129 lines
3.6 KiB
Arduino
129 lines
3.6 KiB
Arduino
/*
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OpenMQTTGateway Addon - ESP8266 or Arduino program for home automation
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Act as a wifi or ethernet gateway between your 433mhz/infrared IR signal and a MQTT broker
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Send and receiving command by MQTT
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This is the Light Meter Addon:
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- Measures ambient Light Intensity in Lux (lx), Foot Candela (ftcd) and Watt/m^2 (wattsm2)
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- Required Hardware Module: BH1750
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Connection Schemata:
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--------------------
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BH1750 ------> Arduino Uno ----------> ESP8266
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==============================================
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Vcc ---------> 5V -------------------> Vu (5V)
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GND ---------> GND ------------------> GND
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SCL ---------> Pin A5 ---------------> D1
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SDA ---------> Pin A4 ---------------> D2
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ADD ---------> N/C (Not Connected) --> N/C (Not Connected)
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Copyright: (c) Hans-Juergen Dinges
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This file is part of OpenMQTTGateway.
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OpenMQTTGateway 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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OpenMQTTGateway 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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#include "User_config.h"
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#ifdef ZsensorBH1750
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#include "math.h" // Library for trig and exponential functions
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#include "Wire.h" // Library for communication with I2C / TWI devices
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void setupZsensorBH1750()
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{
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Log.notice(F("Setup BH1750 on adress: %H" CR), BH1750_i2c_addr);
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Wire.begin();
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Wire.beginTransmission(BH1750_i2c_addr);
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Wire.write(0x10); // Set resolution to 1 Lux
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Wire.endTransmission();
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delay(300);
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}
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// void loop()
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void MeasureLightIntensity()
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{
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if (millis() > (timebh1750 + TimeBetweenReadingBH1750))
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{ //retriving value of Lux, FtCd and Wattsm2 from BH1750
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Log.trace(F("Creating BH1750 buffer" CR));
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StaticJsonBuffer<JSON_MSG_BUFFER> jsonBuffer;
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JsonObject &BH1750data = jsonBuffer.createObject();
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timebh1750 = millis();
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unsigned int i = 0;
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static float persistedll;
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static float persistedlf;
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static float persistedlw;
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unsigned int Lux;
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float ftcd;
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float Wattsm2;
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// Check if reads failed and exit early (to try again).
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Wire.requestFrom(BH1750_i2c_addr, 2);
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if (Wire.available() != 2)
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{
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Log.error(F("Failed to read from LightSensor BH1750!" CR));
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}
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else
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{
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i = Wire.read();
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i <<= 8;
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i |= Wire.read();
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// Calculate the Values
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Lux = i / 1.2; // Convert to Lux
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ftcd = Lux / 10.764;
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Wattsm2 = Lux / 683.0;
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// Generate Lux
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if (Lux != persistedll || bh1750_always)
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{
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BH1750data.set("lux", (unsigned int)Lux);
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}
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else
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{
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Log.trace(F("Same lux don't send it" CR));
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}
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// Generate FtCd
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if (ftcd != persistedlf || bh1750_always)
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{
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BH1750data.set("ftcd", (unsigned int)ftcd);
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}
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else
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{
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Log.trace(F("Same ftcd don't send it" CR));
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}
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// Generate Watts/m2
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if (Wattsm2 != persistedlw || bh1750_always)
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{
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BH1750data.set("wattsm2", (unsigned int)Wattsm2);
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}
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else
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{
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Log.trace(F("Same wattsm2 don't send it" CR));
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}
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if (BH1750data.size() > 0)
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pub(subjectBH1750toMQTT, BH1750data);
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}
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persistedll = Lux;
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persistedlf = ftcd;
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persistedlw = Wattsm2;
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}
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}
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#endif
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