有人用過 RN4871 這個模組嗎?
照著範例做功耗一直都維持在15mA
試過 "O,0" 跟 "SO,1"
但是這樣就沒辦法隨時傳送資料了
要怎麼進入可以隨時傳送又能維持功耗在uA級?

The only way to drop power consumption to uA is to use low power mode by issuing "so,1" command. When the module is in low power mode, the Bluetooth is still connected but the UART is off because the system is running 32k clock. The module is drawing about 60uA while connected to another BLE device in this mode.

You can still receive data from BLE radio in low power mode. When data comes in from BLE radio, BLE radio will wake up CPU automatically and send received data to UART.

The tricky part is to send data to the module. You need to pull UART_RX_IND pin low and wait for 2 milli-second before you can send data to the module.

2mS is a very short time and is OK for most applications. If you need to have low power connected mode, this is the only way. All you need to wait is 2 mS and you can save 15mA power consumption. Again, the Bluetooth radio is connected in low power mode, all you need to do is to pull UART_RX_IND pin low and wait for 2mS. If your application can tolerate the 2mS delay, you should use the low power mode by issuing "so,1" command.

Let us know if you need further help.

Hi cyshay,
下了 "so,1" 後，要等待30秒才會進入低功耗模式。我的應用是100ms傳送一次，所以模組會一直保持在高耗能。還有其他的方法嗎?

也許你需要 zigbee ...

以下網路資料自行參考:

http://iknow.stpi.narl.org.tw/post/Read.aspx?PostID=10327
一直以來，智慧家庭的通訊標準之中WiFi與Zigbee互相競爭的態勢相當明顯，WiFi憑藉著高市佔率與普及率人氣歷久不衰，Zigbee則是挾持著802.15.4各項特性成為這幾年相當熱門的通訊技術；藍芽相比之下較為弱勢，但因高安全性且Bluetooth 4.1技術崛起而仍佔有一席之地。


在相同的電池電力下:
wifi只能用數小時
bluetooth可用數日
(另有其他網頁提到bluetooth 4.0有低功耗,
鈕扣電池也可用數年之久....)
zigbee 可用數年