mirror of https://github.com/arendst/Tasmota.git
113 lines
3.1 KiB
C++
113 lines
3.1 KiB
C++
/*
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xsns_bh1750.ino - BH1750 ambient light sensor support for Sonoff-Tasmota
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Copyright (C) 2017 Theo Arends
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef USE_I2C
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#ifdef USE_BH1750
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/*********************************************************************************************\
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* BH1750 - Ambient Light Intensity
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\*********************************************************************************************/
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#define BH1750_ADDR1 0x23
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#define BH1750_ADDR2 0x5C
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#define BH1750_CONTINUOUS_HIGH_RES_MODE 0x10 // Start measurement at 1lx resolution. Measurement time is approx 120ms.
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uint8_t bh1750addr;
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uint8_t bh1750type = 0;
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char bh1750stype[7];
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uint16_t bh1750_readLux(void)
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{
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Wire.requestFrom(bh1750addr, (uint8_t)2);
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byte msb = Wire.read();
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byte lsb = Wire.read();
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uint16_t value = ((msb << 8) | lsb) / 1.2;
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return value;
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}
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boolean bh1750_detect()
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{
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if (bh1750type) {
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return true;
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}
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uint8_t status;
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boolean success = false;
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bh1750addr = BH1750_ADDR1;
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Wire.beginTransmission(bh1750addr);
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Wire.write(BH1750_CONTINUOUS_HIGH_RES_MODE);
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status = Wire.endTransmission();
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if (status) {
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bh1750addr = BH1750_ADDR2;
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Wire.beginTransmission(bh1750addr);
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Wire.write(BH1750_CONTINUOUS_HIGH_RES_MODE);
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status = Wire.endTransmission();
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}
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if (!status) {
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success = true;
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bh1750type = 1;
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strcpy_P(bh1750stype, PSTR("BH1750"));
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}
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if (success) {
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snprintf_P(log_data, sizeof(log_data), PSTR(D_LOG_I2C "%s " D_FOUND_AT " 0x%x"), bh1750stype, bh1750addr);
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addLog(LOG_LEVEL_DEBUG);
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} else {
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bh1750type = 0;
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}
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return success;
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}
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/*********************************************************************************************\
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* Presentation
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\*********************************************************************************************/
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void bh1750_mqttPresent(uint8_t* djson)
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{
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if (!bh1750type) {
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return;
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}
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uint16_t l = bh1750_readLux();
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snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s, \"%s\":{\"" D_ILLUMINANCE "\":%d}"), mqtt_data, bh1750stype, l);
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*djson = 1;
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#ifdef USE_DOMOTICZ
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domoticz_sensor5(l);
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#endif // USE_DOMOTICZ
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}
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#ifdef USE_WEBSERVER
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const char HTTP_SNS_ILLUMINANCE[] PROGMEM =
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"<tr><th>BH1750 " D_ILLUMINANCE "</th><td>%d " D_UNIT_LUX "</td></tr>";
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String bh1750_webPresent()
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{
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String page = "";
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if (bh1750type) {
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char sensor[80];
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snprintf_P(sensor, sizeof(sensor), HTTP_SNS_ILLUMINANCE, bh1750_readLux());
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page += sensor;
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}
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return page;
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}
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#endif // USE_WEBSERVER
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#endif // USE_BH1750
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#endif // USE_I2C
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