Let's Make Robots!


Navigates arround controlled by other computer
Using a
Hi, This is my newest project. It is basically formed by two 28x1that are serial controlled by a processing application, one for the motors and other for the two … Read more

Wireless Control

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

XMOS based XC1 robot which tracks your hand

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

Building a Universal RF Remote - Questions

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.




Radio Controlled Servo?

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:

Parallel port control for a Mac

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?

Control DC motors with an ULN2803

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)?

DC motor control with Arduino

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: 

PID Speed Control

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.