Input Devices


Temperature Sensor with NTC thermistor

I use the temperature example in the class page for make this python powered thermometer device. First, use the traces with a 0.4mm tool for milling with the SRM-20 + FabModules.

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The FabModule toolpath looks great, I download it and then repeat the process for the contour operation with 1/32 inch tool.

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The device is recognized, so I know the device is working and ready to program.


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AVRDUDESS is running on a virtual machine of windows 7 under VMware.


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Using the USBasp and AVRDUDESS I upload the .hex

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I install py Serial, running: "easy_install -U pyserial", the I run the python script with "sudo python ./hello.temp.45.py /dev/tty.usbserial-A50285BI". The device is connected through a serial to USB converter.

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Work info:

References: Class page

Description:

In this assignment I use the temperature example, I couldn`t make my own board, but I try to understand all the steps and logic behind. A thermistor is a resistor that changes it's value dependent on temperature. NTC means "negative temperature coefficient", and means that the resistance decreases with temperature. In other hand, PTC is "positive temperature coefficient" and resistance increases with temperature. This assignment is complemented with temperature and humidity sensor used in my final project