A Raspberry Pi or similar Single Board Computer (SBC) can also be used, as long it has a serial port for talking to the RockBLOCK. If you want to use the CircuitPython library, you'll also want to use a SBC that has Blinka support.
You can use any Raspberry Pi. However, since the remote location will likely not have WiFi and power will probably be a premium, the Pi Zero is a good option.
Wiring
Here's the wiring diagram. If you use the accessory cable, you should be able to match the colors. But it's also best to verify actual pin location on the RockBLOCK.
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* Yep, TX to TX and RX to RX. The RockBLOCK uses backwards nomenclature for its TX/RX pins.
Enable Serial
Follow these steps to enable serial on the Pi's GPIO header. The general process is to enable the serial hardware AND remove the default login shell that would otherwise use it.
You can do all this via raspi-config.
sudo raspi-config
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Install CircuitPython Library
See here for information on how to install Blinka to allow using CircuitPython libraries with Python on the Raspberry Pi:
and make sure you have passed the Blinka Test.
Then, install the RockBLOCK library with:
pip3 install adafruit-circuitpython-rockblock
Run Simpletest Check
As a quick test to make sure you are connected and talking to the RockBLOCK, use the simpletest example from the library. Here's the code.
# pylint: disable=wrong-import-position
# CircuitPython / Blinka
import board
uart = board.UART()
uart.baudrate = 19200
# via USB cable
# import serial
# uart = serial.Serial("/dev/ttyUSB0", 19200)
from adafruit_rockblock import RockBlock
rb = RockBlock(uart)
print(rb.model)
We need to make some changes first.
Comment out these lines:
uart = board.UART() uart.baudrate = 19200
so they look like this:
# uart = board.UART() # uart.baudrate = 19200
and add these new lines:
import serial
uart = serial.Serial("/dev/serial0", 19200)
and now your UART is talking on the Pi's GPIO header.
Try running the example:
and you should see the model information text printed out as shown above.
Additional Examples
The only change that should be needed for running other examples is to make the changes for configuring the UART. Once you've done that and passed that UART to the CircuitPython RockBLOCK library, the rest should just work.
Check out the other examples in the library repo.
