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This project turns a innocent-looking ghost decoration into an ambush in wait for unsuspecting passersby. The basic idea is straightforward: whenever someone walks within a few feet of the ghost’s face, it blasts them with a terrifying burst of compressed gas. Continued…
If you read Grant’s Creepy eyes Halloween prop post, then you already know that several of us here at Pololu are working on Halloween projects. I based my project on a motion tracking Halloween prop tutorial by Jason Poel Smith that I saw last year on the Make magazine website. The concept is simple: make a Halloween prop mysteriously follow an unsuspecting person as they walk by. The tutorial by Jason Smith uses photoresistors to track a person by detecting their shadow and moving a servo with a Halloween prop attached to it. This works well, but there are a few things that I thought could be improved. Continued…
In the lead up to Halloween, I thought it would be fun to make some Halloween-themed props; in particular, I was interested in making something creepy. What first came to my mind was one of those creepy portraits with moving eyes. To change it up a little, I decided to use a mask instead of a picture (which I thought would make it easier to hide the electronics). Down at a local store called Halloween City I picked up a cheap mask and some plastic eyeballs (though a more crafty person might just make their own mask and eyeballs). I made sure the mask was a bit stiff because I needed it to hold shape without actually having someone’s face in it. For the electronics in the project, I grabbed two sub-micro servos, a Micro Maestro, and a 4.8V battery pack. If you don’t have jumper wires it might also be helpful to get a pack of those, but this build only uses one to jump battery power to the Maestro’s logic power. Continued…
The 2pi, built by Mark Moran, is a line following robot based on our 3pi robot. The 2pi uses our 100:1 micro metal gearmotors, motor brackets, 32mm wheels, 1/2″ ball caster, QTR-8RC reflectance sensor array, and U3V12F9 switching step-up voltage regulator. All those components are mounted to a chassis that was cut from PVC foam.
The robot uses a custom made PCB with an ATmega328 as the brain (the same AVR chip used in the Arduino Uno, some of our Orangutan Robot Controllers, and, of course, the 3pi). You can see the 2pi following a line in the video below.
For more information about how Mark built his robot, check out his Instructables guide.
Pololu forum member spiked3 recently shared a sophisticated robot he made called RoboNUC. It uses a Netduino and a LIDAR module and was intended to help him learn simultaneous localization and mapping (SLAM). SLAM is a technique used to map an unknown environment and keep track of the device’s location within the environment. Using SLAM, the robot is able to characterize the surrounding areas without needing to physically navigate them. RoboNUC uses our 1″ plastic ball caster, and the acrylic chassis was laser cut using our custom laser cutting service.
Heikki Leivo and Matti Koljonen are currently working together to develop a miniature autonomous electric boat, which they are calling Leviathan. The boat is made of polystyrene foam, uses brushed DC motors and servos for movement, and is controlled by a Raspberry Pi, which reads data from GPS and a MinIMU-9 inertial measurement unit for navigation. Leviathan is equipped with a camera and also features a D24V6ALV step-down regulator for powering servos and other electronics. The boat is also controllable over WiFi.
|The electronics inside Leviathan.|
Matti and Heikki plan for their vehicle to be able to run pre-defined routes, capture photos, and record video, among other things. You can learn more about Leviathan on its website.
Robert Stephenson (blobbington) posted about his robot dinosaur, Roboceratops, on the Trossen Robotics forums. Roboceratops is a small robotic dinosaur built to resemble a member of the Ceratopsian group. It uses a total of 14 servos for movement that are commanded through two of our Mini Maestro 12-Channel Servo Controllers, which are controlled by serial commands from his custom hand held controller. The controller is directly wired to Roboceratops and uses an Arduino Mega 2560, an LCD screen and two 3-axis joysticks. Robert wants to improve his design by making it wirelessly controlled and battery powered, and he plans to eventually make Roboceratops autonomous.
Roboceratops is mainly constructed out of laser cut MDF, but the legs are made from aluminum square bar. Upholstery foam was added to the legs to make them look more like real legs. The case of the controller and the neat carrying case at the end of the video also appear to be laser cut.
Forum user Erich uses our Zumo chassis as a platform for teaching robotics, but instead of using the Zumo shield, he has been making his own custom electronics that let it do many more things. One of his most recent projects, which he describes in this forum post, involves a control board he designed that uses a Freescale ARM Cortex-M4F running at 120 MHz. He says it is capable of running WiFi, USB, GPS, and processing encoder signals in real-time.
Erich also used the ElecFreaks’ joystick shield to run his modified Zumo, which sounds like a lot of fun! For more information on this project, including some of the problems he had to overcome to get it all working, see this forum post or visit Erich’s website.
Erich has posted to our forum about his projects before; you can find a list of the forum posts he made that we blogged about below:
March 2013: Zumo Robot with FRDM-KL25Z Board
September 2013: Zumo Robot with Pololu Plug-in Modules
October 2013: Zumo Robot with Pololu Plug-in Modules, assembled
December 2013: Zumo Tournament Videos
We mentioned it in passing in an earlier post, but we think that the Firetail UAV System deserves its own post. Since then, Firetail’s creator, Samuel Cowen, has continued to develop this open-source UAV autopilot system, posting regular updates on his blog and sharing his project on the Pololu forum.
Firetail is designed to be installed in any fixed-wing RC airframe and autonomously fly up to 512 waypoints. The system includes software for a ground control station, which allows users to see the location, speed, altitude, and orientation of the aircraft. Users at the station can also upload and download autopilot settings and plan flights using Google Maps.
To test Firetail, he built his own RC aircraft, which uses an Arduino Due to process signals from an RC receiver, and reads data from an AltIMU-10. Depending on how the user sets up the autopilot mode, the Firetail system either flies the craft, or simply allows the user to fly the craft while streaming telemetry data to the ground control station.
You can learn more about the Firetail system on its website.
TwoPotatoe is a customer-built balancing robot that in its latest form uses an Arduino Mega to receive commands from a custom-made controller via XBees and a Wixel to wirelessly send telemetry to a PC. The robot uses feedback from a MinIMU-9 v3 IMU module’s accelerometer and gyro to maintain its balance, and it uses the MinIMU’s compass to navigate. The drive system consists of two 37D mm metal gearmotors with encoders controlled by a VNH3SP30 motor driver carrier. Check out the video below of TwoPotatoe in action:
You can read more about how TwoPotatoe works in the how it works section of its site.
10 December 2014 update: The old video of Twopotatoe has been replaced with a newer one. TwoPotatoe has also undergone a few changes: Arduino Due instead of the Arduino Mega, new motor controllers, new personality, etc. For more information about the changes and to see some new pictures, check out TwoPotatoe’s website.