Microprocessors in wearable Technology

Jayesh Sapkale
4 min readJun 1, 2021

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Hello, In this world of technology we are experiencing different innovations daily. There are different technologies available in our day-to-day life, like smartphones, laptops, smart Tv, etc and there is a lot of surge in wearable technology too.

There are different types of wearable devices available in the market like smartwatches, fitness bands, smart glasses, implantables, Head-mounted displays, AR VR tech.

So in this blog, we are going to see what are the internals of these devices, which microprocessors are used in these devices.

  1. Adafruit-Gemma:-

Specifications:

Ø Super small, only 1.1" / 28mm diameter and 0.28" / 7mm thick.

Ø Easy-to-sew or solder pads for embedding in your wearable project

Ø Low cost enough, you can use one for every weekend project

Ø ATtiny85 on-board, 8K of flash, 512 bytes of SRAM, 512 bytes of EEPROM

Ø Internal oscillator runs at 8MHz

Ø Ultra-low-power draws only 9 mA while running

Ø USB bootloader with a nice LED indicator looks just like a USBtinyISP so you can program it with the Arduino IDE (with a few simple config modifications)

Ø Micro-USB jack for power and/or USB uploading, you can put it in a box or tape it up and use any USB cable for when you want to reprogram.

Ø We worked hard on the bootloader process to make it rugged and foolproof.

Ø ~5.25K bytes available for use (2.75K taken for the bootloader)

Ø On-board 3.3V power regulator with 150mA output capability and ultra-low dropout.

Ø Power with either USB or external output (such as a battery) — it’ll automatically switch over

Ø On-board green power LED and red pin #1 LED

Ø Reset button for entering the bootloader or restarting the program.

Ø 3 GPIO — The 3 independent IO pins have 1 analog input and 2 PWM output as well.

Ø Hardware I2C capability for breakout & sensor interfacing.

-Pinout:-

-Click the below link to purchase this item:-

https://www.amazon.in/Adafruit-Gemma-Miniature-Arduino-like-Electronic/dp/B00GEDHO1U/ref=sr_1_1?dchild=1&keywords=adafruit+gemma&qid=1622536907&sr=8-1

2. Lilypad Arduino:-

Specifications:

Ø Microcontroller: ATmega32u4

Ø Flash memory: 32 kB, of which 4 kB are used by the bootloader

Ø SRAM: 2.5 kB

Ø EEPROM: 1 kB

Ø Operating voltage: 3.3 V

Ø Input voltage: 3.8–5 V

Ø Digital input/output pins: 9

Ø PWM channels: 4

Ø Analogue input channels: 4

Ø Direct current per I/O pin: 40 mA

Ø Clock speed: 8 MHz

-Pinout :

-Click the below link to purchase this item:-

https://www.thingbits.in/products/flora-wearable-bluefruit-le-module?utm_source=google&utm_medium=cpc&gclid=CjwKCAjwtdeFBhBAEiwAKOIy51yTtCwWzl4M1NqBAnEYD_b7Zd6Dp2ZwGeNLfAeKrzpD2PUGOdf2vxoCGIYQAvD_BwE

3. Adafruit flora:-

Specifications:

Ø Battery input (JST): 3.5–16V (the regulator is MIC5225–3.3) with reverse polarity protection, 2A max rated connector. We recommend no more than 6VDC so that the 3.3V regulator does not overheat

Ø USB input: 4.5V-5.5V with 500mA fuse

Ø 3.3V output pad

Ø Clock speed: 8MHz

Ø Chipset: ATmega32u4

Ø VBAT output pad: the higher the VBAT JST input voltage and USB voltage (two Schottky diode connection)

Ø Current Draw: 8mA quiescent, another 2mA when the pin #D7 LED is on.

-Pinout:-

-Click the below link to purchase this item:-

https://www.thingbits.in/products/flora-wearable-bluefruit-le-module?utm_source=google&utm_medium=cpc&gclid=CjwKCAjwtdeFBhBAEiwAKOIy51yTtCwWzl4M1NqBAnEYD_b7Zd6Dp2ZwGeNLfAeKrzpD2PUGOdf2vxoCGIYQAvD_BwE

4. Tiny lily mini:-

Specifications:

  • Arduino and LilyPad Compatible
  • Washable
  • Robust Gold Finish — makes soldering easy and is non-corrosive
  • 8 I/O (4 Digital, 4 Analog / Digital) and 4 Power Sewtabs (2 for power, 2 for ground)
  • Sewtabs is 1.2mm in diameter, easy to use with standard conductive thread and needles
  • USB expansion header
  • Ultra-compact size and weight
  • 14.0mm (0.55 inch) diameter o
  • Max Height: 2.8mm (0.11 inches) o
  • Ultra-thin 0.61mm (0.024 inches) PCB o
  • Weight: .39 grams (.01 ounces) o
  • Atmel ATmega328P Microcontroller o
  • 32KB Flash, 2KB RAM, 1KB EEPROM o
  • 1.2mA (typical) @ 3V, 4MHz o
  • Clock speed: 8MHz o
  • 2.7V — 5.5V operating voltage

-Pinout:-

-Click the below link to purchase this item:-

https://www.fabtolab.com/tinylily-mini-processor

Ø Conclusion:-
Hence, we are using these microprocessors indirectly through wearable devices.
But now we are familiar with wearable technology microprocessors.
We have seen the specification, pinout, and pricing of these microprocessors

Ø References:-

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