Posted by: Tyler Green | 04/01/2010

Digital Temperature Sensor

Temperature SensorThis week in my Logical Design Lab (EE 281), we constructed a digital temperature sensor.  It consisted of an analog temperature sensor, an analog to digital converter, and programmed logic on an FPGA.  As you can see in the image, the series of red and green LEDs represents the output code of the analog to digital converter before the code is transformed into degrees Fahrenheit.  This means that even before the 7-segment displays were powered to give a decimal read out, and the fact that this is a college engineering class, all the students were extremely excited when their red and green LEDs displayed a binary code that represented between 85 and 90 in decimal (that meant a correct reading).  If you placed your finger (or the end of a soldering iron) on the temperature sensor, you could even watch the LEDs and segments flicker as they began to display the next degree Fahrenheit.  Now that is what you call digital excitement!

Some of you may be wondering why it was only 59 degrees in the lab, but I will direct that question towards the calibration engineers who designed the temperature sensor.

The next lab involves a tape-following electric car, which should present both a challenge and room for growth.  Only three more dissertations lab reports to write this semester!


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