Ths repo containts the software to implement a data-logger in Julia for an ocean surface drifter which also communicates the data over the cell phone network.

Table of contents:

1. 💾 software installation
2. ⚡ reduce power consumption
3. 🚨 blinking leds
4. ☎️ GSM modem
5. ⚙️ configure drifter-diy.jl
6. 🌊 notes for deployment
7. 💻 Analysis of drifter data with the sample data and bathymetry.

Switch on/off

• Connection via ssh

sudo shutdown -h now

Wait that green led is off, then disconnect power supply.

Start-up sequence

Approximate timings:

• 4 min: to boot Rasberry Pi (under-clocked, with only 1 CPUs)
• 30 s: start WaveShare Hat
• 1 min: wait (so that peak power consumption does not coincides with GSM network registration)
• 1 min: register to GSM network and send first SMS

Reference

• https://raspberrypi-guide.github.io/electronics/power-consumption-tricks
• https://www.dexterindustries.com/howto/run-a-program-on-your-raspberry-pi-at-startup/