matthewnitschke / reservoir

Reservoir

A server and plugin setup for a decent espresso machine that monitors wastewater level with a proximity sensor

The server can run on a raspberry pi and my setup uses a cheap xkc-y25-npn water sensor

The tcl plugin will notify you on boot if your water reservoir is full or not

Setup - Software

Server

1. Clone the repo into a raspberry pi and run cd server && sudo ./install.sh, this script will automatically install and start the service via systemctl
2. Attach a water level sensor to GPIO pin 2

Plugin

1. Setup a sftp server on your tablet, set port to 2222 and default directory to de1plus
2. Run cd plugin && install.sh yourUser@yourTabletIPAddr
3. Reboot the de1plus app
4. Go to settings -> plugins, and enable the 'Reservoir' plugin

Setup - Hardware

For my setup, I am using xkc-y25-npn non contact liquid sensors, and a basic raspberry pi (any would do, I think I'm using a B+ model 3)

Connection is quite easy:

• Brown wire goes to the 5v connection on the pi
• Yellow wire goes to GPIO pin 2 on the pi
• Blue wire goes to GND on the pi
• Black wire can be ignored

Development

The server runs against port 8080, water level calls can be run directly against this: http://IP_ADDR_OF_PI:8080

There is also a "debug" mode which will force the sensor to be true, you can toggle this mode by going to: http://IP_ADDR_OF_PI:8080/debug