How to connect SAMD (Adafruit RFM95x) to SIM7000

Hi there,

Those pin definitions in Arduino IDE define the microcontroller pins you will be using. For example, "RST" will be pin 7 on the microcontroller, DTR will be pin 8 on the microcontroller... Maybe the name "BOTLETICS_PWRKEY" is a bit confusing and I should change it.

One thing you need to notice is that the Adafruit Feather M0 with RFM95 board has LiPo battery charging circuitry. Since the Botletics SIM7000 shield has LiPo charging as well, you will want to just use the LiPo charging on the Adafruit Feather. However, you will still need to tether the LiPo battery voltage to the VBAT pin on the shield (NOT 3.3V).

So to summarize the connections you will need:

Feather M0 --> SIM7000 shield

• Connect LiPo battery to the Feather's JST connector
• GND -> GND
• BAT -> VBAT to actually power the SIM7000 module with the LiPo battery
• 3.3V -> 5V so that the SIM7000 operates on 3.3V logic voltage
• Any TX pin on Feather --> Shield RX (marked "11"). Feather's TX pin to be defined in code
• Any RX pin on Feather --> Shield TX (marked "10"). Feather's RX pin to be defined in code
• SCL/SDA if you want to use the temperature sensor
• Feather GPIO --> Shield pin 6 (PWRKEY pin). Define Feather GPIO in code

No, only one sketch. You only need to define the pins on the microcontroller (Feather M0) because that's what you're sending the code to. The pins on the SIM7000 board only guide you how to connect the microcontroller to the SIM7000. The SIM7000 shield was designed to sit on top of an Arduino Uno, so in that case, the pin definitions for Arduino in the code are the same as the physical pins you use to connect to the shield. But here you're using a different microcontroller so you just need to change the pin definitions for your microcontroller.