Let's Make Robots!


Is this something to bookmark? Anyone have experience with bildr yet? Does it apply to LMR as well?

[edit: LMR-II does support vimeo embedding!]

Stall Detection

Ok, here's my problem for you guys.  How do you use a MCU(Arduino, PIC, Stamp, etc) to detect if the bot has a motor stalled on it. I know it can be done, because I've read about bots that are bumperless and detect which motor(s) are stalled for collision detection.  Yes, I know you measure the amps that the motor is pulling, but how do you use the microcontroller to do it?


How to connect stuff?

I recently had the great idea of building a robot.


So I went and bought this:


and a PIC 18F4550 IC to go on it, as well as some wires and a couple geared motors and a servo. So... How do I connect all the stuff together so that it works?


I have never done anything with electronics before in my life.

PIC ports

I'm having problems with 18f252 ports. I seem to be unable to control it as an input or an out but. Thus I am also unable to use the BTFSC or BTFSS controls. Is there a difference between the 16f and 18f series with regards to inputs and outputs?


Sorry for the lack of info. I was in abit of a rush, I'm rushing now too :p

so the code i used is fairly simple :

The main part to control the 18f252 is ---->   MOVLW B'00000000'


Modifying source code (IR instead of ping)

So I have finally found a code that seems like it is going to work from this node:



However, I want to use a sharp IR sensor instead of the ping, as the sharp is cheaper and im on a strict budget for this project. I have no idea how to change the code, as I am just beginning to learn the language. Can anyone help me out? Here is the source code from that node:


Marry RC-Car and autonomous control

Has anyone been combining radio control car technology and autonomous controls?  I found the contribution by fritsl http://letsmakerobots.com/node/928.  It is over a year old now.  What has been happening since then?

Location, location, location!

Hello everyone!

RC power for my picaxe

I'm using RC ESC's to drive the motors in my current robot project. These speed controllers has a built in power regulator (called a BEC) that is meant to power your RC receiver. I've measured and the voltage produced is a steady 5.03 Volts.

Can any of you think of a reason why I couldn't or shouldn't use this as power source for my Picaxe 28x1 ? 


Can't seem to insert hyperlinks with Opera browser on my old iMac, so here are a link if you wanna read more about RC ESCs or BECs


Fingertech Robotics Question

Do you remember when you sent me that hard copy pdf file of the high torque servo? With all the stuff I needed to Cad it? I need a hard copy of the servo horns it comes with. Please email it to Benbo231@gmail.com as you did before. Hurry, I am at a standstill until I get it, and my deadline is rapidly approaching! I have until the end of next week to CAD about 40 parts, usingabout 3 square feet of aluminum. Please hurry.

YDM for sale Make me an offer!

Hello Everyone,

I have a version of the YDM for sale.  It was first built by an engineer in Toronto and then shipped to Fritz to Denmark for completion. I originally wanted this YDM for my school robotic shows but it is too small for the student audience to see.

It works perfectly.  Although it does have one of its front drumming sticks bent due to shipping.

I will probably put on eBay if I don't receive any offers here.

Email me with any questions.