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Adafruit have a library as well
Integrated crystal that compensates for temperature and age
"Leave Me Alone Box" and others
You can even soft-PWM for full speed control
connect the DIN connection to the first shield's DOUT
Adafruit FONA 808 Shield - Mini Cellular GSM + GPS for Arduino WiFi Adafruit have a library asCellular + GPS tracking, all in one, for your Arduino? Oh yes! Introducing Adafruit FONA 808 GSM + GPS Shield, an all in one cellular phone module with that lets you add location tracking, voice, text, SMS and data to your project, in Arduino shield format for easy use. Please note: The T Mobile GSM network which is shutting down in the USA over the course of 2020 and beyond, so please be aware these are not for long term usage in the USA! Please