Let's Make Robots!

Should we kick out vendors? Please vote!

Question: Are we seeing too many vendors on the pages, making challenges and pretending to be friends and stuff?

Write ***Y in comments below to vote Yes to the above question

Write ***N in comments below to vote No to the above question

We ARE planning to see lots of vendors products in a new components section that we are working on. But I am sure that will just be nice for all of us; Cool products nice to browse, and a nice place to showcase what you sell (unlike now where it is a not so nice list)

Regarding Robots which uses GPS tracking...


I am new to this forum, and I want to submit a project to school on Robots.

Aim: To feed the destination address like NMEA code to the controller and it uses GPS receiver to know its present position and compare with the destination address and move to the destination address specified by using stepper motors..

 Can u pls guide onthese..

How to decide about stepper motors and controllers I thought of using ARM7 whether its OK or not..???

PLease guide me...

Putting voltage through a photo cell and to motors?

While I wait to get some real parts, I've been tinkering around a bit. I made sure that one of my photocells could endure 9 volts without exploding (out of voltage regulators), and connected it to a buzzer and battery to see what would happen. It worked pretty well, and I found that the more light the photocell took in the more power the buzzer got (and thus the louder it got). However, when I replaced the buzzer with a small motor I got nothing. I tried a few other motors and still wound up with zip. How to I make the motor spin faster as more light is taken into the photocell?

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?


Servo controller using timeframes

I have four servos with the following specs:


How to click a relay with a low signal?

I need to click a relay when a signal goes low. I have a couple relays on Walter, but they all click when signal goes high. These are pretty straight-forward, just a simple 5v relay, and a 2n222 NPN transistor to click it when a data-level signal goes high. --No Problem

picaxe 12 volt car battery

Hello there!


I'm gettting pretty excited with picaxe and want to start building circuits to control gadgets in my car. So, picaxe circuits all seem to run with 4x1.5 volts batteries ( 6 volts). I want to run them in my car: 12 volts. what is the best solution, and the simplest? (i tought about using those car cellphone chargers that convert 1v to 5.5v, but there is gotta be a better way, right?




Line follow sensor spacing ??

I am a bit embarassed to be asking this but... With everything I have done with Walter, I have never played with a line-follow set up. Now, the electronics I have down solid but I am a little fuzzy on the theory of opperation. I intend to use 4 sensors. Where do they go?