Just a quick note on those DHT11/DHT22 sensors. Ignoring the fact that their humidity sensor is absolutely craptastic and permanently breaks if humidity goes too high(*), the one wire sensor protocol needs very tight timing, see Basics of Interfacing DHT11/DHT22 Humidity and Temperature Sensor with MCU.

The problem with running these (or other protocols that have implicit timing requirements like WS28xx LED strings) is that you simply can't guarantee that from a user land process (or even "at all") on a system like Linux or Windows. Especially, if you have a high process load. Your process simply might not get scheduled at the right times. In all likelyhood, the sensor will work most of the times, but you'll sometimes get random data and/or errors. For me, a cheap microcontroller and Device::SerialPort usually solve the trick for these kind of problems.

(*) DHT11 - temp ok, but RH values wildly off. I generally now recommend using a Bosch BME280 breakout board instead. At least from the limited tests i've done on my projects, this sensor seems to be a lot more reliable long term.

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In reply to Re^4: XS Modules - why and when? by cavac
in thread XS Modules - why and when? by Bod

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