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Both of them focuses on very different areas
The Temperature & Humidity Capacitive Digital AM2301 DHT21 Sensor is a temperature and humidity sensor with 1-wire designed for climate logging
Product PIR Motion Sensor HC SR505 Category proximity presence sensors Wiring & usage notes
Pi 2 and Pi 3 have landed on the Maker World like a 40-GPIO pinned
45 in (Nominal PG-7) Material Nylon 66 with rubber seal insert Color WHITE Weight 4
Adafruit FONA 808 Mini Cellular GSM + GPS Breakout Board fona 808 Both of them focuses onAdafruit FONA 808 Mini Cellular GSM + GPS Breakout is an official Adafruit product available from Circuitrocks, an official distributor of Adafruit. A compact cellular breakout that combines GSM, SMS, voice, GPRS data, and GPS capabilities in one board. Why choose this Adafruit board or module? Combines GSM and GPS on one module Useful for trackers, SMS devices, and remote projects Compact breakout form factor What you can build GPS trackers, SMS
