mirror of https://github.com/arendst/Tasmota.git
131 lines
3.5 KiB
C++
131 lines
3.5 KiB
C++
/*
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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
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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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* I2C Address: 0x23 or 0x5C
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\*********************************************************************************************/
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#define XSNS_10 10
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#define XI2C_11 11 // See I2CDEVICES.md
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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 bh1750_address;
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uint8_t bh1750_addresses[] = { BH1750_ADDR1, BH1750_ADDR2 };
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uint8_t bh1750_type = 0;
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uint8_t bh1750_valid = 0;
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uint16_t bh1750_illuminance = 0;
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char bh1750_types[] = "BH1750";
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bool Bh1750Read(void)
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{
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if (bh1750_valid) { bh1750_valid--; }
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if (2 != Wire.requestFrom(bh1750_address, (uint8_t)2)) { return false; }
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uint8_t msb = Wire.read();
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uint8_t lsb = Wire.read();
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bh1750_illuminance = ((msb << 8) | lsb) / 1.2;
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bh1750_valid = SENSOR_MAX_MISS;
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return true;
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}
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/********************************************************************************************/
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void Bh1750Detect(void)
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{
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for (uint32_t i = 0; i < sizeof(bh1750_addresses); i++) {
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bh1750_address = bh1750_addresses[i];
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if (I2cActive(bh1750_address)) { continue; }
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Wire.beginTransmission(bh1750_address);
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Wire.write(BH1750_CONTINUOUS_HIGH_RES_MODE);
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if (!Wire.endTransmission()) {
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I2cSetActiveFound(bh1750_address, bh1750_types);
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bh1750_type = 1;
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break;
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}
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}
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}
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void Bh1750EverySecond(void)
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{
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// 1mS
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if (!Bh1750Read()) {
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AddLogMissed(bh1750_types, bh1750_valid);
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}
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}
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void Bh1750Show(bool json)
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{
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if (bh1750_valid) {
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if (json) {
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ResponseAppend_P(JSON_SNS_ILLUMINANCE, bh1750_types, bh1750_illuminance);
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#ifdef USE_DOMOTICZ
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if (0 == tele_period) {
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DomoticzSensor(DZ_ILLUMINANCE, bh1750_illuminance);
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}
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#endif // USE_DOMOTICZ
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#ifdef USE_WEBSERVER
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} else {
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WSContentSend_PD(HTTP_SNS_ILLUMINANCE, bh1750_types, bh1750_illuminance);
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#endif // USE_WEBSERVER
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}
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}
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}
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/*********************************************************************************************\
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* Interface
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\*********************************************************************************************/
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bool Xsns10(uint8_t function)
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{
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if (!I2cEnabled(XI2C_11)) { return false; }
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bool result = false;
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if (FUNC_INIT == function) {
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Bh1750Detect();
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}
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else if (bh1750_type) {
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switch (function) {
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case FUNC_EVERY_SECOND:
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Bh1750EverySecond();
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break;
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case FUNC_JSON_APPEND:
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Bh1750Show(1);
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break;
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#ifdef USE_WEBSERVER
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case FUNC_WEB_SENSOR:
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Bh1750Show(0);
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break;
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#endif // USE_WEBSERVER
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}
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}
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return result;
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}
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#endif // USE_BH1750
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#endif // USE_I2C
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