Devantech TPA81 Thermopile Array Sensor
The TPA81 from Devantech is a thermopile array sensor which detects infrared in the 2um-22um range. This is the wavelength of radiant heat, therefore the TPA81 is unaffected by ambient light.
The TPA81 can detect a candle flame at a range of 2 metres.
It has an array of eight thermopile sensors arranged in a row. The TPA81 can measure the temperature of 8 adjacent points simultaneously. The module can also control a servo to pan itself around and build up a thermal image.
Communication with the TPA81 module is via the I2C bus. This is available on popular controllers such as the BASIC Stamp BS2P, as well as a wide variety of microcontrollers. I2C communications with a PIC Microcontroller may easily be implemented using the PicBasic Pro compiler.
|Current||5mA typical without servo|
|Temperature Range||4°C - 100°C|
|+/-3°C from 4°C to 10°C
+/-2°C +/-2% from 10°C to 100°C
|Field of View||41° x 6° (8 pixels of approximately 5° x 6°)|
|Outputs||1 ambient + 8 pixel temperatures|
|Servo||Controls servo in 32 steps to 180° rotation|
|Dimensions||31mm x 18mm|