Waveshare PoE HAT CLI (Command Line Interface)

Small command line interface for Waveshare PoE HAT B with OLED Display.

Find this project on GitHub https://github.com/pietmacom/waveshare-poe-hat-b-cli and on DockerHub https://hub.docker.com/r/pietmacom/waveshare-poe-hat-b-cli

Features

• Docker Image
• Command line interface
  • Turn fan on and off
  • View up to four lines on your OLED Display (size and positions are adapted automatically)
• Binary does not have to be recompiled to view different content
• Almost no dependencies

Docker

Run command

foo@bar:~$ docker run --privileged -it pietmacom/waveshare-poe-hat-b-cli /root/waveshare-poe-hat-b-cli oled "Hello World!"
foo@bar:~$ docker run --privileged -it pietmacom/waveshare-poe-hat-b-cli /root/waveshare-poe-hat-b-cli fan on

Run simple script simple.sh

foo@bar:~$ docker run --privileged -it pietmacom/waveshare-poe-hat-b-cli

#!/bin/sh -e

_fanState="off"
_fanOnTemperature="40000"
_fanOffTemperature="35000"

while true; do
    _temperature="$(cat /sys/class/thermal/thermal_zone0/temp)"

    _temperatureViewAwk="BEGIN { printf \"%.2f C\", (${_temperature}/1000) }"
    _temperatureView=$(awk "${_temperatureViewAwk}";)

    if [[ "${_temperature}" -gt "${_fanOnTemperature}" ]]; then
        _fanState="on"
    elif [[ "${_temperature}" -lt "${_fanOffTemperature}" ]]; then
        _fanState="off"
    fi

    ./waveshare-poe-hat-b-cli fan ${_fanState}
    ./waveshare-poe-hat-b-cli oled "T: ${_temperatureView}" "F: ${_fanState}"
    sleep 3
done

Run your own script

Copy simple.sh, make your changes and mount it into your new container.

foo@bar:~$ docker run --privileged -it -v yourscript.sh:/root/script.sh pietmacom/waveshare-poe-hat-b-cli

Docker Compose

version: '3'

services:
  waveshare-poe-hat-b-cli:
    image: pietmacom/waveshare-poe-hat-b-cli:latest
    privileged: true
    restart: "unless-stopped"

Command Line (Shell)

Control FAN

foo@bar:~$ sudo ./waveshare-poe-hat-b-cli fan on
Fan turned on!

foo@bar:~$ sudo ./waveshare-poe-hat-b-cli fan off
Fan turned off!

Control OLED

foo@bar:~$ sudo ./waveshare-poe-hat-b-cli oled "row1"
row 1: row1

foo@bar:~$ sudo ./waveshare-poe-hat-b-cli oled "row1" "row2"
row 1: row1
row 2: row2

foo@bar:~$ sudo ./waveshare-poe-hat-b-cli oled "row1" "row2" "row3"
row 1: row1
row 2: row2
row 3: row3

foo@bar:~$ sudo ./waveshare-poe-hat-b-cli oled "row1" "row2" "row3" "row4"
row 1: row1
row 2: row2
row 3: row3
row 4: row4

Enable I2C Interface

I2C interface is required for the OLED display, you need to first enable the i2c interface for properly work. Open a terminal of Raspberry Pi and configure:

foo@bar:~$ sudo raspi-config
Interfacing Options -> I2C -> Yes

And then reboot the system.

foo@bar:~$ sudo reboot

Compile

foo@bar:~$ ./make clean
foo@bar:~$ ./make

References

Documentation https://www.waveshare.com/wiki/PoE_HAT_(B)