I am currently working on a project with classmates to modify and existing Duratrax Evader ST RC car. We would like to control the steering servo and motor that came with the car using an Arduino microcontroller. We are able to control the steering, but having problems with the motor. Please keep in mind I am a beginner.
I found this thread that talks about the speed controller that came with the car.
I also found somewhere that the max current ratings for this speed controller is 128A forward and 64A reverse.
We have not yet attempted to take the advice of the thread above. When it is attempted, I am wondering how the actual speed will be controlled if the duty cycles are for directional drive. Will the duty cycles have to be tweaked to get the desired speed? We... [Read More]
anyone know how to start to build our own basic atom pro 28 carrier board ??
without using Bot-board ll
i owned a bot-board ll
but i wanna learn more... anyone can help me??? please
i need to build my own carrier board for Basic atom pro 28... thanks...
I just finished up some work on using RoboRealm to guide my robot as it reaches toward a target object. The ultimate goal is for the robot to be able to pick up the object from a random location or take it from someone's hands. For now, I simply wanted to work out the coordinate transformations from visual space to arm space to get the two hands to point in the right direction as the target is moved about. The following video shows the results so far:
I don't have a full write-up yet on how I did this but it basically just uses 3-d coordinate transformations from the head angles and distance to the target (as measured by sonar and IR sensors mounted near the camera lens) to a frame of reference attached... [Read More]
So, I'm starting a new project at work - going to be doing some outdoor navigation research and development with Brainbot. The tracked chassis is not really suitable for that sort of thing, so we decided to mount the CPU/sensors on something a little more suitable for outdoor driving.
I went out and bought a 1/5 scale RC rock crawler chassis. Just for scale, those tires are 8" in diameter, and the whole thing is 30" long. We chose this chassis because it would have no issues going long distances at speed, and it would be... [Read More]
Hey everyone I just wanted to start a thread for my entry in MW 2010. I have been working on it off and on for about a year. The design has changed a lot from when I first started so it is really hard to say when I started on the current version. I took it to Toronto a few months ago for the walker comp and ended up placing third.
Jeff is a lizard type 3dof per leg quad. I am using AX-12s for actuation and an Arbotix for control. I am using Trendnet wireless camera for vision. The battery is a 2100 mah 3s Lipo. Right now I am planning on using one defender gun, but I am also considering using two tank guns.
I haven't had much time to work on it recently because I have been pretty busy with another robot but I hope to have some more work finished by the end of the month.
Here is a little video of my progress so far.
... [Read More]
I need help in understanding the present speed feedback (adresses 38 and 39 in the control table) of the Dynamixel AX-12+ actuators. Basically I'm not entirely sure what the numbers that I get from the feedback mean, if they contain information regarding the direction of rotation and if they do, how to make sense of it.
I'm currently working on PID control of Dynamixel AX-12+ servos. Things are going fairly well at the moment except that I seem to only be able to command the servos to rotate in ONE DIRECTION ONLY.
I'm programming the servos using Matlab and interfaced using USB2Dynamixel. The matlab code for controlling the speed of the servos are as follows:
where address = 32 (from control table, note that this refers to the lower byte only?)
I try to set the required speed to be of maximum magnitude i.e. 1023; The problem now is setting it to -1023 doesn't get it to rotate in the opposite direction.
(Note: setting the speed to -1023 using Dynamixel Configurator (a separate program) does make it turn in the opposite direction).
Thanks to the new “LinceoVR 3.3” interface, anyone can directly control and drive the WowWee Drone Rovio, enabling all users to create a personal experience online or offline of Augmented Reality.
There is a Maker Faire being held in the UK this year, 13th/14th March, if there are any UK members interested in helping with our booth, or just coming along to say hello and have a go with one, let us know.
I will be bringing a humanoid and an LM rover to play with.
Hello.
I am planning to make a biped for research.
I think the frame set is pretty much one or two time deal. So I am looking for a online prototyping shop to do it.
Our company orders SLA all the time, but I don't think it is good for my project, isn't it?
I don't know if the company will do bending too?
Or I just get alum sheet cut from a online prototyping shop, then buy a bending break?
You guys are fantistic, really want to know what do you currectly do for the brackets/frames?
Hey Guys.. I just wanted to show this off.. I didn't build these.. I asked gdubb2 to build them for me (I'm a bit sort on time these days).. I just want to say, he did a kick a$$ job on these and they're completely awesome.
I have two of them, and they're getting mounted to my bioloid humanoid for mech-warefare. They're just freaking awesome. BTW, my pictures don't do them justice either!
I've started a project to build a James Bond-esque kind of gadget to be used for a three day convention. It will have to be on a somewhat limited budget (both time and money) as I'm getting close to the finalization of an adoption. I'm planning to use a RC Crawler (that I have already) as a base for a Rocket nose cone like superstructure. I'll be using my 7 Channel RC system with expansion module (8 functions, 2 proportional and 6 3-position switches) for controls.
If I could have anything, I would like it to have a video camera with pan and tilt, two way sound, some light and sound effects (I have these laying around) and a confetti launcher. The last part I'm discussing with a connection from a professional confetti fx company (they sponsor this convention). For the video and audio I'm looking at using a FPV kind of system using a 2.4GHz or 5.8GHz signal transmission. I do have access to video glasses with audio but they don't have a... [Read More]
My robot runs Linux and it takes amount a minute to reboot. It's also probably not a good idea to instantly remove power from a Linux machine.
What I want to be able to do is to have my robot powered via a DC power brick source, but be able to detach from the that DC source whenever I put my robot on the floor. Since my battery is a Lipo it's not exactly trivial to build a charger, so I'm fine ( and feel better ) with having charging a separate commercial charger.
So kinda like what you would do with a laptop. You can have it plugged into the wall, but if you want you can unplug it and run off the battery.
Any ideas?
One idea I had was to just have my Lipo charger ( Cellpro 4S ) plugged into the battery balance connector while at my desk. The idea being that the robot would run off of battery power at all times, but the charger could charge the battery faster than the robot would drain it ( my main CPU only pulls 5 watts. )... [Read More]
I am currently running the Phidget 1061 usb controller. This board can be run from a windows mobile environment.
My question is this, when coming from a cell phone/pda to usb these are often out to a standard usb prong. Is there a converter of some sort to go from a standard male usb to a printer style male end to fit the phidgets?
Trossen Robotics Community
Hello,
So, I'm starting a new project at work - going to be doing some outdoor navigation research and development with Brainbot. The tracked chassis is not really suitable for that sort of thing, so we decided to mount the CPU/sensors on something a little more suitable for outdoor driving.
Hey everyone I just wanted to start a thread for my entry in MW 2010. I have been working on it off and on for about a year. The design has changed a lot from when I first started so it is really hard to say when I started on the current version. I took it to Toronto a few months ago for the walker comp and ended up placing third. 
Hello.
Hey Guys.. I just wanted to show this off.. I didn't build these.. I asked gdubb2 to build them for me (I'm a bit sort on time these days).. I just want to say, he did a kick a$$ job on these and they're completely awesome.
I am currently running the Phidget 1061 usb controller. This board can be run from a windows mobile environment.