Currently I am using DHT11 in my project, but its not very sensitive, it is quite slow in detecting temperature changes.
What sensor could I use that will be more sensitive?
Currently I am using DHT11 in my project, but its not very sensitive, it is quite slow in detecting temperature changes.
What sensor could I use that will be more sensitive?
I've tried a fair few different types... if you want just temperature, then i'd highly recommend the MCP9808 (http://www.adafruit.com/products/1782) - it's pretty quick to get a reading and you can put it into shutdown / powerdown mode and it consumes uA (although from my testing you need around 250mS for it to wake up). Very accurate too.
Also, I've recently been playing around with the Si7021 which also gives Humidity, it's a little slower than the MCP9808 but it is comparable for accuracy but with the obvious benefit of Humidity too. (http://www.ebay.co.uk/itm/Industrial-High-Precision-Si7021-Humidity-Sensor-with-I2C-Interface-Arduino-Hot-/231568758450?hash=item35ea92d6b2:g:8GMAAOSwpDdVRc8F)
I hope that helps :)
Cheers
Andy
Sensitivity and slow acting are completely different. The slow devices will measure the temperature they just take longer.
For speed I would suggest a low mass thermocouple. The semiconductor devices are great but inherently slow because of the thermal resistance of the plastic case. As soon as you put the thermocouple in a jacket it will also slow down.
There are some boards that you can use that implement a K thermocouple.
Good Luck,
Gil
If one wants a "highly sensitive" sensor, then the DHT's are terrible.
Terrible meaning: just ok accuracy, slow reaction speed, and long-term stability.
I've tried a bunch now- because my application needed a really good (see criteria above) temp and H and the SHT series by Sensirion
definitely was the best I found. There may be others as good- you tell me.
Grab an SHT* (sht31-d for example, which has a nice i2c interface)- they're awesome. I've found the response times for humidity, for example, to be a few hundred ms.
Adafruit now has them on breakout boards ready to go for about $13.
For instance, if you put it against your skin, the H readings will start jumping.
I'm using these with great success.