The ON-STAGE app can be used to switch a Bluetooth LE attached LED sign on or off.
The LED sign has to be modified to use an HM11 BLE module provided by the building instructions at: http://blog.io-expert.com/remote-on-stage
More information at: https://io-expert.com/onstage
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The developer does not collect any data from this app.
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With Family Sharing set up, up to six family members can use this app.