73 lines
2.0 KiB
C++
73 lines
2.0 KiB
C++
/* Macrocell environmental sensor project EnviSens
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*
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* This firmware provides features to use an ATMEGA µC as an environmental sensor provider.
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* Currently supported sensors:
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* - digital pin D2: DHT22 temperature and humidity sensor
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* - analog pin A0: MQ135 gas and air quality sensor
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*
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* (C) 2019 Macrocell - Environmental Sensing Solutions (MESS)
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* proudly presented by Macrocell - FPGA Innovators
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*/
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#include <Wire.h>
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#include "DHT.h"
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#include "configuration.h"
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#define MQ135_PIN A0
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#define DHT_PIN 2 // Digital pin connected to the DHT sensor
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#define DHT_TYPE DHT22 // DHT 22 (AM2302), AM2321
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DHT dht(DHT_PIN, DHT_TYPE);
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int sensorValue;
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long last_sample = 0;
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float hmid = 0; // humidity
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float temp = 0; // temperature
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float heat = 0; // heat index
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float airq = 0; // air quality / gas
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void setup() {
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Serial.begin(SERIAL_BAUDRATE);
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pinMode(MQ135_PIN, INPUT);
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pinMode(LED_BUILTIN, OUTPUT);
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digitalWrite(LED_BUILTIN, LOW);
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dht.begin();
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Wire.begin(8); // join i2c bus with address #8
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Wire.onRequest(requestEvent); // register event
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}
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void requestEvent() {
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Wire.write("he1234");
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}
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void loop() {
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long now = millis();
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if (now - last_sample > OPERATION_PERIOD / 2) {
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if (OPERATION_BLINK_EN) {digitalWrite(LED_BUILTIN, LOW);}
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}
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if (now - last_sample > OPERATION_PERIOD) {
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last_sample = now;
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if (OPERATION_BLINK_EN) {digitalWrite(LED_BUILTIN, HIGH);}
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hmid = dht.readHumidity();
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temp = dht.readTemperature();
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if (isnan(hmid) || isnan(temp)) {
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Serial.println(F("Failed to read from DHT sensor!"));
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} else {
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heat = dht.computeHeatIndex(temp, hmid, false);
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Serial.print(F("Humidity: "));
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Serial.print(hmid);
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Serial.print(F("% Temperature: "));
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Serial.print(temp);
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Serial.print(F("°C Heat index: "));
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Serial.print(heat);
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Serial.print(F("°C "));
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}
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airq = analogRead(MQ135_PIN);
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Serial.print("AirQuality: ");
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Serial.print(airq);
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Serial.println(" PPM");
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}
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}
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