Hi Wim / Paysan,
I work in electronic and have also beekeeping as hobby. This project is very interesting: great job realized.
I have just a few questions:
Have you thought about using pessure sensor as MPX5100 to measure hive weight: using simple smooth hydraulically linked containers placed on 4 corners's hive? Preesure is then, function of weight.
About battery, why don't you use a lithium battery size D: it's what is used in industry for GPRS system, which is adapted to Temperature, long life duty and high current need for GPS?
Could you please share your realisation (schematics, ref for OTS parts and SW code)?
Thanks and regards
Alain