Smart bracelets and wristbands don't actually have the imaginary "high on the top". They are abandoning the appearance and similar APPs. They are very similar in terms of core hardware principles. A formula can basically cover, microcontroller or MCU + low-power Bluetooth communication solution + inertial sensor product + power solution. The basic principle is simple. An MCU or processor (with or with small RAM, ROM) controls Bluetooth, sensors, LEDs and vibrators. A button battery or a lithium battery provides power.
Millet bracelet
The split design of the millet bracelet allows the wristband to be separated from the main body. The internal structure of the main body is also very simple. The front and rear two-piece housings are embedded with a battery, a main board and a vibrator in the middle, and the charging contacts are designed on the outer casing.
Board, main IC, Dialog DA14580 Bluetooth system-on-chip, built-in 32-bit ARM Cortex M0 core, with 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 with a wrist strap and body that can be separated. The body part of the housing is very tightly welded, using a large amount of glue, and the charging contacts and Bluetooth antenna are designed on a plastic case. The hardware inside the case is a vibrator, a circuit board, and a rechargeable lithium battery. There is also an NFC attached to the motherboard, but since the bracelet does not have NFC-related functions, it does not understand the actual function of this NFC coil.
The main ICs on the motherboard are STMicroelectronics STM32L 32-bit microprocessor, STMicroelectronics LIS3DH triaxial accelerometer, Nordic NRF8001 Bluetooth 4.0 chip and a TI BQ24050 lithium battery charging chip.
Jawbone's UP bracelet
Next, take a look at Jawbone's UP bracelet. Jawbone is one of the early manufacturers to enter the smart bracelet. The two generations of UP bracelets are also very popular in the market. The two generations of UP are typical integrated designs, representing a relatively high level of craftsmanship.
The flexible board used in the circuit board, all the electronic components are all mounted on the soft board, the battery is sealed in a small metal box, and a soft TPU rubber is on the outside to ensure the flexibility of the bracelet and prevent the battery. It is crushed and damaged, and the IC on the motherboard uses high-strength dispensing and a large coverage area to further ensure the stability of the motherboard. The main ICs used are the TI MSP430F5528 microcontroller, the Nordic nRF8001 Bluetooth chip, and the Bosch BMA222EF triaxial acceleration sensor.
Misfit Shine
Looking at the Misfit Shine, which captures many users in a sophisticated shape, is also a form of separation between the main body and the wristband. Two-piece metal case with built-in button battery and a circuit board. Disassembled, we feel that the highlight of this bracelet is the industrial design outside its core circuit. The compact metal casing and 12 LED lights can display the time in a simple manner. The magnets and clips are attached to the whole body to achieve various functions. Wearing mode.
Misfit Shine round black motherboard with 12 LEDs around. It is also marked by the motherboard, and its solution is also MCU + Bluetooth and an acceleration sensor. Models are Silicon Labs EFM32, 32-bit ARM core MCU, TI CC2541 Bluetooth 4.0 chip, built-in 128KB ROM and 8KB RAM.
Ni Nike FuelBand
The Ni Nike FuelBand smart bracelet is also an all-in-one design that requires cutting from the surface of the wristband when disassembling. Since the entire bracelet is curved, the entire circuit board is a flexible board, and the cost is naturally higher than that of the hard board. In the middle of the board is a 5*20 LED array. It is worth mentioning that Nike FuelBand uses two 36mAh lithium battery designs, but the endurance is not strong, only support for about 5 days.
The ICs on the board are mainly distributed at both ends. STMicroelectronics STM32L151QCH6 MCU with built-in 256kb flash memory, STMicroelectronics LIS3DH triaxial accelerometer, CSR Bluetooth 4.0 chip CSR1010, STMicroelectronics STNS01 lithium battery charging chip.
Bong
The Bong generation also adopted an integrated design, a wristband, an aluminum alloy decorative case, a chip plastic case, and a motherboard, battery and vibrator inside the case.
On the board, Nordic nRF51822's Bluetooth SoC, STMicroelectronics LIS3DH accelerometer, this sensor appears at a high frequency. The Liner LTC4065 charging chip and the TI LM3673 step-down converter enhance the power supply.
Finally, there are some summary lists of the bracelets that we have disassembled. From the parameters of these functions and hardware, the difference between the rings is not big. The only time to see the battery life of the bong second generation can be about one year. , is a breakthrough. The price difference is relatively large, and after the breakout of the millet bracelet, the price difference is about 20 times.
In addition to the wristbands that have been dismantled, there are actually many bracelets in the market. Because the scheme is simple, the threshold is relatively low, the development cost is low, and the development cycle is relatively short, so the smart wearable market is still quite chaotic. However, as far as the trial situation is concerned, the current smart bracelets are still far from mature, and the five aspects of industrial design, sensor, display, power consumption and interaction need to be improved. As the next generation of portable electronics, the experience should be foolish, industrial design should be stylish, non-inductive wearable, able to truly collect valid data and manage to provide value-added services.
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