switch to DHT22

temp_sensor/platformio.ini

@@ -12,15 +12,15 @@
 platform = atmelavr
 board = attiny85
 framework = arduino
-lib_extra_dirs =
-    ../libraries
-    ~/Arduino/libraries
+lib_deps =
+	adafruit/Adafruit Unified Sensor @ ^1.1.4
+    adafruit/DHT sensor library@^1.4.3
+lib_extra_dirs = 
+	../libraries
+	~/Arduino/libraries
 upload_protocol = stk500v1
-; each flag in a new line
-upload_flags =
-    -P$UPLOAD_PORT
-    -b$UPLOAD_SPEED
-
-; edit these lines
+upload_flags = 
+	-P$UPLOAD_PORT
+	-b$UPLOAD_SPEED
 upload_port = /dev/ttyACM0
 upload_speed = 19200

temp_sensor/src/temp_sensor.cpp

@@ -1,39 +1,35 @@
 #include <Arduino.h>
 #include <TempSensor.h>
+#include <HumiditySensor.h>
 #include <TinyPower.h>
-#include <SoftwareSerial_Tiny.h>
+#include <DHT.h>
 
-#define DEBUG 0
 #define SEND_INTERVAL (int)(5*60/8)
 #define SEND_VCC_INTERVAL (int)(60*60/8)
 
 // Pins
 #define TEMP_POSITIVE PIN_B3
 #define SENDER PIN_B2
-#define TEMP_PIN A2
+#define DHT_PIN PIN_B4
 
-#if DEBUG
-#define RxD PIN_B3
-#define TxD PIN_B4
-SoftwareSerial AttinySerial(RxD, TxD);
-#endif
+struct DhtValues {
+	int temperature;
+	int humidity;
+};
+DhtValues readTemp();
 
-int readTemp();
-
-TempSensor sensor = TempSensor(TEMP_SENSOR, SENDER);
+TempSensor tempSensor = TempSensor(TEMP_SENSOR, SENDER);
+HumiditySensor humidSensor = HumiditySensor(TEMP_SENSOR, SENDER);
+DHT dht(DHT_PIN, DHT22);
 
 volatile int counter = 0;
 
 void setup() {
 
-#if DEBUG
-	AttinySerial.begin(9600);
-	AttinySerial.println("starting...");
-#endif
-	sensor.setup();
-	analogReference(INTERNAL);
+	tempSensor.setup();
 	pinMode(TEMP_POSITIVE, OUTPUT);
-	digitalWrite(TEMP_POSITIVE, LOW);
+	digitalWrite(TEMP_POSITIVE, HIGH);
+	dht.begin();
 
 	TinyPower::setup();
 	TinyPower::enableWdt(WDTO_8S);
@@ -41,35 +37,28 @@ void setup() {
 
 void loop() {
 	if (counter % SEND_VCC_INTERVAL == 0) {
-		sensor.sendTempAndVoltage(readTemp());
+		DhtValues values = readTemp();
+		tempSensor.sendTempAndVoltage(values.temperature);
+		delay(100);
+		humidSensor.sendHumidity(values.humidity);
 		counter = 0;
 	} else if (counter % SEND_INTERVAL == 0) {
-		sensor.sendTemp(readTemp());
+		DhtValues values = readTemp();
+		tempSensor.sendTemp(values.temperature);
+		delay(100);
+		humidSensor.sendHumidity(values.humidity);
 	}
 	TinyPower::sleep();
 }
 
-int readTemp() {
+DhtValues readTemp() {
 	digitalWrite(TEMP_POSITIVE, HIGH);
 	delay(10);
-	int reading = analogRead(TEMP_PIN);
+	DhtValues dhtValues;
+	dhtValues.temperature = roundf(dht.readTemperature() * 10);
+	dhtValues.humidity = roundf(dht.readHumidity() * 10);
 	digitalWrite(TEMP_POSITIVE, LOW);
-#if DEBUG
-	AttinySerial.println(reading);
-#endif
-
-	float voltage = reading * (1100 / 1024.0);
-#if DEBUG
-	AttinySerial.print(voltage);
-	AttinySerial.println(" mili volts");
-#endif
-
-	float temperatureC = (voltage - 500) / 10;
-#if DEBUG
-	AttinySerial.print(temperatureC);
-	AttinySerial.println(" degrees C");
-#endif
-	return roundf(temperatureC * 10);
+	return dhtValues;
 }
 
 ISR(PCINT0_vect) {