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switch to DHT22

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This commit is contained in:
Nicu Hodos 2021-12-25 15:34:00 +01:00
parent 8c1ec36a31
commit d31a52f5ac
2 changed files with 36 additions and 47 deletions
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18
temp_sensor/platformio.ini
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@ -12,15 +12,15 @@
platform = atmelavr platform = atmelavr
board = attiny85 board = attiny85
framework = arduino framework = arduino
lib_extra_dirs = lib_deps =
../libraries adafruit/Adafruit Unified Sensor @ ^1.1.4
~/Arduino/libraries adafruit/DHT sensor library@^1.4.3
lib_extra_dirs =
../libraries
~/Arduino/libraries
upload_protocol = stk500v1 upload_protocol = stk500v1
; each flag in a new line upload_flags =
upload_flags = -P$UPLOAD_PORT
-P$UPLOAD_PORT -b$UPLOAD_SPEED
-b$UPLOAD_SPEED
; edit these lines
upload_port = /dev/ttyACM0 upload_port = /dev/ttyACM0
upload_speed = 19200 upload_speed = 19200

65
temp_sensor/src/temp_sensor.cpp
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@ -1,39 +1,35 @@
#include <Arduino.h> #include <Arduino.h>
#include <TempSensor.h> #include <TempSensor.h>
#include <HumiditySensor.h>
#include <TinyPower.h> #include <TinyPower.h>
#include <SoftwareSerial_Tiny.h> #include <DHT.h>
#define DEBUG 0
#define SEND_INTERVAL (int)(5*60/8) #define SEND_INTERVAL (int)(5*60/8)
#define SEND_VCC_INTERVAL (int)(60*60/8) #define SEND_VCC_INTERVAL (int)(60*60/8)
// Pins // Pins
#define TEMP_POSITIVE PIN_B3 #define TEMP_POSITIVE PIN_B3
#define SENDER PIN_B2 #define SENDER PIN_B2
#define TEMP_PIN A2 #define DHT_PIN PIN_B4
#if DEBUG struct DhtValues {
#define RxD PIN_B3 int temperature;
#define TxD PIN_B4 int humidity;
SoftwareSerial AttinySerial(RxD, TxD); };
#endif DhtValues readTemp();
int readTemp(); TempSensor tempSensor = TempSensor(TEMP_SENSOR, SENDER);
HumiditySensor humidSensor = HumiditySensor(TEMP_SENSOR, SENDER);
TempSensor sensor = TempSensor(TEMP_SENSOR, SENDER); DHT dht(DHT_PIN, DHT22);
volatile int counter = 0; volatile int counter = 0;
void setup() { void setup() {
#if DEBUG tempSensor.setup();
AttinySerial.begin(9600);
AttinySerial.println("starting...");
#endif
sensor.setup();
analogReference(INTERNAL);
pinMode(TEMP_POSITIVE, OUTPUT); pinMode(TEMP_POSITIVE, OUTPUT);
digitalWrite(TEMP_POSITIVE, LOW); digitalWrite(TEMP_POSITIVE, HIGH);
dht.begin();
TinyPower::setup(); TinyPower::setup();
TinyPower::enableWdt(WDTO_8S); TinyPower::enableWdt(WDTO_8S);
@ -41,35 +37,28 @@ void setup() {
void loop() { void loop() {
if (counter % SEND_VCC_INTERVAL == 0) { if (counter % SEND_VCC_INTERVAL == 0) {
sensor.sendTempAndVoltage(readTemp()); DhtValues values = readTemp();
tempSensor.sendTempAndVoltage(values.temperature);
delay(100);
humidSensor.sendHumidity(values.humidity);
counter = 0; counter = 0;
} else if (counter % SEND_INTERVAL == 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(); TinyPower::sleep();
} }
int readTemp() { DhtValues readTemp() {
digitalWrite(TEMP_POSITIVE, HIGH); digitalWrite(TEMP_POSITIVE, HIGH);
delay(10); 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); digitalWrite(TEMP_POSITIVE, LOW);
#if DEBUG return dhtValues;
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);
} }
ISR(PCINT0_vect) { ISR(PCINT0_vect) {