Combined with a GPS module and an Arduino with an SD card, the rig can keep track not only of how much water is below it, ... boat, gps, matplotlib, nmea, python, sonar, ultrasound. Post navigation.

To fix this, I manually installed matplotlib (apparently only the older version works - 0.99.1.1). Boom. That did it. Now I can load both visual and pylab modules at the same time.

The Arduino library is available on Github, and you can order a SI5351 breakout board from OSHPark. Posted in Arduino Hacks, Radio Hacks Tagged arduino, clock, PLL, radio, SI5351.