I2C Humidity Sensor
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==Possible mounting places== | ==Possible mounting places== | ||
* next to the GPS antenna | * next to the GPS antenna | ||
| − | * inside the | + | * inside the GSM antenna |
* behind the speaker holes | * behind the speaker holes | ||
* ... | * ... | ||
I tried the first two options. After drilling small holes both places can be used, but even without top cover I was able to measure a temperature difference of about one degree celsius between the inside and outside of the case. | I tried the first two options. After drilling small holes both places can be used, but even without top cover I was able to measure a temperature difference of about one degree celsius between the inside and outside of the case. | ||
Revision as of 23:59, 1 August 2010
General description
The SHT21 from Sensirion is a digital humidity and temperature sensor with a easy to use I2C interface. It connects to your Freerunner just like the I2C Pressure Sensor.
A simple kernel driver is already available from here.
Mounting
The relative humidity depends on the ambient temperature. This makes it rather difficult to find the best mounting place for the sensor. The requirements are:
- contact with fresh air
- minimize errors introduced through external heat from other electronic components.
Possible mounting places
- next to the GPS antenna
- inside the GSM antenna
- behind the speaker holes
- ...
I tried the first two options. After drilling small holes both places can be used, but even without top cover I was able to measure a temperature difference of about one degree celsius between the inside and outside of the case.
