This is my first ever post on the arduino forum, so be gentle
I would like to use an arduino to measuring the weight of some beehives, and then have a gsm mudule send the result as an sms to my cellphone. Something like this:http://www.bienenwaage.de/englisch/beehivescales.html
The spec i need from the scale is:
- Be able to measure weights from 0 - 150 kg
- Have a tolerance on ± 1-2 kg
- Sensor can be calibrated in the beginning of the season, and then stand for about five months without calibration or zeroing.
- The sensor is placed outside so it have to deal with varius humidity levels and temperaturs from 0 - 35 degrees Celsius.
- If the prototype works promising, I would like to build 20-30 scales, so the parts needs to be as cheap as possible.
My question is what kind of sensor can i use to achieve this specs? Is loadcells the only way to go? I thought loadcells had a problem with drifting during long time sessions(and they are a bit expensive ;))
Thank you for your reponses.