Here is a low cost temperature sensor which can be connected to a PC via its serial port, allowing the PC to monitor and record temperatures. GregM and Martin researched various options for low-cost temperature sensors which could be easily interfaced to a PC, and came across the DS18S20, a 1-wire parasite-power digital thermometer sensor made by Maxim-Dallas.
It’s a very small sensor, in a TO-92 package, with a temperature range of -55 degrees to +125 degrees Celsius (with 0.5 degrees C accuracy between -10 degrees and +85 degrees Celsius), and requires minimal circuitry to interface it to a PC’s serial port.
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Software for communicating with these temperature sensors is readily available for both linux and Windows.
Multiple DS18S20 temperature sensors can be connected in parallel, as they have unique 64-bit addresses, and can be individually queried on a 1-wire bus.
Note that the DS18S20 temperature sensors have “DS1820” written on them, but they are actually the DS18S20 – for some reason, Maxim haven’t updated the details stamped on each sensor.
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