Hello PaulS,
PaulS:
Is the Bluetooth 4.0(Ble) backwards compatible?
Who's device? Backwards compatible with what?
I am trying to connect my BLE shield to previous versions of bluetooth, for example: my iphone 4 is Bluetooth 2.1.
Is there one Bluetooth that will connect with all of them?
What is them?
Them is existing bluetooth's.
Is it a programming problem or just hardware?
I'd say that almost certainly the answer is yes.
So would i be able to connect the shield i bought to my iphone if i simply make the right program?
Where can i find a Bluetooth shield for the UNO that will connect with any existing Bluetooth's?
I think that expecting to find a bluetooth module that will connect with ANY other bluetooth module is a bit unrealistic.