control

I am going to try to make a small cheep telepresence bot using a board of education and an Ipod touch (for the actual chatting) and I was wondering how I should control it. I am trying not to use a another microprocessor.    

I think that LMR should have its own series of circuit boards, with the designs open source for all LMR'ians to use. Heres a couple ideas for PCB's:

Hi there, I have recently bought a RP5 chassis from pololu, this chassis is holding 2 brushed DC motors (6V) and I have some questions: first of all; how can I control it? I mean, do i need to control it by PWM or is just 5v or 0v?

second, I built a little pcb with a L293D to protect the controller (Arduino) from reverse current, is this ok? 

Is there a way to control servo position and speed at the same time? ex: you want to build a biped but you don't want the movements to be jerky.

thanks

I`ve been wanting to build a mid size remote controlled camera head that has 3 axis and can be computer controlled and repeat its motion. I have a few RC helicopters that we build very basic 2 axis heads on, that work with servos and have a gyro to keep level.

The idea would be for it to rotate at about 300 degrees per second and to be able to feater in and out the motin for it to be smooth. I would also like to try to put some gyros on it, to stabilize it if it is free swinging on the back of a car or helicopter.

Hello,

 

I what to finally make my firs robot, but I have one problem:

I found for my base nice RC car. Its perfect and also have  power supply (6V 620mAh Ni-Cd ) with charger. Also servo in front. So its perfect, but it have very powerfull DC motor... Is can use more then 4 Amps of current (if wheels are blocked). If car is lifted and  wheels are spinning free it uses about 0,4A. Then starts a moment use about 1 A. All my tests were with my 6V Ni-Cd battery.

 

ok. Im trying to build a minature arm to lift and move small things. Ive got it built with 4 servos connected to a picaxe 28X project board but i really have no idea as to how i am going to control it. Ive bought a couple of playstation analog sticks which i want to use to control the robot but i do not know how to connect or encode them.

So can anyone make a suggestion as to how i would go about this. thanks

I found a remote control i want to use it to control my slightly altered start here robot. Do i have to change the code on the remote.If so can you post it??? Also what extra code do i have to put in my picaxe

thanks muchly...

sorry about the quality

Just happened to find this on youtube. Is not by me, but is a cute video none the less so I thought I would share it:

Cute little XMOS XC1 robot

More Recent UPDATE: the competed remote can be found here. Thanks to fritsl and rik for their respective helpfulness.

UPDATE: Attached (and blurrily pictured below) is my schematic that i think will work for this remote. Yes I drew it in paint, Yes it took too long:

*The "To Breadboard" leads are included so that the remote may also serve as a portable power supply.

 

 

 

I am completely new to robot building, and electronics in general.  I am currently working on a homemade airsoft claymore.  It is designed to be toggled via a wireless remote control. The issue is that I don't know much about wiring remote controlled systems. I've built a few remote controlled cars, but they were from kits, so I really didn't understand the electronic aspects: I just assembled them by following the instructions. Here is my problem with my current project:

Anyone have experience with controlling a parallel (8 or more lines) output on a Mac (OS X)? I want to control my CNC machine with a parallel interface but Macs don't have parallel ports anymore. I need to find a suitable replacement, but a serial port/MCU would drastically complicate things. Please help! What hardware should I get?

I live in argentina and getting thing shipped here is a mess, so I try to use whatever is available here (which is rather limited) whenever I can.

So I was wondering since I haven't found any of the typical H-bridges ...is it possible to control DC motors (speed + direction) with a ULN2803? These I can buy here. 

If so then how would that setup be? Do I need any additional components? If so then which (transistors, resistors, diodes etc)?

Ok, so i had this running just a few days ago, but then when i tried to assamble it didnt work out for me. Now I cant even get this simple DC motor running from the arduino, or to be more precise; the motor will run at a very low speed. Connecting it directly to my two 1.5 batteries it will run at full speed, but when trying to control it from the Arduino it wont work for me.

 Here is my setup:

and the code is dead simple: 

Hello All,

I am new to the site and would like some help with DC motor speed loop control.

A basic proportional  control loop actually works.  The problem I am having is that I need my main power supply to vairy, yet keep the motor speed constant.  The project deals with a helicopter where I need to keep constant speed independent of the battery voltage slowy dropping off.

I have designed and used PID loops for DC gear motor position control, but I am having trouble using similar equations in this application that required speed control and not position control.