No, I still run the B12, as I still need to obtain a TTL-USB cable. Anyway, I put two thermistors in parallel, and it nicely shows ambient temp around 20oC (07.30am here now). I lighted a cigaret lighter and put the thermistors in the warm air above the flame, and the CA showed the temp increase. Within seconds the CA showed 130oC, after which I removed the lighter. Then the CA nicely showed the decrease in temp, and within 1 minute the temp was ambient again.
Very happy with the results! Thanks, Justin for the support and for developping the CA in the first place!
Maybe a suggestion to keep all requirements for thermistors the same between future CA versions and the CAnalogger, or have a simple pot added to the PCB to change the pull-up value.
justin_le wrote:Hi Hjns, did you update the firmware with the B13 that was posted last week? In the original B12 the look-up table was assuming we used a 10K pull-up resistor although we made a board change to a 5K pull-up at the last minute so that the device would be more sensitive and accurate at the higher temperature range. If you don't have access to a programmer and want to use the B12 firmware, you can either a) connector two of your thermistors in parallel which will effectively behave like a single 5K thermistor so that the ratio is right, or b) replace the 4.99kOhm pull-up resistor on the PCB (R1) with a 10K pull-up.