AltiPi

Basic Altimeter logger for SF11/C laser range finder.

• Using Raspberry Pi Zero
• Trigger on specified pin interrupt
• Retrieve Altitude via serial port
• Log Altitudes.

REQUIRES:

• Rasbian Stretch 4.14
• wiringPi library installed system wide.
• libterraclear: Clone https://github.com/terraclear/libterraclear into the same root folder as this repo

HARDWARE:

A Raspberry Pi Zero, wired up as follows: Lightware SF11 Laser Altimeter whose RX line is attached to TX, TX line is attached to RX, connected to 5 Volt power and GND. Camera trigger line connected to pin #21 Red LED connected to #24 and GND. Green LED connected to #21 and GND.

RASPBERRY DEPLOYMENT NOTES:

• SSH: user=pi, password=terrapi123
• Deploy altipi binary to /altimeter
• Create a system.d service for altipi and register service (see /altipi.service in repository.)
• Mount FAT partition on /media/data through /etc/fstab

• PARTUUID=4955b1f2-03  /media/data     vfat    defaults,umask=007,gid=100 0 0
  

• In mounted FAT partition, Create folder "altimeter"

• /media/data/altimeter
  

DEPLOY SYSTEM.D SERVICE

• deploy altipi.service file to /lib/systemd/system/altipi.service
• Ensure rights are 644:

• sudo chmod 644 /lib/systemd/system/altipi.service
  

• configure system.d:

• sudo systemctl daemon-reload
  

• sudo systemctl enable altipi.service
  

• reboot

VALIDATE RELEASE

On startup, expect ps -A | grep altipi to find a running process. Expect /media/data/altimeter to contain altimeter.log and altimeterdebug.log. Expect green LED to turn on. Expect altimeterdebug.log to contain readings and continuously grow.