By Jon McPhalen View In Digital Edition
Last time, we wrote some code for the SHT11 humidity/temperature sensor. It’s a nice sensor, but expensive. On the other end of the price/performance scale is the DHT11. It doesn't have the range or accuracy of its cousin, but it comes with a user-friendly price-tag: about $5 from US vendors. The DHT11 (and slightly more accurate DHT22) use a one-wire protocol, so we'll write a driver for that and have another tool in the box for humidity and temperature measurement.
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