Florian
da859cc6ae
https://community.openmqttgateway.com/t/arduino-uno-ethernet-shield-reboots-on-receiving-rf-signal-on-v-0-9/346/22 Rework led management to avoid use of global variables and specify special JSON_MSG_BUFFER for arduino UNO led can now be used for all the boards generalize use of F macro for memory optimization change jsonbuffer calculation method reduce pubsubclient max packet size for uno and nano
129 lines
4.3 KiB
Arduino
129 lines
4.3 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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#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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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)) {//retriving value of Lux, FtCd and Wattsm2 from BH1750
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trc(F("Creating BH1750 buffer"));
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const int JSON_MSG_CALC_BUFFER = JSON_OBJECT_SIZE(3);
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StaticJsonBuffer<JSON_MSG_CALC_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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trc(F("Failed to read from LightSensor BH1750!"));
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}else{
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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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/*
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Useful Information ;-)
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lux (lx) # 1 lx = 1 lm/m² = 1 cd·sr·m⁻².
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meter-candle (m-cd) # 1 m·cd = 1 lx = 1 lm/m² = 1 cd·sr·m⁻².
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centimeter-candle (cm-sd) # 1 m·cd = 1 lx = 1 lm/m² = 1 cd·sr·m⁻².
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foot-candle (ft-c) #
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phot (ph) # 1 ph = 1 lm/cm² = 10,000 lm/m² - 10,000 lx = 10 klx
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nox (nx) # 1 nox = 1 millilux
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candela steradin/meter2(cd·sr·m⁻²) # 1 lx = 1 lm/m² = 1 cd·sr·m⁻²
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lumen/meter2 (lm·m⁻²) # 1 lx = 1 lm/m² = 1 cd·sr·m⁻²
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lumen/centimeter2 (lm·cm⁻²) # 1 lm/cm² = 10,000 lx = 10,000 cd·sr·m⁻²
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lumen/foot2 (lm·ft⁻²) # (lm·ft⁻²)
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watt/centimeter2 at 555nm (W·cm⁻²) #
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*/
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// Generate Lux
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if(Lux != persistedll || bh1750_always){
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BH1750data.set("lux", (unsigned int)Lux);
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}else{
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trc(F("Same lux don't send it"));
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}
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// Generate FtCd
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if(ftcd != persistedlf || bh1750_always){
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BH1750data.set("ftcd", (unsigned int)ftcd);
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}else{
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trc(F("Same ftcd don't send it"));
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}
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// Generate Watts/m2
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if(Wattsm2 != persistedlw || bh1750_always){
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BH1750data.set("wattsm2", (unsigned int)Wattsm2);
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}else{
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trc(F("Same wattsm2 don't send it"));
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}
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if(BH1750data.size()>0) 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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