Tasmota/sonoff/xsns_10_bh1750.ino

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/*
xsns_10_bh1750.ino - BH1750 ambient light sensor support for Sonoff-Tasmota
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Copyright (C) 2018 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 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()
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{
if (bh1750_valid) { bh1750_valid--; }
if (2 != Wire.requestFrom(bh1750_address, (uint8_t)2)) { return false; }
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byte msb = Wire.read();
byte lsb = Wire.read();
bh1750_illuminance = ((msb << 8) | lsb) / 1.2;
bh1750_valid = SENSOR_MAX_MISS;
return true;
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}
/********************************************************************************************/
void Bh1750Detect()
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{
if (bh1750_type) {
return;
}
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for (byte i = 0; i < sizeof(bh1750_addresses); i++) {
bh1750_address = bh1750_addresses[i];
Wire.beginTransmission(bh1750_address);
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Wire.write(BH1750_CONTINUOUS_HIGH_RES_MODE);
if (!Wire.endTransmission()) {
bh1750_type = 1;
snprintf_P(log_data, sizeof(log_data), S_LOG_I2C_FOUND_AT, bh1750_types, bh1750_address);
AddLog(LOG_LEVEL_DEBUG);
break;
}
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}
}
void Bh1750EverySecond()
{
if (90 == (uptime %100)) {
// 1mS
Bh1750Detect();
}
else {
// 1mS
if (bh1750_type) {
if (!Bh1750Read()) {
AddLogMissed(bh1750_types, bh1750_valid);
// if (!bh1750_valid) { bh1750_type = 0; }
}
}
}
}
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#ifdef USE_WEBSERVER
const char HTTP_SNS_ILLUMINANCE[] PROGMEM =
"%s{s}%s " D_ILLUMINANCE "{m}%d " D_UNIT_LUX "{e}"; // {s} = <tr><th>, {m} = </th><td>, {e} = </td></tr>
#endif // USE_WEBSERVER
void Bh1750Show(boolean json)
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{
if (bh1750_valid) {
if (json) {
snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s,\"%s\":{\"" D_JSON_ILLUMINANCE "\":%d}"), mqtt_data, bh1750_types, bh1750_illuminance);
#ifdef USE_DOMOTICZ
if (0 == tele_period) {
DomoticzSensor(DZ_ILLUMINANCE, bh1750_illuminance);
}
#endif // USE_DOMOTICZ
#ifdef USE_WEBSERVER
} else {
snprintf_P(mqtt_data, sizeof(mqtt_data), HTTP_SNS_ILLUMINANCE, mqtt_data, bh1750_types, bh1750_illuminance);
#endif // USE_WEBSERVER
}
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}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
#define XSNS_10
boolean Xsns10(byte function)
{
boolean result = false;
if (i2c_flg) {
switch (function) {
case FUNC_INIT:
Bh1750Detect();
break;
case FUNC_EVERY_SECOND:
Bh1750EverySecond();
break;
case FUNC_JSON_APPEND:
Bh1750Show(1);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_APPEND:
Bh1750Show(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
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#endif // USE_BH1750
#endif // USE_I2C