P0_LX`
* - `BH1750_RESOLUTION_1P0_LX`
* - `BH1750_RESOLUTION_0P5_LX` (default)
*
* @param resolution The new resolution of the sensor.
*/
void set_resolution(BH1750Resolution resolution);
void set_measurement_duration(uint8_t measurement_duration) { measurement_duration_ = measurement_duration; }
// ========== INTERNAL METHODS ==========
// (In most use cases you won't need these)
void setup() override;
@ -38,10 +24,9 @@ class BH1750Sensor : public sensor::Sensor, public PollingComponent, public i2c:
float get_setup_priority() const override;
protected:
void read_data_();
void read_lx_(BH1750Mode mode, uint8_t mtreg, const std::function<void(float)> &f);
BH1750Resolution resolution_{BH1750_RESOLUTION_0P5_LX};
uint8_t measurement_duration_;
uint8_t active_mtreg_{0};
};
} // namespace bh1750

24
esphome/components/bh1750/sensor.py
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@ -2,28 +2,20 @@ import esphome.codegen as cg
import esphome.config_validation as cv
from esphome.components import i2c, sensor
from esphome.const import (
CONF_RESOLUTION,
DEVICE_CLASS_ILLUMINANCE,
STATE_CLASS_MEASUREMENT,
UNIT_LUX,
CONF_MEASUREMENT_DURATION,
)
DEPENDENCIES = ["i2c"]
CODEOWNERS = ["@OttoWinter"]
bh1750_ns = cg.esphome_ns.namespace("bh1750")
BH1750Resolution = bh1750_ns.enum("BH1750Resolution")
BH1750_RESOLUTIONS = {
4.0: BH1750Resolution.BH1750_RESOLUTION_4P0_LX,
1.0: BH1750Resolution.BH1750_RESOLUTION_1P0_LX,
0.5: BH1750Resolution.BH1750_RESOLUTION_0P5_LX,
}
BH1750Sensor = bh1750_ns.class_(
"BH1750Sensor", sensor.Sensor, cg.PollingComponent, i2c.I2CDevice
)
CONF_MEASUREMENT_TIME = "measurement_time"
CONFIG_SCHEMA = (
sensor.sensor_schema(
BH1750Sensor,
@ -34,14 +26,11 @@ CONFIG_SCHEMA = (
)
.extend(
{
cv.Optional(CONF_RESOLUTION, default=0.5): cv.enum(
BH1750_RESOLUTIONS, float=True
cv.Optional("resolution"): cv.invalid(
"The 'resolution' option has been removed. The optimal value is now dynamically calculated."
),
cv.Optional(CONF_MEASUREMENT_DURATION, default=69): cv.int_range(
min=31, max=254
),
cv.Optional(CONF_MEASUREMENT_TIME): cv.invalid(
"The 'measurement_time' option has been replaced with 'measurement_duration' in 1.18.0"
cv.Optional("measurement_duration"): cv.invalid(
"The 'measurement_duration' option has been removed. The optimal value is now dynamically calculated."
),
}
)
@ -54,6 +43,3 @@ async def to_code(config):
var = await sensor.new_sensor(config)
await cg.register_component(var, config)
await i2c.register_i2c_device(var, config)
cg.add(var.set_resolution(config[CONF_RESOLUTION]))
cg.add(var.set_measurement_duration(config[CONF_MEASUREMENT_DURATION]))

2
tests/test1.yaml
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@ -456,12 +456,10 @@ sensor:
name: "Living Room Brightness 3"
internal: true
address: 0x23
resolution: 1.0
update_interval: 30s
retain: False
availability:
state_topic: livingroom/custom_state_topic
measurement_duration: 31
i2c_id: i2c_bus
- platform: max44009
name: "Outside Brightness 1"