This report documents the transition of n3m0 the autonomous boat, originally a monohull designed for long-ish range water-quality measuring missions, to n3m02 the autonomous catamaran. The mission was to add a depth sensor to the boat so that it could survey the harbor at Cal Maritime. The harbor silts in pretty quickly and it is … Continue reading n3m02 the Autonomous Boat: Depth Surveys
revisited after 20 years! by Michael E. Holden This is a project I did in 2002 to make an autonomous car with a single GPS sensor. No compass or IMU, and it turned out that the GPS of the day only sent updates of position, speed, and heading every 2 seconds or so. The solution … Continue reading Low-Cost Autonomous Vehicles Using Just GPS
I built N4N1 to learn the details of the ardupilot sailboat firmware. I have had a few student groups building similar vessels at work, and thought it would be worthwhile to go through the exercise myself. Plus I had a boat gathering dust that needed a job. N4N1 uses the ardupilot sailboat firmware on a … Continue reading N4N1 the Autonomous Sailboat
Back in 2019 I made a remote controlled lawnmower. It is not a very original design, it follows closely the mower from Make Magazine and many other youtube videos, with some modifications to suit what parts I could get. I got an electric wheelchair and an electric mower second-hand, bought a speed controller and some … Continue reading Lawnie the Remote Controlled Lawnmower
This project documents how to make a windvane to sense the wind direction. It was designed for an autonomous sailboat but could be used in other applications. The structure is mostly 3D printed and uses a gopro mount to attach to the hull. The main sensor is a magnetic encoder that outputs an analog voltage … Continue reading Electronic Windvane
This is mostly just to link the video I made. It shows how to run mission planner (ground control station) and start a simulation of an autonomous sailboat (SITL), and how to run the boat in autonomous modes, including tacking parameters and geofencing. Enjoy! https://youtu.be/kzGciG7cCBc
Using ardupilot with a telemetry radio to send data to your groundstation is the easiest setup and works very well. It is limited by RF range, which is determined by the radio power (more power gives more range but costs more and may require a ham radio license). The range also depends on good line-of-sight … Continue reading Ardupilot with Mobile Data Telemetry
Dumbo is an autonomous research vessel constructed by students at Cal Maritime. Dumbo carries temperature, salinity, and dissolved oxygen sensors and makes oceanographic observations in the waters off of the Cal Maritime Campus. This work has been supported by the CSU Council on Ocean Affairs, Science & Technology (COAST). Dumbo is guided by an Ardupilot … Continue reading Dumbo the Autonomous Boat
I have been documenting the build of n3m0, my latest autonomous boat over at hackaday.io. It has been pretty successful so far, here are some links: The project page. I won $1000 in the hackaday prize! Actually $2000! Feature on hackaday.com Feature on hackster.io Someone else is already building another one
If you're looking for my old site, sorry it got hacked and had to be put down. You can email me (mholden at csum dot edu) if you are trying to find something specific.