This example addon switches an LED when new images arrive. It can be used in normal operation, but there are better solutions to implement it if a GPIO package is also installed.
Unfortunately, the available GPIO packages all have dependencies where problems may occur during installation.
Therefore the switching of the LED was implemented via executing a system command using the gpio utility.
This should work on all Raspberry PI's. It is not very efficiently, but should be sufficient for demonstration purposes.
You must define the GPIO port for the LED to be switched in the configuration. Otherwise the addon will not be executed.
If you are not sure which GPIO port to configure, you can run the pinout tool. The number after GPIO is required.
To install the newImageLED addon example open a terminal and execute:
cd ~/TeleFrame
cp -R addons/examples/newImageLED addons/newImageLED
tools/addon_control.sh enable newImageLED
tools/addon_control.sh config newImageLED newLedGPIO <your LED GPIO port number>Then restart TeleFrame.
If you are using an Raspberry Pi 4B and want to try this example, make sure you have at least wiringPi version 2.52 installed.
To check the version use gpio -v.
You can use the following commands to update wiringPi:
WPI_DEB="$(mktemp)" &&
wget -O "$WPI_DEB" 'https://project-downloads.drogon.net/wiringpi-latest.deb' && sudo dpkg -i "$WPI_DEB"
rm -f "$WPI_DEB"The following configuration options are available.
| Name | Type | Description |
|---|---|---|
| newLedGPIO | number | required: GPIO port to use to switch the LED |
| blinkInterval | number | optional: duration in milliseconds during the LED is on or off |