Let's Make Robots! | RobotShop


Drop and Obstacle Avoidance - Which Sensors to Use

Hello Everyone! 

I'm new to the forum and had a few questions regarding sensors. I'm building a project bot and I'm looking for some info regarding two topics for some things I need the bot to do.

1) Not crash into anything - obstacle avoidance

2) Not fall off of anything - drop sensors

A couple dilemmas are - Direct daylight and dark surfaces.


How to build your first robot?

Dear: LMR

Just to let you know guys it wasn't that long ago I asked my Dad if we could start a robot club at school. My dad brought it up to my princible and he did not have a problem with it. This robot club is probably going to teach people in highschool to build there first robot. I have no idea what robot I am going to teach highschoolers to build.

A better way of debugging sensors with a realtime plotter

Debugging sensors on a microprocessor can be a hassle and the most used approach is to output the sensor values to a serial monitor. I made a realtime plotting tool which is a better and more visual way of doing the same thing. I created this software to debug an Arduino Due on my self-balancing robot.

I need help

I am stuck and need help. I want to design and build something for my brother to give him for his birthday. The basic premise is this: I want to make a device that will sound some sort of alarm when his dog comes in our goes out of his doggy door. I am at a loss for what type of sensor to use. Proximity? RFID? is there any cheap way to go that will allow me to attach something to the dog collar and something to the door opening that will make a sound when the dog passes through? Ive racked my brain and would appreciate any help.


Tells the direction of motion
The device uses 2 ldrs. It is programmed to check if any of them is low(I mean not receiving light). If so, then it checks if now the other one is low. Based on … Read more

Has anyone used Longer-distance rangefinders (ie golf Laser Rangefinders)?

Was wondering if anybody had any experience or had seen anything on here about people using longer range laser rangefinders as sensors for their robots. 

Convert home to an immobile robot. Collecting sensors reading and in the future will take actions
After having read so many interesting posts on the LMR I wanted to make also my contribution. The present project is not a mobile robot but rather an immobile one, … Read more

Necessary Requirements for Connecting Servo motors, Gear Motors & Sensors to an Arduino Mega 2560 REV3 Board

we are pretty new to robotics and all the knowledge in it is pretty new. Currently we are in the process of making a mobile robotic manipulator for our engineering graduation project.

Though we have completed the mechnial kinematic parts, presently we are in the process of figuring out how to fix various electronic components. From basic calculation we have calculated the necessary torque and force required at various joints. But now that many of the components are here we are pretty confused as to what goes where.

the bot basically have 

A Robot Operating System

We at RobotBASIC are currently working on a RobotBASIC Robot Operating System (RROS).

The full RROS will manage almost any type of sensor allowing hobbyists
without an electronics background to build and program sophisticated
robots.  The RROS will probably be distributed Open-Source to allow
expansion and customization.  We will even allow users to share their
modifications through our web page.  The LIGHT version is requiring
sensitive coding that will not be appropriate for modification, so it will

For multiple type sensor robots which is better

For robots that have multiple types of sensors, like adding touch sensors, light sensors, temperature sensors, and a mix, which is easier, Picaxe or Ardunio? Or is there a better microcontroller or setup? I know Lego's NXT has these abilties, but I wanted to know what other setups are out there that work really well or are the easiest to work with or put together.

attach components to supports like pvc, acrylic, wood, cardboard, polymorph
During the development of Farrusco, we tried a lot of different ways to attach components to PVC supports, from hot-glue, to screws and double side-tape. Because … Read more


Ya so a few topics I have a little gliches and I would want to know bout them. Firstly, instead of a picaxe or arduino board can i use a simple breadboard. IF yes, then please suggest a simple microprocessor, how to program it, AND WHERE TO PLUG IN THE USB OR RS CABLE TO??? Cause my conception is that the female usb jack is built on the picaxe board. Secondly, Suggest any other sensor than the SHARP. Any sensor even an audio one will do. Thirdly, I would appreciate if someone actually explained all the special components of a picaxe board. Thanks in Advance. :)

Cluster Bots

Hi this is just a forum for any beginners who want to build Cluster Bots

Robot Slave Project is this feasible?

We are planning to make a Slave robot wherein a user will carry a transmitter and the robot with an embedded receiver will follow him around carrying his baggage(15-20kg).

An IR transmitter in the user side will broadcast and a receiver embedded in the robot will receive the broadcast in order to determine the location of the user.

A fixed distance of 1-1.5m should be maintained between the user and the machine. In order to prevent the machine from bumping the user.

Tells you what pipes to hit to play certain songs
Hi, this year I attended the 2010 National Scout Jamboree. My troop's gateway theme was The Blue Man Group, so we built PVC pipe instuments for people to play when … Read more

Good IR Bumpers?

Can anyone recommend any good IR transitters/ir detectors that can be ultilize for object detection. I tried using a phototransistor with an IR transmitter, but it only works when the IR transmitter and phototransistor are pointing directly at each other.

pir sensor


 I have this sensor from a security alarm... i have open it and get the little pir sensor (2030B).

 I have readed the pdf about it and i know what are the connectors in it

 Question... the pir sensor will work stand alone? i have connected the sensor to arduino 2009 and use some code that shows the sensor response...but i think that is not working because even disconnectiong the sensor the values are the same.

What is needed to the sensor to work? can i make it with my breadboard?






Teaches you how to connect a Wii Nunchuck to Arduino
You may be asking to yourself, “Why would I want to connect my Wii Nunchuck to my Arduino board?” Good question. By attaching a Wii Nunchuck to your Arduino … Read more
Our shield that we designed with Eagle arrived today from batchPCB.com.   We have to test it out yet to make sure it works properly. I was just excited to show … Read more

Alright, I think I've figured out the "skate-o-meter"

so from discussion on this node, I was able to come up with ideas, thanks guys!


I don't have an image to describe what I want to do with the sensor on my skates because A: I suck at drawing, and B: I suck at drawing on my computer.

At first I wasn't too concerned about having an "exact" distance traveled, just some number that if I saw it go higher with each skate session, that would make me happy, but of course you guys got my brain juice goin'.