User:Bertrik Sikken

User info Bertrik Sikken
Name	Bertrik Sikken
Nick	bertrik
Tagline	heb ik niet

Studied Electrical Engineering at Twente University.

Main interests:

• reverse-engineering things (USB stuff, mp3 players), working on http://rockbox.org
• studying bats and making electronics for recording/listening to bat sounds
• software-defined radio

Old project ideas:

• do cool stuff with NRF24L01+ modules, e.g. connect one to the SPI bus of a Raspberry Pi
• experiment with MQTT, a light-weight publish/subscribe framework for telemetry data
• put the things above together in some kind of home automation project
• build a colinear antenna out of RG-6 coaxial cable for the 70cm band (for receiving high-altitude balloons)
• more radio stuff with the ham-it-up
• implement dominoex/thor radio mode for a balloon payload, perhaps build a light-weight reusable library
• come up with an algorithm to determine position/direction of bats as they pass a set of ultrasonic microphones, see StereoBatRecorder
  • I've tried direct correlation, works but sometimes gives errors on bat calls with little frequency sweep
  • Planning to try correlation of only the amplitude data (derived with a Hilbert transform)

New project ideas:

• Use two old satellite dishes to allow speech to be transferred over some distance
  • Figure out focal point
  • Create some kind of dish mount
• Reverse engineer the digital oscilloscope at revspace
  • Figure out screenshot image format
  • Try to find if there are other commands than the "send screenshot" command
• More LedBanner audio visualisations
• Create a RFM69HW TNC, based on code by flok
  • Remove 'flok' framing, make it comply with KISS protocol
  • Use 'infinite' package length mode to send typical TCP/IP frames (1500 bytes)
• Create a 'HabAlert' android app
  • Goal: get a notification on your smartphone when a highaltitude ballon (HAB) is coming into reception-range
  • How:
    • use a dedicated machine to retrieve current HAB positions from spacenear.us or habhub.org
    • keep track of HabAlert subscriptions, check notification conditions and send out notifications
    • use (for example) google cloud messaging framework to send push notifications that are quick and low-power
    • android client application receives notification, shows current HABs in either list (sorted by 'visibility') or map