Hi,

I would like to hang a sensor outsite my house, for example a temperature sensor, and I want it to sent its readings every 5 minutes to a mbed powered read station.

What is the best way to setup the wireless connection? I would like to power the sensors using a battery, but I do not want to change the battery every day, so it should be as low power as possible.

One solution I found is using XBee. Is that a good sollution or are there better ones?

TI has some low-power RF solutions, might be worth a try.

The TI/Chipcon CC1101 ultra low power 868 MHz chipset is available in an easy-to-use form from Seeed Studios as the RFbee - it's an Arduino-compatible AVR attached to the CC1101 via SPI - you could either patch into the SPI or use the AVR as is for the sensor. It saves a lot of time designing an antenna and matching circuit, and is also cheaper than other eval boards which only have the radio and not the AVR.

Hello

I use small devices from http://www.hoperf.com/rf_fsk/rfm12.htm  called rfm12. They have a SPI Interface and are easy to use. In germany they will cost abot 5 € .

The RFM12B devices are 3.3 Volt devices

Dieter Brueggemann wrote:

Hello

I use small devices from http://www.hoperf.com/rf_fsk/rfm12.htm  called rfm12. They have a SPI Interface and are easy to use. In germany they will cost abot 5 € .

 

The RFM12B devices are 3.3 Volt devices

Franz Achatz wrote:

 

Dieter Brueggemann wrote:

Hello

I use small devices from http://www.hoperf.com/rf_fsk/rfm12.htm  called rfm12. They have a SPI Interface and are easy to use. In germany they will cost abot 5 € .

 

The RFM12B devices are 3.3 Volt devices

 

Please have a look at the Jeelabs page or look for Jennic wire less products.

best regards

Franz