Connection of cheap BME680 from Ebay in China
With the help of a Grove to 2.54m single socket plug adapter cable this can be done very easily.
Connection diagram BME680 to Grove cable:
Pluggable load cell connection
In order to be able to disassemble the electronics more easily for maintenance work or with changes (without that the beehive must be lifted from the balance), I decided to connect the balance pluggably to the electronics. Costs for this approx. 10€ (for socket and plug).
There are certainly cheaper connectors, but are they permanently tight and smooth-running?
Hierfür verwende ich wasserfeste 5 polige Rundsteckverbinder von Reichelt (Hersteller Lumberg). Da der Stecker keine geeignete Schirmkontaktierung hat, verwende ich die 5 polige Variante um über den fünften Pol den Schirm zu kontaktieren (gelbes Kabel).
On the scale side I use the Lumberg IP68 connector: Costs about 6,20€.
On the electronics side there is a socket which can be mounted from the inside. Costs about 3,10€ and is only available as IP44-version at Reichelt. The IP44 variant differs from the IP68 variant but only by an additional seal between the connector flange and our plastic housing can be inserted (but if you tighten the flange well so that it presses into the plastic housing, it should also be sufficiently tight…).
Here you can also see the additional GND connection between the Raspberry load cell side pin “E-” which is missing on some HX711 boards. I have also connected the shield of the load cell (yellow wire) to this connection.
Mounting DHT22 or BME680 on the outside of the plastic housing
With self-tapping plastic screw or hot-melt adhesive:
Pictures of the Banggood load cell
12V5V DC-DC converter in rubber box connected to the USB cable
Finished IP68 DC-DC converter module with USB socket (3,30€):
As an alternative to
To be continued…
Translated 08.10.2019 by JK