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from Instructables.com

Home automation system using Arduino and SIM900 GSM module

The Arduino community has created a wide variety of modules and shields that can enhance your projects. Here’s the ultimate collection of 21 Arduino Modules that you can get for less than $2 …

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A $20 Heart Rate Module For Health-Tech Projects - Electronics-Lab

from Pimoroni

Adafruit Feather M0 Bluefruit LE

Adafruit Feather M0 Bluefruit LE - This is the Adafruit Feather M0 Bluefruit LE - Adafruits take on an 'all-in-one' Arduino-compatible + Bluetooth Low Energy with built in USB and battery charging. Its an Adafruit Feather M0 with a BTLE module