HIP:Temperature Sensors

RTP - Ruggedized Wide Range Temperature Probe

• DS18S20 or a DS18B20 1-Wire temperature sensor
• [Link]
• [Specification Sheet]

Troubleshooting

• The 85C response is an error indication from the sensor that means that the temperature conversion was not properly finished. This is usually due to the +5v pin on a DS18S20 not being tied to GND (which puts the sensor into parasite power mode). The other 2 cases are if it doesn't get enough power during the conversion, either due to a under-powered serial port or not enough time to finish the conversion. In digitemp you can extend the conversion time by passing -r 2000 to wait 2 seconds instead of the default 1 second. [Link]
  • Raising digitemp's read delay (-r) to 3000ms fixed the 180F error for me (copelco).