Let's Make Robots!

Limit Switches with Arduino?

Dear: LMR

You should know my steampunk robot is going along fine with a minor setback. A few days ago I accidently shorted out an arduino uno for a simple mistake. I didn't know how to use a limit switch. Guys you should know I am using whisker type limit switches and arduino uno and I don't know what to do. I am trying to ask you is how do you wire the switch and how do you program the switch with my code. Thanks.

From: Noah

#include <Servo.h>

Servo myServoLeft;

Small Inexpensive Solar Cells and Motors - Beam Robotics


Can anyone recommend a supplier of inexpensive motors and solar cells for BEAM robots, preferably UK based.

Its for a school robotics club, the kids will need to buy the materials hence it needs to be inexpensive.

Here is an instructable that I have found, but something that moves a little more would be more exciting for the kids:



How i can links to components used in my robot?

info panel

How i can add links to what is used in my robots like the panel in the image?
Adding info in additional information seems not working.

We search talented persons to join our start-up !!


We create the first companion robot for the whole family, and we are looking for talents in robotics !! (internships, jobs, developers...)

Our robot works with a tablet and will be fully autonomous. We have already raised funds to develop the robot, so we are waiting for you.

If you want to join our team in France, contact me.



ICStation Offers You $15 Before 15th, Dec

2 days only, hurry up! :)

Enjoy the offer now: www.icstation.com

Low power radios

I would like to start a discussion revelent to low power (cost) radios and embedded electronics such as robots, environment sensing, and remote control of household or shop equipment. I am NOT an RF engineer.

To date I have experimented with:

  1. Raw, very cheap, tx or rx modules and transceivers
  2. NRF24L01 transceivers
  3. Hope RTM69 transceivers
  4. ESP8266 Wifi modules

I also have some other WIFI boards (Digilent PmodWiFi) that are still untouched.

Again, antenna and RF design are NOT part of my skill set!!!!

Question - Disable (power off) module if they are not in use.

I want to design a robot with differents modules:
GPS, Soud detection, ping sensor, optical distance sensors, and more
To prevent battery discharge, I wonder if I could disable modules if they are not used.

To do that I think to use an I2C port extender driving some Mosfets

My source current comes from a 7805, so max 1A to share. No need big mosfet

So my questions are:

ComMotion Shield in action!

Some time ago I built my Scamper robot to test / demonstrate DAGU's new Omni wheels with rubber rollers. Later I remade Scamper into a kit and combined the two Mini Drivers into a single PCB called ComMotion.

Dagu Rover 5 questions on motion accuracy

I apologize if these questions are answered, but I promise I've looked on this site and others. Perhaps I'm just dumb....