Let's Make Robots!

Romeo arduino compatable board boot loader

Hi every one 

 Well i am having some trouble with my Romeo. I havnt been able to program it via boot loader and i have figure it it my boot loader.

So A. how long does the boot loader take to load a program, less than 100 bytes. B. any suggestions on what i should do. eg. reload the boot loader, change a setting etc

 thanks for your help



I'm new to the idea of coding and would like to learn more about it, any tips or sites to go to to learn more about coding?

Pins for PICAXE 28X1

I bought the PICAXE 28X1 starter kit so that I can make the Start robot. I've ordered two sets of pins to solder on the two spots needed on the project board, but they were both the wrong size. I don't know of anywhere locally to buy these. Can anyone please direct me to a site with the correct sized pins for sale?

Max voltage for a motor


 I have some DC motors disassembled from a printer (HP Business Inkjet 1000) and need to know their working/maximum voltage. Searching the motor's model name in google revealed nothing.

The printer works on 32 volts (!), but I doubt all that juice arrives to the motors.
In its current condition, there's no chance to test the voltage while printer is running.

Besides a trial and error approach that might fry the motors - How can I find the correct voltage for each motor?

Need help with rotating electrical connection!

Hey guys,


I'm doing a project and would appreciate some help. I essentially have a DC motor controlling a blade from the center. On the blade is a sensor that I need to wire to the main circuit that is below the DC motor. The problem is when the blade rotates the wires will obviously tangle.

Servo Strength

Alright, so i've been out of the game for a while and most of my parts are being used. I now need to order several servos (12 in total) for a hexapod build I am planning. Each leg will have 2 DOF, with one standard servo (i'll come back to this) connected to turn the leg right and left, and a more powerful servo (coming back to this again) to move the leg up and down. I'm not exactly short on cash right now, but I really want this to be a relatively cheap build.

increase servo speed

Hi guys


i have built a well running heapod based on the picaxe 18x controller board


only thing i notice, compring with some  the bots here, is that the servos seem so slow


can i speed them somehow




IR puls modulation reciver

Now i have been looking after some info about when you are making a IR obstracle sensor. Is it realy that important with modulation if it is used indoors? And if it is, how do you get it to work, with modulation?

Most people that have made someting with modulation, dosent describe how you make the reciver modulate, or how you proces the data.

I can easily get the sender to modulate, but my question is, how do i get my reciver to modulate, and how do i proces the data.

K243 high power dc speed controller , trouble

well, i bought a couple of speed controllers a year or 2 ago ( same ones oddbot's Boozebot used )


and i had them working with the 10k trimpot, but when trying to control them with arduino it wont work 

mysetup: 9v battery to +,- on the screw terminals , arduino pin to sig, motors attached correctly , and secondary power supply on mtr+,gnd

any suggestions?


ultrasound interference

Another question. Am planning to use 3 ultrasound one directly above the other at about 3 cm distance from each other my question is there a possibilitty that their signals interfere with each other thus messing out the results?

controll phidget with picaxe

Can i use phidget sensors using a picaxe 28x1 and a picaxe poject board?

Wifi logic robot

So I was thinking, What if robots didn't do the "thinking" right there but sent it to a pc set to run the logic of the robot and then sent it back to the robot via wifi? I think it would be and faster and more powerfull then doing it on a tiny microcontroller.

Any ideas?

Robot supplies in Omaha, Nebraska USA?

I am a Beginner and I am trying to find places to get stuff in the omaha area so i can start building the beginners robot

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:

LMR 2 years old

At the time of writing this, LMR is about to celebrate it's 2 years birthday, and already people are bringing presents in the shape of birthday related pictures and stuff.

Please, if you are doing so, link to it from here (if it is a robot, blog entry etc) - (or directly write below if applicable)

Hoorayy :D

A long time ago, in a galaxy far, far away...

Quite a while ago, Fritsl suggested another LMR Skype weekend. Either that already happened, and a spammer brought the forum up a few months ago, or it lost interest.

Anyone feel like having a Skype weekend anytime soon? I have a microphone now, so I can finally participate!

LDR problem

Hey i plan to make a robot that has no brains at all. but the LDR's are not working! they were working in the previous appliance (outdoor light) but not now with a battery,motor and an LDR and it won't work! here is the schematic for my robot.


My Schematic                                                                        Can you please tell me what is wrong!

IR Sensor Killer

Hi all,


My team is building a competitive robot as part of our course work. As all of us are using the sharp IR sensor, I;m thinking of ways to confuse opponent's readings.


So far, here's the list I've come up with:

1) mirrors to deflect IR--pasting mirror surfaces around robot

2) IR jam--using IR leds to shoot out beams in all directions


I'm thinking of using uneven surfaces that will diffuse the IR beam (not tested yet).


Any suggestions to disrupt the sensors?

Dual Y-Bridge (was One and a Half H-Bridge)

I had an idea tonight that is either inspired... or stupid. Please help me determine which. ; j

I was thinking about using one of my new Picaxe-08 processors for a project. They only have 5 I/O ports, three of which can be either an input or an output. However, for my project, I wanted to be able to control two motors and two sensors. Since traditional dual H-Bridge designs would require four processor outputs to control two motors with forward and reverse, that would leave only one I/O port left. Boo hoo.

Maze robot coding

As you may know i have built a maze solving robot that does left hand on the wall currently. I have been trying to add the refining part of the code where it figures out the best path to the end without going down the dead ends (i hope you understand what i mean). Well to do that i need a string of chars and a pointer to tell where to store each char which is a turn like 'L' , 'R', 'B' or 'S'. Ok so every time i turn i need to add 1 to the pointer which i call "path_length" meaning the length of the path ie the number of turns the robot has taken.