Let's Make Robots!

Line Follower Robot using a PIC18F252 microcontroller

I am using C Programming to program a PIC18F252 microcontroller chip that allows a robot to follow a line then change directions in different direction on each end and also senses blockage and goes back. This is my code wich at the moment is giving me problems allowing the robot to change directions in different directions and sense blockage...can anyone see where i am going wrong and help out?????????


#include <p18F252.h>

simple robot using AVR

Being Frank I'am new here! can anyone help me to make a simple robot. having two Dc motors a microcontroller of Atmels AVR(any series) controlled by using timers by programming for e.g:-I want to make robot which  should go straight for certain seconds then turn left then right! 

  I don't no which one  I should use in AVR series will it help by using ATtiny25 or 45 or you may tell me another one.

  PZ help me!!! 

Norway LMR Beer???

Hi, everybody!

I know everybody is busy with his (her) own business, but I feel if I do not post it I will feel bad :) I'm i Stavanger, Norway at the moment for training. Enyone wants to meet for a beer in sake of robotics? :) 

Computer Controlled RC Car with Wireless Camera


I wanna a project for my studies...

here is what i would like to make..

1. A RC Car that is controlled via computer and not by the its remote. i wanna create a application that controls the car and also displays real time video.

2. I wanna use zigbee (XBEE pro) for transmitting and receving commands and controls.

3. Wanna use mobile phone (wifi) camera for video transmission.


now i wanna know How can make this ???

1. which microcontroller should i use ????

2. which software should i use to make the compuetr app.

Looking for ideas for RAD 2.0

Yesterday I picked up a RAD 2.0 robot toy from craigslist for $5. What a steal! Everything works fine, even the old battery seems OK.

This guy stands about 19 inches high and is pretty darn cool. Here's a few of his stock features:

5V and 3V together


I'm building a board that needs both 3v and 5v as it has some components working on 3v and others on 5v. Now what is the best to do in this case? I am not sure, i've analyzed some of the options but i really do not know the advantages/disadvantages of each:

- have a 5V regulator and a 3V regulator with the input connected to the 5v reg's output (could be done, the 3v reg is low dropout)

- have a 5V reg and some diodes to output 3V (or a voltage divider with resistors)

- have a 5v reg and a 3v reg with both inputs connected to the v+ on the battery 

Edge Detection

I've noticed a lot of robots with edge detection, to prevent them falling off edges (obviously).

I'm curious as to the type of sensor used for this. I'm assuming it's IR, but are people using an off the peg sensor, or making their own?


The Bromz.

Best Arduino (compatible) board?

I want to make the next generation of the "Start Here"-instructions be based on Arduino instead of Picaxe.

Some will say that it was about freakin time, but so far the advantage of the Picaxe has been that I could chose a single board that "did it all": Hook up Motors, Servos, sensors and everything.

This, and the fact that the Picaxe Basic Language needs very little introduction, made it the choise - even though the Arduino series has been a lot more popular recent years.

Microcontroller UPS

I have the following problem.
I’m rebuilding my SEA RENDERING http://letsmakerobots.com/node/21098 project from two Arduinos to one FEZ Panda running .NET
In my original setup I had one switch for the main power and one for stopping the logging. The reason for this is that if one shuts down power when the system is writing to the SD card, you might end up with a corrupt log file or in the worst case a completely ruined SD card. In an attempt to remedy this I made the following circuit that worked great on the breadboard.

Has anyone done a "Heli" flying bot?

Nothing fancy, but im wondering if anyone has done much in flying bots.

My Idea is just to get one to up in the air initially (i'd have a string/killswitch of some sort to turn it off or to prevent it from going to high.)


Im curious what weights/power would be needed....what kinds of motors etc.... And it seems like if you had a servo attached to the propeller that "tilted" it backwards/forwards/left/right that you could maybe get some control in direction?

Finally finishing the "start here" bot.

I just got the part I need for the "start here" bot, which is the new GP2Y0A02YK0F. My first problem is, I can't remove the old GP2D12 from the cable that connects it to the PICAXE board. If I am also correct, The setup should be the same as the old GP2D12 right? Like where the wires are supposed to go?


Rover 5 - 4 Channel Motor Controller: PWM Frequency

I just got hold of OddBot's Rover 5 platform and the 4-Channel Motor Controller.  I'm still fairly new to all this and I'm not sure what PWM frequency to use for the controller.  The datasheet that I have doesn't specify so I'd appreciate any advice you can give me.

Many thanks.

Robot Vacuum Cleaner

After doing some searching the last few days I've found that either there is very little information on people who have created their own autonomous vacuum cleaners, or iRobot has done an amazing job at taking up a vast majority of searches on the subject every place I've found. Given the high cost of the Roomba, and the relative cheap-ness of robot parts, this is surprising to me. I've seen posts for the crumbot, and the post for the bot using that $7 mushroom vac from dealxtreme. So I'm wondering, is there any more information available? 

Control Servos With PC.

Hello. I understand that this is a very broad question, and I have been looking into options but am confused as people tend to start getting quite technical with their answers rather quickly.

I am very very new to robotics, and would like to learn how to control servo motors via a PC, as in how to rotate the motor to different degrees around its axis. Ideally I am after a way that can control many servos at once.

what do you think of this H-bridge?

so i had a week off from school and wanted to experiment with an tlp434/rlp434, i scrapped together a couple of tiny motors off an old cd player and needed a tiny way to run them off a logic signal. I present my tiny solution for your judgement: The Bottlecap H-bridge

bottlecap h-bridge