If the hotspot in the consumer electronics market is that the hotspots in the consumer electronics market are the transition of the mobile phone to the smart machine, then it is gradually shifted to the portability of smart devices, intelligent. In recent years, Haojie at home and abroad has focused on intelligent hardware, Google Glass came out, Galaxy Gear attids ... This year, the APPLE Watch's debut is more pushing this hotspot to higher.
During this time, the ewistech dismantling center (www.ewisech.com) also evaluates a lot of intelligent hardware, especially various wearable devices, we find smart bracelets, smart, health and other labels, wrist Teling actually did not imagine "tall", throwing out of the shape, the same as small as the app, in principle of core hardware, they are very similar. A formula can be made basic, microcontroller or MCU + low power Bluetooth communication scheme + inertial sensor + power supply scheme. Basic principles are simple, an MCU or processor (built-in or additional small capacity RAM, ROM) controls Bluetooth, sensors, LEDs, and vibrators. Button battery or lithium battery supplies power.
Millet bracelet
Let's take a look at the domestic 79 yuan millet bracelet.
The split design taken by the millet bracelet, the wrist strap can be separated from the body. The internal structure of the main body is also very simple, and the front and rear classes are embedded in the middle, the motherboard and the vibrator, the charging contact design is on the housing.
Circuit board, main IC, DIALOG DA14580 Bluetooth, built-in 32-bit ARM Cortex M0 kernel, has a power management module; Adi ADXL362 3-axis digital output MEMS accelerometer, TI TPS62736 buck converter.
Fitbit flex
Fitbit flex is also a split design, wristband and body can be separated. The main body part of the outer casing is very tightly used, and a large amount of glue, charging contacts and Bluetooth antenna are designed on the plastic housing. The hardware in the shell is a vibrator, a circuit board, and a rechargeable lithium battery. An NFC is also posted on the motherboard, but because the bracelet does not have NFC-related functions, the actual role of this NFC coil is not understood.
The main IC on the motherboard is the STM32L 32-bit microprocessor, an intention-semiconductor Lis3DH three-axis acceleration sensor, Nordic NRF8001 Bluetooth 4.0 chip, and a lithium battery charging chip of Ti BQ24050.
Jawbone
Next, look at the Jawbone's UP bracelet. Jawbone is one of the manufacturers who entered the smart bracelet. The two generations of UP braces are also very popular in the market. The two generations of UP are typical integrated design, which represents a relatively high process standard.
The flexible panels used by the board, all of the electronic devices are all on the soft board, and the battery is sealed in a metal small box, which is a soft TPU rubber, which can ensure the flexibility of the bracelet, and prevent the battery. Squeezed damage, and the IC on the motherboard uses high strength dispensing, and the coverage area is large, and the stability of the motherboard is further ensured. The main use of ICs have a microcontroller of Ti MSP430F5528, Nordic NRF8001 Bluetooth chip, Bosch BMA222EF three-axis acceleration sensor.
Misfit SHINE
Further, it is also possible to capture many users of Misfit SHINE in exquisite shape, and also the design form of the main body and wristband separation. Two-piece metal housing, built-in button batteries and a board. Disassemble, Ewistech Engineer thinks that the brightestness of this bracelet is industrial design outside its core circuit, a small metal case, 12 LED lights can be simple display time, and there is magnet and clips on the entire body. Diversified wear pattern.
Misfit Shine round black motherboard, the periphery is 12 LEDs. Taken over the motherboard, its solution is also MCU + Bluetooth and an acceleration sensor. Models are Silicon Labs EFM32, 32-bit ARM kernel MCU, Ti CC2541 Bluetooth 4.0 chip, built-in 128KB ROM, and 8KB RAM.
NIKE Fuelband
Nike Fuelband smart bracelet, also integrated design, dismantling, you need to cut from the wristband surface. Since the entire bracelet is made into an arc, the entire circuit motherboard is a flexible plate, which is naturally better than the hard board, and the boss is a 5 * 20 LED array. It is worth mentioning that Nike Fuelband uses two 36mAH lithium batteries design, but the battery life is not strong, only about 5 days.
The IC on the board is mainly distributed at both ends. Used, STM 32L151QCH6 MCU, built-in 256 kb flash memory, integrated semiconductor LIS3DH three-axis acceleration sensor, CSR Bluetooth 4.0 chip CSR1010, integrating semiconductor STNS01 lithium battery charging chip.
Bong
BONG generation, taken is also integrated design, wristband, aluminum alloy decorative housing, chip plastic housing, and main boards, batteries, and vibrators in the shell.
On the board, the Bluetooth SOC of Nordic NRF51822, which is a high frequency of the sensor, and the sensor has a high frequency of the SS3DH acceleration sensor. Liner LTC4065 charging chip and Ti LM3673 antihypertensive converter, strengthen power.
Finally, the ewisetech dismantling center (www.ewisetech.com) Some summaries of bracelets have been removed from these functions, the differences between the hardware parameters, the difference between the ring rings is not large, and the only way to see Bong during the battery life. The second generation can reach around a year, and it is a breakthrough. The price difference is relatively large, and the millet bracelet is opened and about 20 times the difference.
(Click on the picture to enlarge)
In addition to the bracelets we have dismantled, there are still a lot of bracelets in the market. Due to the simple plan, the threshold is relatively low, the development cost is also low, the development cycle is also short, so the smart wear market is still more chaotic. But as far as our trial situation, the current smart bracelets have a large distance, industrial design, sensor, display, power consumption, and interaction, it needs to be improved. We believe that as the next generation portable electronics, the experience should be a fool, the industrial design should be fashionable, wearing, can truly collect valid data and manage value-added services.
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