Apaguard V2.0
Note on 1st may 2020
- The HX712 does not bring anything compared to the HX711, the advertised gain of 256 is FAKE !! Confirmed by AVIA, but they continue to advertise this... ! Don't buy !
- The BME 280 does not last very long when used outside, even under a good shield. After some months, the hygrometer is showing 100 % all the time. The datasheet says it can be reconditioned, but hard to do for us...
This newer prototype has 4 A/D converters built around the newer HX712. The DS3231 RTC and a LT1761-5 low noise voltage regulator are on the pcb.
For cost and ease of use, i kept the Arduino Pro Mini rather than a ATMEL 328P soldered on pcb.
The 4 analog inputs allow the measure of either 4 differents hives with one load cell, or 2 hives with 2 load cells each, or a single hive with 4 cells. The software has to be modified accordingly.
Arduino pinout
| A0 | Scale 1 | Out |
| A1 | Scale 1 | Sck |
| A2 | Scale 2 | Out |
| A3 | Scale 2 | Sck |
| D13 | Scale 3 | Out |
| D12 | Scale 3 | Sck |
| D4 | Scale 4 | Out |
| D5 | Scale 4 | Sck |
| D2 | DS3231 | INT |
| D3 | Alarme/Key | |
| D9 | SIM900 | CMD |
| D8 | SIM900 | TX |
| D7 | SIM900 | RX |
| D10 | CALIB | |
| D11 | 18BS20 | |
| A4 | I2C | SDA |
| A5 | I2C | SCL |
| A6 | Spare | |
| A7 | Vbat. |
Here is the database diagram.
I've written a new Web user interface (UI) allowing to administrator to create new Apaguards, and users.
A user can manage his account, Apaguards, apiaries and hives as well as having access to all collected datas via tables and graphs.
The page can be reached here : http://www.egloff.eu/apaguard