Tasmota/tasmota/xsns_10_bh1750.ino

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/*
xsns_10_bh1750.ino - BH1750 ambient light sensor support for Tasmota
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Copyright (C) 2020 Theo Arends
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This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
#ifdef USE_I2C
#ifdef USE_BH1750
/*********************************************************************************************\
* BH1750 - Ambient Light Intensity
*
* Bh1750Resolution1 0..2 - Set BH1750 1 resolution mode
* Bh1750Resolution2 0..2 - Set BH1750 2 resolution mode
* Bh1750MTime1 30..255 - Set BH1750 1 MT register
* Bh1750MTime2 30..255 - Set BH1750 2 MT register
*
* I2C Address: 0x23 or 0x5C
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\*********************************************************************************************/
#define XSNS_10 10
#define XI2C_11 11 // See I2CDEVICES.md
#define BH1750_ADDR1 0x23
#define BH1750_ADDR2 0x5C
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#define BH1750_CONTINUOUS_HIGH_RES_MODE2 0x11 // Start measurement at 0.5 lx resolution. Measurement time is approx 120ms.
#define BH1750_CONTINUOUS_HIGH_RES_MODE 0x10 // Start measurement at 1 lx resolution. Measurement time is approx 120ms.
#define BH1750_CONTINUOUS_LOW_RES_MODE 0x13 // Start measurement at 4 lx resolution. Measurement time is approx 16ms.
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#define BH1750_MEASUREMENT_TIME_HIGH 0x40 // Measurement Time register high 3 bits
#define BH1750_MEASUREMENT_TIME_LOW 0x60 // Measurement Time register low 5 bits
#define D_PRFX_BH1750 "Bh1750"
#define D_CMND_RESOLUTION "Resolution"
#define D_CMND_MTREG "MTime"
const char kBh1750Commands[] PROGMEM = D_PRFX_BH1750 "|" // Prefix
D_CMND_RESOLUTION "|" D_CMND_MTREG ;
void (* const Bh1750Command[])(void) PROGMEM = {
&CmndBh1750Resolution, &CmndBh1750MTime };
struct {
uint8_t addresses[2] = { BH1750_ADDR1, BH1750_ADDR2 };
uint8_t resolution[3] = { BH1750_CONTINUOUS_HIGH_RES_MODE, BH1750_CONTINUOUS_HIGH_RES_MODE2, BH1750_CONTINUOUS_LOW_RES_MODE };
uint8_t count = 0;
char types[7] = "BH1750";
} Bh1750;
struct {
uint8_t address;
uint8_t valid = 0;
uint8_t mtreg = 69; // Default Measurement Time
uint16_t illuminance = 0;
} Bh1750_sensors[2];
/*********************************************************************************************/
uint8_t Bh1750Resolution(uint32_t sensor_index) {
uint8_t settings_resolution = Settings.SensorBits1.bh1750_1_resolution;
if (1 == sensor_index) {
settings_resolution = Settings.SensorBits1.bh1750_2_resolution;
}
return settings_resolution;
}
bool Bh1750SetResolution(uint32_t sensor_index) {
Wire.beginTransmission(Bh1750_sensors[sensor_index].address);
Wire.write(Bh1750.resolution[Bh1750Resolution(sensor_index)]);
return (!Wire.endTransmission());
}
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bool Bh1750SetMTreg(uint32_t sensor_index) {
Wire.beginTransmission(Bh1750_sensors[sensor_index].address);
uint8_t data = BH1750_MEASUREMENT_TIME_HIGH | ((Bh1750_sensors[sensor_index].mtreg >> 5) & 0x07);
Wire.write(data);
if (Wire.endTransmission()) { return false; }
Wire.beginTransmission(Bh1750_sensors[sensor_index].address);
data = BH1750_MEASUREMENT_TIME_LOW | (Bh1750_sensors[sensor_index].mtreg & 0x1F);
Wire.write(data);
if (Wire.endTransmission()) { return false; }
return Bh1750SetResolution(sensor_index);
}
bool Bh1750Read(uint32_t sensor_index) {
if (Bh1750_sensors[sensor_index].valid) { Bh1750_sensors[sensor_index].valid--; }
if (2 != Wire.requestFrom(Bh1750_sensors[sensor_index].address, (uint8_t)2)) { return false; }
float illuminance = (Wire.read() << 8) | Wire.read();
illuminance /= (1.2 * (69 / (float)Bh1750_sensors[sensor_index].mtreg));
