During my researches for my home automation project I also stumbled across the MQTT protocol for sensor-server-communication. A matching arduino library was found quickly here on Nick's blog. An arduino sketch was quickly copied from here and modified. Download my version from here.
Für den ersten nanoKeyer habe ich mir zwar das Original-Gehäuse gekauft, aber der Einfachheit halber eine simple Alu-Fronplatte genommen. So richtig schick war die auf Dauer nicht. Es wurde langsam Zeit, dass er noch eine schöne Frontplatte bekommt.
The electronics for my capacitive (water) level sensor is described here. In this article I will go a little bit in depth regarding the sensor reading and value compensation.
This is the second PCB I've developed. It is an arduino-shield for my home automation project. It is also devoped using CADSoft EAGLE and was produced by PCB-Devboards in Germany.
The hardware for the MODBus master is mounted on DIN-rails inside a cheap installation box.
The MODBUS-slave with the capacitive water level sensor is now mounted inside a die cast aluminium case.
In the previous article regarding the capacitive water level sensor, I've presented two different electrode designs:
Here my findings regarding each electrode.
This is a MODBUS-node with a capacitive water level sensor, a DS12S80 temperature sensor and a RS485 interface to the main controller.
This is my first project based on CADSOFT Eagle free-version. I still have to learn a lot for creating 2-layer PCBs :-/
2014 CW (Morse Telegraphy) was added to the German Nationwide Inventory of Intangible Cultural Heritage.
© 2021 Dietmar Krause, DL2SBA