sdstate cubesat

sdstate-cubesat

New Raspberry Pi Set-Up

sudo apt-get update

Enable interfaces

sudo raspi-config

Enable Interface options VNC, I2C, SPI, Serial, etc.

(Optional) Install Remote Desktop

apt-get install xrdp

We also want to install some CircuitPython Adafruit libraries, since we're gonna use a lot of sensors from Adafruit, because they make their own drivers for them. Follow the instructions here: https://learn.adafruit.com/circuitpython-on-raspberrypi-linux/installing-circuitpython-on-raspberry-pi

Feather M0 Arduino IDE & Transmit/Receive Setup:

Download the Arduino IDE, go to preferences and add the URL below for Additional Boards Manager (click on the small icon on the side):

https://adafruit.github.io/arduino-board-index/package_adafruit_index.json

Click OK.

Now, go to the 'Tools' tab, mouse over 'Board:' and go to 'Boards Manager...' and install the following:

• "Arduino SAMD Boards"

• "Arduino SAMD Beta Boards"

• "Adafruit SAMD Boards"

Restart the Arduino IDE.

Now connect the Adafruit Feather M0 with USB and go to the 'Tools' tab, go to 'Board:' and pick 'Adafruit Feather M0'.

And that's it!

GPS Set-Up (Using Adafruit Ultimate GPS Breakout Board)

GPS	Raspberry Pi
Vin	3.3V
GND	GND
RX	UART TX
TX	UART RX

1. Set up minicom, so we can test out the UART ports.

sudo apt-get install minicom

2. Edit the /boot/cmdline.txt file, so that it looks like this: (We are simply deleting references to ttyAMA0) Here is what looks like on the current Raspberry Pi (may differ):

dwc_otg.lpm_enable=0 console=tty1 root=/dev/mmcblk0p7 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait splash plymouth.ignore-serial-consoles

(single line)

3. We can now test out what sort of data we are receiving from the UART serial port, but we first need to change the settings for the minicom:

sudo minicom -s

Go to serial port, change serial device to: /dev/ttyS0 Go to Bps/Par/Bits, change baudrate to: 9600

4. We also want to install the great NMEA parser from this link: https://github.com/inmcm/micropyGPS Follow the install instructions and set it up. Then, you'll be able to use lib_GPS

MPL3115A2 Sensor Set-Up

Sensor	Raspberry Pi
Vin	3.3V
GND	GND
SCL	i2c SCL
SDA	i2c SDA

First we gotta set-up the Raspberry Pi:

sudo apt-get install python-smbus
sudo apt-get install i2c-tools

Set up modules:

sudo nano /etc/modules

i2c-bcm2708
i2c-dev

Remove blacklists:

sudo nano /etc/modprobe.d/raspi-blacklist.conf

#blacklist spi-bcm2708
#blacklist i2c-bcm2708

The MPL3115A2 requires a repeated start command in it's I2C communication - the Raspberry Pi doesn't do this out of the box, but we can use a kernel module.

sudo su -
echo -n 1 > /sys/module/i2c_bcm2708/parameters/combined
exit

We will also use Adafruit's CircuitPython MPL3115A2 library, and once the Adafruit CircuitPython dependencies are installed above, we can install the sensor driver with:

pip3 install adafruit-circuitpython-mpl3115a2

Additional Reading:

• http://www.hobbytronics.co.uk/raspberry-pi-serial-port
• http://n5dux.com/ham/raspberrypi/igate.php
• http://www.rowetel.com/?p=5344
• https://github.com/antonjan/Raspberry_Telemetry
• https://hackaday.com/2018/05/02/raspberry-pi-is-up-up-and-away/#more-306026
• https://create.arduino.cc/projecthub/jweers1/arduino-aprs-tracker-wilderness-location-tracking-a50607
• https://www.sparkfun.com/news/389
• https://www.sparkfun.com/tutorials/185
• https://n1aae.com/raspberry-pi-aprs-direwolf-linux-igate-digipeater/