if (1 == Bh1750Resolution(sensor_index)) {
illuminance /= 2;
}
Bh1750_sensors[sensor_index].illuminance = illuminance;
Bh1750_sensors[sensor_index].valid = SENSOR_MAX_MISS;
return true;
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}
/********************************************************************************************/
void Bh1750Detect(void) {
for (uint32_t i = 0; i < sizeof(Bh1750.addresses); i++) {
if (I2cActive(Bh1750.addresses[i])) { continue; }
Bh1750_sensors[Bh1750.count].address = Bh1750.addresses[i];
if (Bh1750SetMTreg(Bh1750.count)) {
I2cSetActiveFound(Bh1750_sensors[Bh1750.count].address, Bh1750.types);
Bh1750.count++;
}
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}
}
void Bh1750EverySecond(void) {
for (uint32_t i = 0; i < Bh1750.count; i++) {
// 1mS
if (!Bh1750Read(i)) {
// AddLogMissed(Bh1750.types, Bh1750.valid);
}
}
}
/*********************************************************************************************\
* Commands
\*********************************************************************************************/
void CmndBh1750Resolution(void) {
if ((XdrvMailbox.index > 0) && (XdrvMailbox.index <= Bh1750.count)) {
if ((XdrvMailbox.payload >= 0) && (XdrvMailbox.payload <= 2)) {
if (1 == XdrvMailbox.index) {
Settings.SensorBits1.bh1750_1_resolution = XdrvMailbox.payload;
} else {
Settings.SensorBits1.bh1750_2_resolution = XdrvMailbox.payload;
}
Bh1750SetResolution(XdrvMailbox.index -1);
}
ResponseCmndIdxNumber(Bh1750Resolution(XdrvMailbox.index -1));
}
}
void CmndBh1750MTime(void) {
if ((XdrvMailbox.index > 0) && (XdrvMailbox.index <= Bh1750.count)) {
if ((XdrvMailbox.payload > 30) && (XdrvMailbox.payload < 255)) {
Bh1750_sensors[XdrvMailbox.index -1].mtreg = XdrvMailbox.payload;
Bh1750SetMTreg(XdrvMailbox.index -1);
}
ResponseCmndIdxNumber(Bh1750_sensors[XdrvMailbox.index -1].mtreg);
}
}
/********************************************************************************************/
void Bh1750Show(bool json) {
for (uint32_t sensor_index = 0; sensor_index < Bh1750.count; sensor_index++) {
if (Bh1750_sensors[sensor_index].valid) {
char sensor_name[10];
strlcpy(sensor_name, Bh1750.types, sizeof(sensor_name));
if (Bh1750.count > 1) {
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snprintf_P(sensor_name, sizeof(sensor_name), PSTR("%s%c%02X"), sensor_name, IndexSeparator(), Bh1750_sensors[sensor_index].address); // BH1750-23
}
if (json) {
ResponseAppend_P(JSON_SNS_ILLUMINANCE, sensor_name, Bh1750_sensors[sensor_index].illuminance);
#ifdef USE_DOMOTICZ
if ((0 == tele_period) && (0 == sensor_index)) {
DomoticzSensor(DZ_ILLUMINANCE, Bh1750_sensors[sensor_index].illuminance);
}
#endif // USE_DOMOTICZ
#ifdef USE_WEBSERVER
} else {
WSContentSend_PD(HTTP_SNS_ILLUMINANCE, sensor_name, Bh1750_sensors[sensor_index].illuminance);
#endif // USE_WEBSERVER
}
}
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}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns10(uint8_t function) {
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if (!I2cEnabled(XI2C_11)) { return false; }
bool result = false;
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if (FUNC_INIT == function) {
Bh1750Detect();
}
else if (Bh1750.count) {
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switch (function) {
case FUNC_EVERY_SECOND:
Bh1750EverySecond();
break;
case FUNC_COMMAND:
result = DecodeCommand(kBh1750Commands, Bh1750Command);
break;
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case FUNC_JSON_APPEND:
Bh1750Show(1);
break;
#ifdef USE_WEBSERVER
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case FUNC_WEB_SENSOR:
Bh1750Show(0);
break;
#endif // USE_WEBSERVER
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}
}
return result;
}
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#endif // USE_BH1750
#endif // USE_I2C