---
name: "Device::USB::PCSensor::HidTEMPer::NTC::External"
section: "3pm"
platform: "linux"
package: "libdevice-usb-pcsensor-hidtemper-perl"
version: "2:0.04-3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Device::USB::PCSensor::HidTEMPer::NTC::External"
---

# Device::USB::PCSensor::HidTEMPer::NTC::External(3pm)

The HidTEMPerNTC external sensor

## NAME

Device::USB::PCSensor::HidTEMPer::NTC::Internal - The HidTEMPerNTC external sensor

## VERSION

Version 0.02

## SYNOPSIS

None

## DESCRIPTION

This is the implementation of the HidTEMPerNTC external sensor.

### CONSTANTS

- •

  MAX\_TEMPERATURE

  The highest temperature(150 degrees celsius) this sensor can detect.

- •

  MIN\_TEMPERATURE

  The lowest temperature(-50 degrees celsius) this sensor can detect.

- •

  INITIAL\_GAIN

  The initial gain value used to calculate voltage returned

- •

  CALIBRATION\_VALUES

  Values used to calculate Volt7705Calibration

### METHODS

- •

  **new()**

  Returns a new External sensor object.

- •

  **celsius()**

  Returns the current temperature from the device in celsius degrees.

  The formula used to calculate value based on a calibrated key value is created using the Eureqa tool from Cornell Computational Synthesis Lab, http://ccsl.mae.cornell.edu/eureqa.

  Resulting in the use of this formula instead of the provided number list: f(y)=66.7348/(66.7275/(67.8088 - 9.70353\*log(0.000251309 + y\*y)) - 0.21651)

  If you find another formula that is more accurate please drop me a line.  The data used can be found in the source code of this file.

## INHERIT METHODS FROM

Device::USB::PCSensor::HidTEMPer::Sensor

## DEPENDENCIES

This module internally includes and takes use of the following packages:

```
  use Carp;
  use Time::HiRes qw / sleep /;
  use Device::USB::PCSensor::HidTEMPer::Sensor;
```

This module uses the strict and warning pragmas.

## BUGS

Please report any bugs or missing features using the CPAN RT tool.

## FOR MORE INFORMATION

None

## AUTHOR

Magnus Sulland \< msulland@cpan.org \>

## ACKNOWLEDGEMENTS

This code includes findings done by Robin B. Jensen,  http://www.drunkardswalk.dk, when converting the received hex values into volt.

## COPYRIGHT & LICENSE

Copyright (c) 2010-2011 Magnus Sulland

This program is free software; you can redistribute it and/or modify it  under the same terms as Perl itself.