In some company canteens it makes sense to only open refrigerators when a payment has been made. This can be implemented via a USB relay. The following relay has been tested so far: Relay Module.
To put the relay into use, the following steps must be carried out in the kiosk settings:
To get into the settings, double-tap the version number and enter the password 1234567890
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Open Settings
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Select the Fridge tab
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Select the USB device representing the relay
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Set the opening time (default: 10 sec)
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Save & connect (important: if the time is changed later, you must perform Disconnect and Save & Connect again)
The test opens the relay for the set time and then closes it again.