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TPA81 Thermopile Array Sensor
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The TPA81 is a thermopile array
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 or
PicBasic Pro
compilers.
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Technical Data
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| Voltage |
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5V |
| Current |
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5mA typical without servo |
| Temperature Range |
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4°C - 100°C |
Accuracy
(full FOV) |
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+/-3°C from 4°C to 10°C
+/-2°C +/-2% from 10°C to 100°C |
| Field of View |
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41° x 6° (8 pixels of approximately
5° x 6°) |
| Outputs |
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1 ambient + 8 pixel temperatures |
| Communication |
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I2C interface |
| Servo |
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Controls servo in 32 steps to 180°
rotation |
| Dimensions |
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31mm x 18mm |
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