Time and accuracy
KraZe_EyE
Posts: 15
Hello again fellow stamp-inites!
My latest project for school is building a kiln for my glass blowing hobby; specifically slowly cooling down the temperature within the kiln over a long period of time.
I'm wondering how accurate the stamp stays to time say over an hour? (kiln cool down times are around 7-10 hours)
I have to check the temp every 30 seconds, check against known cool down time formula, update temp display, turn heating elements on/off, update LCD display then wait the rest of the time(pause) and do it again.
any idea how far off my timing would be after 10 hours?
I Saw there was a clock for sale in the parallax store; who's had good/bad experiences with that product?
Thanks,
-Matt
My latest project for school is building a kiln for my glass blowing hobby; specifically slowly cooling down the temperature within the kiln over a long period of time.
I'm wondering how accurate the stamp stays to time say over an hour? (kiln cool down times are around 7-10 hours)
I have to check the temp every 30 seconds, check against known cool down time formula, update temp display, turn heating elements on/off, update LCD display then wait the rest of the time(pause) and do it again.
any idea how far off my timing would be after 10 hours?
I Saw there was a clock for sale in the parallax store; who's had good/bad experiences with that product?
Thanks,
-Matt
Comments
It would seem that a programmatic timing loop in PBASIC using PAUSE or SLEEP commands would suffice in giving you 30 second intervals to perform your functions. Check more in HELP for the accuracy of these commands as there is some plus minus factor of about 1%. I guess it depends how accurate your timing must be. If absolute clock time is essential for some reason, I've found the DS1302 to work fine for that. I've used it in combination with a DS1620 to collect data center temperatures and feed the data to Stamp Plot. Of course you may have to use something other than the 1620 to get your temperature readings depending on the temperature ranges you are dealing with.
Rick
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Tracy Allen
www.emesystems.com