Temperature Sensor Project – Quozl

Just a handful of components builds an 8-pin microcontroller based circuit for temperature logging via a serial port; small, fast, and acceptably accurate. The program in the microcontroller knows two protocols; the one wire bus used by the DS1820 temperature sensor, and the serial protocol expected by your computer. Once power is applied, the program fetches data from the sensors and sends it to the serial port, repeatedly.

Temperature Sensor Project – Quozl

Features

  • provides real-time data to your computer via serial port,
  • interfaces up to four DS1820 temperature sensors,
  • absolute accuracy near 0.5 degrees celcius (as per DS1820 specifications),
  • relative accuracy near 0.01 degrees celcius,
  • speaks in Centigrade or Fahrenheit (selectable by header pins),
  • powered by your computer’s serial port, no extra supply to organise,
  • data format easily processed, no special programs required,
  • minimal parts count reduces cost,
  • built-in serial number for circuit identification,
  • special versions available for exotic requirements; high speed, low speed, additional sensors, long distance or pedantic serial bus.
  • spare inputs can be used as single-bit digital inputs, (feature removed from final version but can be re-inserted),
dapj

dapj

dapj means digital analog power junction

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