Telos
Rev B (Low Power Wireless Sensor Module)
Moteiv Corporation
Telos (Rev B) : PRELIMINARY Datasheet (12/5/2004)
Page 22 of 28
Light Sensors
A variety of light sensors may be used with Telos. Telos (rev A) has connections for two
photodiodes. Moteiv currently uses photodiodes from Hamamatsu Corporation
(http://www.hamamatsu.com)
If your mote is populated with light photodiodes, the default diodes are the S1087 for sensing
photosynthetically active radiation and the S1087-01 for sensing the entire visible spectrum
including infrared
Although these photodiodes from Hamamatsu have been tested with Telos, any photodiode with
similar physical dimensions may be used with Telos.
0
0.1
0.2
0.3
0.4
0.7
200
400
600
800
1000
WAVELENGTH (nm)
PHOTO SENSITIVITY (A/W)
(Typ. Ta=25oû
C)
0.5
0.6
S1087
S1087-01
QE=100 %
Figure 21 : Photo Sensitivity of the Light sensors on Telos (from Hamamatsu)
