User:Bertrik Sikken
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| 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