Let's Make Robots!
Built few light saber before but this is my first multi color Lightsaber. LED string was finished years ago but never really finish this project and I think it's … Read more

Controlling lot of LEDs in parallel with Arduino & transistor

Hi all,

Got some questions about using trnasistor and resistor with lots of LED all together. I am not good in electronic planning but only drawing sketch out as image below.

Try to using as less resistor as possible so I only plan to use one and I know Arduino couldn't handle that many LEDs so transistor will be used as I know. However, I am not sure how to connect these points as identify in image below from A~G. Can anyone help me or sugeestion how this should be connected and what type of transistors, resistor should be used?

Another walking robot printed from 3D printer and using Arduino UNO with expansion board and BT. This gorilla type of walker should concider as quadraped but also … Read more
Nothing really special for this design. The leg is pertty much the same concept from last quadruped. Still trying to use all pins on Arduino without making own … Read more

Very clean designed DELTA 3D printer

How does it look? Not only the design but the printouts are pretty neat as well.

As I know it start from about USD $1000+

Quadruped, yes, four legs again. I think I am nore enjoy in building robots than programming bots. It just too much fun to see the idea in your brain comes out … Read more
Another BOB in LMR... This smalll guy become next idol for simple robotic and 3D printing practice. Thanks for model … Read more

MP3 shield for Arduino NANO

I got this MP3 shield recently and tried it for 2 days. Things are a little bit funny and strange. When I upload the sample program follow by few instructions, most of time they are not working. But if I keep clicking RESET button on NANO once in few seconds it works after 3~5 clicks.

Um... inspired by so many others are doing ironman's mask. I deside to make one my own, too. Instead of doing all that mass of resin,FRP, fiberglass etc, I find the … Read more

Arduino NANO v3 heat up with shields

I don't know it just me or everybody else too. Have you ever experience your Arduino NANO on any shield and plug USB to upload the program and NANO become very HOT? NANO works fine without shield connected.

The only shield works with no heat up issue is the undershield from Rocket brand studios. (Great job! Chris.)

and are all having heat up problem.