I have prototyped some PIC code in C to read a DS1820 1-Wire temperature
sensor, based on some Maxim app notes and their owpd library.
After a lot of failures and messing around, it did finally respond with a
presence pulse, temperature reading and a valid CRC. Warming the sensor with my
fingers showed the temp climb up a few degrees, then down again when released.
Wonderful I thought, until............. after possibly touching the 1-Wire it
suddenly stopped working permanently (no presence pulse).
Not really sure why it failed, but I do know that a few hours before it worked
there was no presence pulse. It all seems a bit flaky....so I have ordered a
USB to 1-Wire adaptor so can at least verify the devices are ok with the Maxim
One-Wire-Wiewer.
The devices are marked DS1820 but they are in the smaller package of the
DS18S20 so they might be old stock. Any advice on what I can do software wise,
apart from testing with the One-Wire-Viewer?
cheers
Paul
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