Hello Mark
I had the same sort of problems with the DS1307 RTC with 3 boards I have, they keep poor time as they are not calibrated so I moved to the RX8025 with a calibrated internal crystal this might be something for Atmel to think about doing.
I would love to have access to a humidity standard to compare the DHT-11, DHT-22 which do not come even close to my wet/dry hygrometer.
I also have a question for you that you may be able to answer, how do I calibrate a tipping bucket rain guage?
I want to add one to my watering controller >see blog section.
A bit off topic but still about calibration :)
Regards Paul
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