SquareWear 2.0 is an open-source, Arduino-based wearable microcontroller board. It is small, low-cost, and provides an all-in-one solution for wearable as well as general-purpose electronics projects.
At heart SquareWear is an Arduino running at 3.3V and 12MHz. It has large pin holes suitable for sewing with conductive thread, soldering with wires or sew-on snaps, and they are great for touch sensing too. SquareWear is packed with useful components. It has an on-board mini-USB port for uploading a sketch, charging Lithium battery, and creating serial communication. It’s preloaded with an USBasp bootloader. No external programmer is needed. It has a color LED, a general-purpose push-button, a buzzer, a light sensor, a temperature sensor, and N-MOSFETs to drive high-current load. In addition, it has a built-in LIR2032 rechargeable lithium coin battery, so you can power your projects right away without any external power supply. Every time you plug in the mini-USB cable, it charges the coin battery automatically. If needed, you can also plug in an external LiPo battery through the on-board battery jack. It’s perfect for building wearable as well as general-purpose microcontroller projects. It’s great platform for learning Arduino programming too.
Note: unlike the standard Arduino, SquareWear does not have a USB-to-serial chip. Instead, it simulates USB functionality in software using the V-USB library.
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ATmega328 running at 3.3V, 12MHz, pre-loaded with USBasp bootloader.
XC6206P332MR 3.3V / 250mA LDO.
TP4057 Lithium charging chip and charging indicator LED.
MCP9700 temperature sensor; 10K LDR (light sensor).
8.5mm SMT buzzer; 6mm SMT tactile button.
2.0mm JST connector for external lithium battery.
2N7002 MOSFETs, SMT mini-USB port, and power switch.
5mm color (RGB) LED.
LIR2032 (20mm) rechargeable lithium coin battery (45mAh capacity).
SquareWear 2.0 User Manual
SquareWear 2.0 Github repository
Comparisons of SquareWear 2.0 with LilyPad USB and Flora
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