User:Bertrik Sikken

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

You can reach me at bertrik@sikken.nl or bertrik@gmail.com

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
  • radio stuff, in particular software-defined radio


Projects I work(ed) on (refresh):

 Project Status
FrontDoorDisplayAbandoned
HabAlertAppAbandoned
IbmPosDisplayAbandoned
Pico TrackersAbandoned
WifiLampAbandoned
A4PaperDispenserCompleted
BuildStatusTrafficLightCompleted
CJMCU-811Completed
CO2MeterHackingCompleted
CrawlSpaceSensorCompleted
DecodingLoraCompleted
DustSensorCompleted
ElectronicLoadCompleted
EspNowSkipCompleted
IntakefancontrollerCompleted
LichtKrantCompleted
LoRaGatewayCompleted
LoraWanNodeCompleted
MHZ19Completed
MainsFrequencyCompleted
MiniSTM32F103ZECompleted
RC522HackingCompleted
RevRadioCompleted
STM32Completed
Secure iButtonCompleted
SoilHumiditySensorCompleted
StofradarCompleted
TTNHABBridgeCompleted
ZigbeeCoordinatorCompleted
AntiLostIn progress
AudioMothIn progress
CubeCellIn progress
EspAudioSensorIn progress
Esp32camIn progress
FMCWRadarIn progress
ISSOIn progress
LoraWanDustSensorIn progress
Sim7020In progress
StereoBatRecorderIn progress
StofAnanasIn progress
UltrasonicPlayerIn progress
EspNowAudioInitializing
LoraBatBoxInitializing
RadarOnAStickInitializing
CC2540Stalled
EncodingLoraStalled
EspWifiTrackerStalled
LaserCutterUsageCounterStalled
NurdPowerStalled
SolarBatLightStalled
... further results


Old 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

Project ideas for 2016:

New project ideas:

  • 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, see HabAlertApp
  • add opus audio codec support to squeezeboxserver and/or squeezelite
    • an opus web radio stream already seems to be redirected to the client, but squeezelite crashes on it
  • create code for remote control of my ZwaaiLicht
    • implement wireless protocol for the NOMZ message ("\x4NOMZ") on address 0x66996699L (no ack)
    • possibly implement a more capable protocol on a different pipe (with ack, learn about extra pipes on NRF24L01+)
    • possibly split control of the light and the motor
  • Experiment with an ESP8266 serial-wifi module, WiFiBat project plan:
    • attach an ESP8266 to a migrating bat and program it to record a list of wifi APs every day, so the location over time can be determined from the AP-list (use Mozilla geolocation service to convert from AP-list to location), main challenge: keep weight and power consumption low.
  • Create better algorithm for detecting heartbeat using this optical heart beat sensor: sample the analog signal at 100 Hz and do an autocorrelation to get a continuous estimate of the heart rate.
  • Play around with so-called LoRa (long range) RF modules. These modules have improved range owing to spread-spectrum modulation, error correction and 100 mW RF output.

Laser cutting: I would like to get more creative with the laser cutter, starting with cutting existing designs, for example: