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i'm trying to implement an application using a Bluetooth 4.0 module, and I wonder if using this application with an Iphone 3GS containing a simple Bluetooth 2.1 EDR module is going to enable me take advantage of the the low energy in my 4.0 module. Thank you for your answers
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Devices implementing only the low energy feature (branded Bluetooth Smart) will be backward compatible with Bluetooth 4.0 devices that also implement the low energy feature.
Yes! As we've previously discussed, all Bluetooth versions are backwards compatible. This means any Bluetooth headset will work with any phone, regardless of their versions. But do keep in mind that both devices have to run Bluetooth 5.0 in order to take full advantage of the new features it introduces.
Not if it is "Smart" The protocol of Bluetooth Smart differs from that of older, so-called "Classic" Bluetooth devices. Bluetooth Smart devices are not backwards compatible and will not recognise nor pair with older devices supporting Classic Bluetooth.
If you're wondering whether you should upgrade to a pair of headphones with the newest Bluetooth version, remember this: All Bluetooth versions are backward-compatible and can work with lower Bluetooth protocols. So, you don't need to worry about your new headphones not working with an older phone.
Bluetooth 4.0 is the standard, which includes both classical Bluetooth Basic Rate/Enhanced Data Rate (BR/EDR) and Bluetooth Low Energy (BLE, or Bluetooth Smart, which is a marketing name).
Compatibility depends on the the device and Bluetooth chip e.g. is it a BR/EDR only chip (Bluetooth 3.0), a BLE only chip or a dual-mode chip capable of both BR/EDR and BLE. A dual-mode chip can (until 4.1, at least) only operates in either BR/EDR or BLE mode for any given connection.
A dual mode chip, certified as Bluetooth 4.0, can and should be able to connect to a Bluetooth 2.1 chip, in BR/EDR mode.
A Bluetooth BLE (Bluetooth Smart) chip will not be able to.
First, you must clearly determine if your Bluetooth 4.0 module is only capable of BLE.
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According to Bluetooth 4.0 (ie BLE), there are two kinds of devices 1) A dual mode device , which support BR/EDR , ie Bluetooth 2.1 or 3.0 and same time it support Bluetooth 4.0 2) A BLE only device, which supports only Bluetooth 4.0
In general, sensors which supposed to be work in coin cell battery will be designed with BLE chipset and mobile devices will be designed with Dual mode chipset. So the mobile device can have interoperability with other BR/EDR device as well as it can connect and fetch data from sensors.
More over a BLE device can not communicate with a classic Bluetooth device[ BR/EDR or Bluetooth 2.1 device]
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