When people talk about Bluetooth dual-mode, two modules from Microchip might come into the conversations. BM78 & RN4678. But what’re the differences between these two modules?
The primary difference between the BM78 and the RN4678 is how the module is configured. The BM78 is configured through a Windows GUI or directly via UART by a microcontroller. The RN4678 is configured with standard ASCII commands via UART.
Is there any other module that’s better?
Yes! BT909 is definitely a strong competitor to them. BT909 is also a Bluetooth 4.2 dual-mode module, it has much higher output power, longer cover range, more interfaces, an even lower price. We made a full comparison down blow so that you could see things more clearly.
|Bluetooth Version||Bluetooth 4.2 dual-mode||Bluetooth 4.2 dual-mode||Bluetooth 4.2 dual-mode|
|Output Power||2 dBm||1.5 dBm||18.5 dBm|
|Cover Range||Up to 10 meters||Up to 10 meters||Up to 100 meters|
|Data Throughput||Up to 32Kbps BR/EDR
Up to 7Kbps LE
|Up to 32Kbps BR/EDR
Up to 7Kbps LE
|Up to 80KBps SPP
Up to 60KBps GATT
|Interface||UART, etc.||UART, etc.||UART, I2C, PCM/I2S, etc.|
|Certifications||CE, FCC, etc.||CE, FCC, etc.||CE, FCC, etc.|
|Unit Price||Less than US$9.6||Less than US$9.6||Less than US$7.2|
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Post time: Dec-27-2019