Hi, i am using the OneWire Library. The sensor works great, but in the library on some points there are delays. Although i power the sensor in non-parasitic mode, there are still delays necessary. i do not need very fast measuring intervals (e.g. 3000ms is enough).
is there a non-blocking type of library for this sensor out there (which works like the "blink without delay" - example)?
This OneWire library ? OneWire Arduino Library, connecting 1-wire devices (DS18S20, etc) to Teensy
Which code do you use for the DS18B20 ? The example code from the OneWire library ?
How much delay is allowed ?
5us ? 480us ?
If half-a-millisecond is not allowed, why not ?
What about disabling interrupts ? Is that allowed.
I needed fast other interrupts in a project, so I removed the disabling of the interrupts. But then I have to try 10 times to read it, and once in a while (once in a few weeks) the 10 times still fail.
After the DS18B20 is started, about 1 second is waited in the highest resolution. That delay can easily be avoided.
I would use millis() to create a block in the code that runs every second. At second '0' I would start the DS18B20, and at second '1' I would read it. And so on. It will be like a background task running every second.
Yes, thats the library, and i tried its sample code. i tried to avoid writing my own code, because i never used a onWire sensor so far.
you mentiond exactly the way i want to do it, but i thought i could just modify the library. is it complicated writing my own function for calling and reading the sensor in my millis()-block? os there a sample code just for starting and reading the sensor?
The OneWire library comes with a few examples, one for normal temperature reading of the DS18B20. In that example you can see that it is started and after that a delay of 1000ms.
When you installed the OneWire library properly, you can find its examples in the menu of the Arduino IDE.
Take a look at Miles Burton's Dallas temperature library
By default, it waits for the sensor when you ask for temperature but you can use setWaitForConversion and manage the wait yourself using millis.
hi,
thank you, your hint was very helpful:-)
i already had a look at m. burtons library, but i din't look at the "WaitForConversion2" - example, and thats EXACTLY what i meant. i am glad that i do not have to implement the setWaitForConversion() - function by my own:-))