Hello, I have some simple code that reads a temp and publishes its value every 10 seconds. I’d like it to only send the data when theres a change in temp greater than 3 degrees. Im unsure of the code and also wondering if that saved value is retained when the device loses power. Any suggestions? …

To answer this one first [image] Autoidlab: wondering if that saved value is retained when the device loses power. If your device really loses power and you haven't got a backup power connected (e.g. coin cell on VBAT for Photons) then the last values won't be retained, unless you store them…

Hello, I tried your suggestion. Then publishes are now combined (good idea!) but the events are publishing regardless of changes. What did I do wrong here? // Variables float temperature; float humidity; // DHT sensor DHT dht(DHTPIN, DHTTYPE); void setup() { // Start DHT sensor d…

What I meant was this tho’ void loop() { static uint32_t ms = 0; if (millis() - ms < 10000) return; // if the last visit was less than 10 sec ago bail out ms = millis(); char data[32]; float newTemp = dht.getTempFarenheit(); if (fabs(newTemp - temperature) > 3.0) { temperature …

[image] ScruffR: If your device really loses power and you haven’t got a backup power connected (e.g. coin cell on VBAT for Photons) then the last values won’t be retained, unless you store them in EEPROM (or any other non-volatile medium). I'm sure you know this, but lest anyone be confused,…

Ok, got it! That all works. How would that work with something like GPS coordinates (ie - 12.345678) If I only want to publish changes in position? I can’t convert a char to float, correct? TinyGPS gps; char szInfo[64]; // Every 15 minutes int sleep = 1 * 60 * 1000; void setup(){ Seria…

You can convert char to float, but you don’t need to since the GPS library should provide you with the latitude and longitude values as floats and if you are using TinyGPS++ library you should also get a distanceBetween() function that you can use to calculate the distance between your last and curr…

Thats a much better library. Thank you!

Event driven Temp help

Troubleshooting

HEng September 28, 2018, 10:51pm 6

I'm sure you know this, but lest anyone be confused, when you use battery backup you need to declare a variable as 'retained'. Variables are not automatically saved when you have VBAT.

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Event driven Temp help

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