Spark app to read a DHT11 sensor and publish humidity and temperature as Spark variables.
I got the Spark Core device from the Kickstarter project and this is my first project.
The circuit is a DHT11 connected to 3v3, GND and a data pin. I use the internal pullup on the data pin:
I noticed a lot of people had issues with the DHT sensors and I could
not get the Adafruit library working myself. The Adafruit
code is pretty iffy,
requires higher timing resolution than necessary and doesn't support
the internal pullup resistor. So I wrote my own simple version that
uses the internal pullup resistor. It reads the relative humidity and
temperature from a DHT11 sensor every 10 seconds and stores them in
the Spark variables rh and temp respectively.
There's also a Python script that reads the values every minute and uploads them to Xively.