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) 2019 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
*
* I2C Address: 0x23 or 0x5C
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\*********************************************************************************************/
#define XSNS_10 10
#define XI2C_11 11 // See I2CDEVICES.md
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#define BH1750_ADDR1 0x23
#define BH1750_ADDR2 0x5C
#define BH1750_CONTINUOUS_HIGH_RES_MODE 0x10 // Start measurement at 1lx resolution. Measurement time is approx 120ms.
uint8_t bh1750_address;
uint8_t bh1750_addresses[] = { BH1750_ADDR1, BH1750_ADDR2 };
uint8_t bh1750_type = 0;
uint8_t bh1750_valid = 0;
uint16_t bh1750_illuminance = 0;
char bh1750_types[] = "BH1750";
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bool Bh1750Read(void)
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{
if (bh1750_valid) { bh1750_valid--; }
if (2 != Wire.requestFrom(bh1750_address, (uint8_t)2)) { return false; }
uint8_t msb = Wire.read();
uint8_t lsb = Wire.read();
bh1750_illuminance = ((msb << 8) | lsb) / 1.2;
bh1750_valid = SENSOR_MAX_MISS;
return true;
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}
/********************************************************************************************/
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void Bh1750Detect(void)
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{
for (uint32_t i = 0; i < sizeof(bh1750_addresses); i++) {
bh1750_address = bh1750_addresses[i];
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if (I2cActive(bh1750_address)) { continue; }
Wire.beginTransmission(bh1750_address);
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Wire.write(BH1750_CONTINUOUS_HIGH_RES_MODE);
if (!Wire.endTransmission()) {
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I2cSetActiveFound(bh1750_address, bh1750_types);
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bh1750_type = 1;
break;
}
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}
}
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void Bh1750EverySecond(void)
{
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// 1mS
if (!Bh1750Read()) {
AddLogMissed(bh1750_types, bh1750_valid);
}
}
void Bh1750Show(bool json)
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{
if (bh1750_valid) {
if (json) {
ResponseAppend_P(JSON_SNS_ILLUMINANCE, bh1750_types, bh1750_illuminance);
#ifdef USE_DOMOTICZ
if (0 == tele_period) {
DomoticzSensor(DZ_ILLUMINANCE, bh1750_illuminance);
}
#endif // USE_DOMOTICZ
#ifdef USE_WEBSERVER
} else {
WSContentSend_PD(HTTP_SNS_ILLUMINANCE, bh1750_types, bh1750_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_type) {
switch (function) {
case FUNC_EVERY_SECOND:
Bh1750EverySecond();
break;
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