Let's Make Robots!

How to connect the AERS-Sensor?

Hi guys! I am a new LMR-member and I will soon build my first robot. I have already ordered all parts. The problem is that "Sharp Analogue InfraRed Range Finding System (AERS-sensor)"  was delivered without cables. It is not described in the manual how I can do that or which cables I need. I am very greatful. if someone could describe to me how I can connect the cables to the sensor.

DIY laser cutter

Reading about all those lucky people that have access to a laser cutter, i was wondering: can we make one? I mean, build a custom (cheap) laser cutter?

I think it should be something like a plotter, so with a couple of fine-grained steppers and a frame structure (maybe some old scanner) that should be ok.

The problem is the cutting :P where can one find a good laser? i thought about CD-Writer but they have about 100 mW.. I don't know, maybe it's enought for a small dark acrylic sheet.. But i think the optical stuff won't fit :)

Help with 3D printers

Hello Guys,
I have to make a project for college and I am thinking to build a 3D printer in that project. I am absolutely new to this field and all I know about this field is how the printer works. I did some research and I found this printer. It will cost about Rs. 22,000 (or $350). As I said, I am absolutely new to this field so I need help.

GSM/GPRS module and arduino


I've just bought a gsm/gprs module named GTM900b and 

and arduino UNO and I was searching about I/O pins but

unfortunately I have a big problem with pin names ...

can anyone help me how to connect it to the arduino and get it to work ?

What did you do with your robot today?

What did YOU do with your robot today?

Making a robotic arm which will collect vegetables

Now i got a stable base that can run on dirt and can bring a payload of 2kg, remote controlled and a good brain which can get where are the veggies.

The robot base is controlled with arduino, and i want it to control a robotic arm to collect things.

What is the cheapest way to get an arm that can lift at most 1kg, grab firmly but not squeeze?

Hall effect activity on a nema 17 stepper?

I am trying to figure out a way to trigger a switching signal using a bipolar nema 17 stepper motor,  without altering the wiring.  An example would be to turn on/off an LED when change in speed or direction of the nema 17.  Without attaching anything into the wiring or the core/shaft. 

Stock Up Electronic Parts and Components

As the golden week of National Day is coming, both the suppliers and shipping agency are busy with preparing for the 7-day holiday now. To avoid the package delay and stockout status after the holiday, let's start to stock up with 18% discount now.

Check the deals here: http://www.icstation.com/newsletter/eMarketing/Stock_Up_0923.html

Questions on RF links and VirtualWire

Hi guys 

First of all I want to say this threat have nothing to do with robotics. Instead its about using some Arduinos to make a weather station. I've seen some of you are using RF links and VirtualWire in your projects so I hope you can help me anyway! :-)