Thanks for sharing my project!
At the moment I also added a scale-prototype to my BeeMonitor. The scale is based on a Bosche H30A load cell, a HX711 converter and only measures the weight of a half beehive (half-scale). It’s the same principal as Broodminder and as seen here: Low-cost half-only scale platform (aluminium).
Current setup: Broodminder replaced with BeeMonitor: 1 internal beehive sensor & scale. Working great so far!
With the scale-prototype attached to the BeeMonitor there’s a higher power consumption, but the calculated battery life would still be about 1 year when taking measurements every 15 minutes. Not bad I guess!
After all that prototyping, testing, measuring, … version 2 of my BeeMonitor will be upgraded with:
- A direct load cell connector, with internal HX711 module & an easy on-the-go calibration procedure
- Up to 3x RJ12 plugs for external low-power I2C temperature/humidity sensors
Previous features will remain, I changed the internal electronics to archive a better battery life. Finally it was nessesary to add a boost-converter circuit because the load cell converter definitly needs a voltage >2,7V to keep the measurements correct! It also helps to squeeze even more out of the battery’s to keep the BeeMonitor longer alive :)
Background:
The communication is based on a RFM69 module, the data is combined in 1 message before sending. The receiver/gateway decodes the message. Right now I’m using Felix’s (from LowPowerLab) his RFM69-master library.
Future:
The data is now being processed in a custom Arduino based receiver module connected to my Raspberry Pi, running Domotics. That works great for my other sensor modules but it’s not suited for monitoring beehives. That’s why I want to change this to a Wi-Fi based gateway with RFM69 connected with Hiveeyes.
I won’t have a lot of time to start the gateway & software as I want to finish the development of the new BeeMonitor hardware first.