Using Ticker to call a function that returns a value
Posted: Thu Jun 29, 2017 6:15 pmCan I use Ticker with a function that returns a value? Starting with an IO.Adafruit publish example, I use millis() to check if 30s has elapsed and then I call a function that reads a DHT22 sensor and publishes three values to io.adafruit.com. Works great (even if the DHT22 is occasionally flaky). I have a while() that loops if bad data was returned, with a delay(100). On a 0 return, I go do something else. I also subscribe to a toggle to turn and LED on and off and would like to publish the state of the LED back to io.adafruit so I can tell if the remote toggle actually worked. If the toggle subscription notification arrives while the DHT22 is being read out, the LED is not toggled.
I'd like to eliminate the millis() and use Ticker.
I am at the learning-experiment phase here.
Suggestions?
I'd like to eliminate the millis() and use Ticker.
I am at the learning-experiment phase here.
Suggestions?
Code: Select all
// Adafruit IO Publish Example, modified to do other stuff too
#include "config.h"
#include <DHT.h>
#define DHTPIN D4 //pin gpio 2 in sensor
#define LED_PIN D5
#define LED_TOGGLE D3
#define BUTTON_PIN D6
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
unsigned long previousMillis = 0;
unsigned long currentMillis;
const long interval = 30000;
bool ToggleState = false;
float humid = 0.0;
float temp_C = 0.0;
float temp_F = 0.0;
int good_temp;
int errorcount = 0;
// Functions
int gettemp();
// set up the feeds
AdafruitIO_Feed *humidity = io.feed("humidity");
AdafruitIO_Feed *temperatureC = io.feed("temp_C");
AdafruitIO_Feed *temperatureF = io.feed("temp_F");
AdafruitIO_Feed *LEDState = io.feed("ToggleState");
AdafruitIO_Feed *digital = io.feed("digital");
void setup() {
dht.begin();
pinMode(BUTTON_PIN, INPUT_PULLUP);
pinMode(LED_PIN, OUTPUT);
pinMode(LED_TOGGLE, OUTPUT);
digitalWrite(LED_PIN, HIGH);
digitalWrite(LED_TOGGLE, HIGH);
// start the serial connection
Serial.begin(115200);
// wait for serial monitor to open
while(! Serial);
Serial.print("Connecting to Adafruit IO");
// connect to io.adafruit.com
io.connect();
// wait for a connection
while(io.status() < AIO_CONNECTED) {
Serial.print(".");
delay(500);
}
// we are connected
Serial.println();
Serial.println(io.statusText());
digital->onMessage(handleMessage);
}
void loop() {
errorcount = 0;
// io.run(); is required for all sketches.
// it should always be present at the top of your loop
// function. it keeps the client connected to
// io.adafruit.com, and processes any incoming data.
io.run();
currentMillis = millis();
if(currentMillis - previousMillis > interval) {
previousMillis = currentMillis;
digitalWrite(LED_PIN, LOW);
while( good_temp = gettemp() ){
Serial.println( errorcount++ );
delay(100);
}
}
digitalWrite(LED_PIN, HIGH);
ToggleState = digitalRead(D3);
}
int gettemp(){
// Grab the current state of the sensor
humid = (int)dht.readHumidity();
temp_C = (int)dht.readTemperature();
temp_F = (int)dht.readTemperature(true);
if( temp_C < 200 || humid < 150 ){ // filter out the integer-cast NANs
// Publish data
if (! temperatureC->save(temp_C))
Serial.println(F("Failed to publish temperature"));
else
Serial.print(F("Temperature published: "));
Serial.print(temp_C);
Serial.println(F("C"));
if (! temperatureF->save(temp_F))
Serial.println(F("Failed to publish temperature"));
else
Serial.print(F("Temperature published: "));
Serial.print(temp_F);
Serial.println(F("F"));
if (! humidity->save(humid))
Serial.println(F("Failed to publish humidity"));
else
Serial.print(F("Humidity published:"));
Serial.println(humid);
return 0;
}else{
Serial.println(F("invalid data received from sensor"));
return 1;
}
}
void handleMessage(AdafruitIO_Data *data) {
Serial.print("received <- ");
Serial.println(data->value());
if(data->toPinLevel() == HIGH){
digitalWrite(LED_TOGGLE, LOW);
Serial.println("HIGH");
}else{
Serial.println("LOW");
digitalWrite(LED_TOGGLE, HIGH);
}
}