Let's Make Robots!

HC-SR04 problems

Hi all,

About a year ago I bought a HC-SR04 ultrasonic sensor, when I got it I tested it using some code I found on the internet and everything worked fine. Now I finally need to use it, I've tested it again with several different pieces of code and none of them seem to work, all I am getting is a seemingly random number that doesn't change no matter what I put in front of the sensor! However I can still hear clicking, so surely the trig pin is working fine and the issue is the echo pin? Any other ideas what the problem could be?

Thanks :)

Wow.

I want one.

Just an Idea that I don't want to forget :)

Ok so I've been playing around with my losi rc car and looking for a couple of hop up parts when I came across a video

Electronic suction pads/cups ?

Hi Everyone!

Does anyone know of any cheap suction pads that can be triggered electronically? I'm looking to build a robot that can climb smooth surfaces like glass and smooth walls, and suction pads are the only method that I can think of... If not does anyone know of alternative methods? It needs to be cheap, strong and quiet though!

Edit: What about using static electricity (like rubbing a balloon so it sticks to a wall) ? Any thoughts on that idea?  

Thanks :)

BMakins

Folding@home

Hi All,

I was wondering if any of you had ever heard of folding at home? What it is is a website where Stanford university are using the power of distributed computing to 'fold' proteins and ultimately help to solve diseases such as Alzheimer's, Huntingdon's and Parkinson's disease. 

http://folding.stanford.edu/

What is this?

Hi :)

I'm trying to make a simple IR transmitter and receiver circuit using the RX-B and the TX-2B chips. (http://www.elenota.pl/upload/TX-2B(RX-2B)AY.pdf on page 7) but I am unsure as to what the symbol with fosc=114Khz next to it means. It looks a bit like the symbol for a pot, and I'm assuming it has something to do with frequency? Any ideas?

Thanks :)

Linux

Hi,

I was wondering how many of you guys used linux? I use Ubuntu on my laptop, but am ashamed to admit that I have to use Windows on my desktop for things like, well just sketchup... 

So how many of you use linux and which distro do you use and why ? :)

A complete new update :) Since the old robotic arm was so terrible I decided to spend a pound or two on some acrylic and make robot arm version two, and here it is. … Read more