mirror of
https://github.com/IoTManagerProject/IoTManager.git
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108 lines
3.3 KiB
C++
108 lines
3.3 KiB
C++
/*
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* The MySensors Arduino library handles the wireless radio link and protocol
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* between your home built sensors/actuators and HA controller of choice.
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* The sensors forms a self healing radio network with optional repeaters. Each
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* repeater and gateway builds a routing tables in EEPROM which keeps track of the
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* network topology allowing messages to be routed to nodes.
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*
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* Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
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* Copyright (C) 2013-2019 Sensnology AB
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* Full contributor list: https://github.com/mysensors/MySensors/graphs/contributors
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*
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* Documentation: http://www.mysensors.org
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* Support Forum: http://forum.mysensors.org
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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*******************************
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*
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* DESCRIPTION
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*
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* MH-Z14 CO2 sensor
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*
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* Wiring:
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* Pad 1, Pad 5: Vin (Voltage input 4.5V-6V)
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* Pad 2, Pad 3, Pad 12: GND
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* Pad 6: PWM output ==> pin 6
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*
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* From: http://davidegironi.blogspot.fr/2014/01/co2-meter-using-ndir-infrared-mh-z14.html
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* MH-Z14 has a PWM output, with a sensitivity range of 0ppm to 2000ppm CO2, an accuracy of ±200ppm.
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* The cycle is 1004ms±5%, given the duty cicle Th (pulse high), Tl is 1004-Th, we can convert it to CO2 value using the formula:
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* CO2ppm = 2000 * (Th - 2ms) /(Th + Tl - 4ms)
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* From: http://airqualityegg.wikispaces.com/Sensor+Tests
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* - response time is less than 30 s
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* - 3 minute warm up time
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* datasheet: http://www.futurlec.com/Datasheet/Sensor/MH-Z14.pdf
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* Contributor: epierre
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*/
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// Enable debug prints to serial monitor
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#define MY_DEBUG
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// Enable and select radio type attached
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#define MY_RADIO_RF24
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//#define MY_RADIO_NRF5_ESB
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//#define MY_RADIO_RFM69
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//#define MY_RADIO_RFM95
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#include <MySensors.h>
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#define CHILD_ID_AIQ 0
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#define AIQ_SENSOR_ANALOG_PIN 6
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uint32_t SLEEP_TIME = 30*1000; // Sleep time between reads (in milliseconds)
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float valAIQ =0.0;
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float lastAIQ =0.0;
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MyMessage msg(CHILD_ID_AIQ, V_LEVEL);
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MyMessage msg2(CHILD_ID_AIQ, V_UNIT_PREFIX);
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void setup()
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{
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pinMode(AIQ_SENSOR_ANALOG_PIN, INPUT);
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}
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void presentation()
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{
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// Send the sketch version information to the gateway and Controller
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sendSketchInfo("AIQ Sensor CO2 MH-Z14", "1.0");
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// Register all sensors to gateway (they will be created as child devices)
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present(CHILD_ID_AIQ, S_AIR_QUALITY);
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send(msg2.set("ppm"));
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}
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void loop()
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{
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//uint32_t duration = pulseIn(AIQ_SENSOR_ANALOG_PIN, HIGH);
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while(digitalRead(AIQ_SENSOR_ANALOG_PIN) == HIGH) {
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;
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}
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//wait for the pin to go HIGH and measure HIGH time
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uint32_t duration = pulseIn(AIQ_SENSOR_ANALOG_PIN, HIGH);
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//Serial.print(duration/1000); Serial.println(" ms ");
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//from datasheet
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//CO2 ppm = 2000 * (Th - 2ms) / (Th + Tl - 4ms)
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// given Tl + Th = 1004
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// Tl = 1004 - Th
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// = 2000 * (Th - 2ms) / (Th + 1004 - Th -4ms)
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// = 2000 * (Th - 2ms) / 1000 = 2 * (Th - 2ms)
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long co2ppm = 2 * ((duration/1000) - 2);
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//Serial.print(co2ppm);
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if ((co2ppm != lastAIQ)&&(abs(co2ppm-lastAIQ)>=10)) {
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send(msg.set((int32_t)ceil(co2ppm)));
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lastAIQ = ceil(co2ppm);
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}
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//Serial.println();
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// Power down the radio. Note that the radio will get powered back up
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// on the next write() call.
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sleep(SLEEP_TIME); //sleep for: sleepTime
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}
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