無(wú)線健身和醫(yī)療監(jiān)控系統(tǒng)的連通性選項(xiàng)

　　由于健身監(jiān)視器今天風(fēng)靡一時(shí)，無(wú)線連接有許多不同的選擇。針對(duì)消費(fèi)者的健身帶使用的是藍(lán)牙低能量連接到智能手機(jī)的最新版本，但也有許多其他方式提供連接到健身帶，也作為一個(gè)無(wú)線病人監(jiān)護(hù)儀。

　　作為傳感器平臺(tái)本質(zhì)上是相同的心跳和血壓監(jiān)測(cè)添加到一般的運(yùn)動(dòng)跟蹤，長(zhǎng)距離低功耗的無(wú)線鏈路可以提供顯著更長(zhǎng)的電池壽命為帶，減少了需要補(bǔ)給系統(tǒng)，使更完整的數(shù)據(jù)捕獲能力。這些可以與網(wǎng)關(guān)，它提供了一個(gè)恒定的鏈接，而不是依賴于手機(jī)的連接，提供了一個(gè)更可靠和完整的數(shù)據(jù)收集架構(gòu)。這種可靠的無(wú)線鏈路變得越來(lái)越重要，因?yàn)閿?shù)據(jù)可以直接發(fā)送到云存儲(chǔ)和分析，而不是被下載時(shí)從顯示器充電時(shí)。

　　As medical and fitness monitors do not require high data rate connections， the wireless link bandwidth can be traded for longer range and lower battery life， allowing significantly more data collection before the monitor needs recharging.

　　The Flex Gecko family of wireless controllers from Silicon Labs provides both 868 MHz sub-GHz and 2.4 GHz connectivity with the necessary encryption to protect the data. The 868 MHz links provide a long-range capability to link to a gateway for the collection of data. The chip combines an ARM? Cortex?-M4 controller core， 256 kB Flash， 32 kB RAM and 31 digital I/O pins to link to sensors as well as seven 16-bit timers and multiple communication interfaces. The transmitter provides a 20 dBm maximum output power and a receive sensitivity of -121 dBm at 2.4 kbps， using 2 GFSK encoding and a 0.1% bit error rate （BER）。 There are multiple low-power modes for different levels of operation that help to keep the power consumption to a minimum. This is particularly useful in a medical monitoring device that will wake up every few minutes to take readings and transmit them to the gateway， and then go back into an ultra-low power sleep mode. Figure 1 shows the different power modes， where the majority of the chip is kept dormant until required to transmit or receive data.