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Wireless Communications/Bluetooth Android Scrolling LED Sign

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Question
Want to convert wired PC to rs232 programmable led scrolling message signs to Bluetooth Android smart phone  programmable LED Signs.  Looking for Bluetooth field installable hardware to replace current DB9 rs232 serial line level port on led sign controller board.  Bluetooth module will go inside of sign enclosure and must have built in antenna.    Any thought on method to handle the hardware requirements for this project?

Answer
Hello John
There are a number of approaches to build your wireless sign controller application.
One simple way is to get a pair of modules which link the RS232 via radio.  You can search for "wireless RS232 link" and find a number of those.  That will remote your RS232 wirelessly but not directly to Android.  
You can find similar modules to connect RS232 to Bluetooth, and there may be support for your Android platform on the smart phone.   You can create or customize an app to set up the sign message.  
If you want to get deeper into the project you can buy a module from a supplier like Digi-International and embed that in the sign end to create a Bluetooth or WiFi link to the smart phone.   You would then write code for the smart phone to operate the sign.   These modules are well supported by low-cost development kits.
Jerry  

Wireless Communications

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Jerry Hinshaw

Expertise

RF and microwave engineering, hardware and systems applications. Avionics, satellite, and terrestrial communications. Space communications and navigation, geo-location services via satellite and ground-based wireless systems. Systems integration of RF and wireless services. Electric Utility RF Smart Meter (SmartMeter) and Smart Grid wireless devices and networks. Utility Distribution Automation.

Experience

30 years experience in microwave and RF systems engineering, radio hardware design and development.

Publications
about 20 articles, 2 patents

Education/Credentials
BSEE MSEE Communications Systems

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