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1  Community / Bar Sport / Re: Your latest purchase on: May 17, 2014, 02:54:51 am
Bought 20 LM2940 5V TO220 regulators on Aliexpress and got burned... Tried out 2 and they are crap. If I try to draw more then 200mA from them the output voltage drops to 2-3V. The input voltage doesn't seem to matter, tried feeding them 6 to 12V. With currents less then 200mA they seem be fine.
2  Topics / Robotics / Re: Basic Robot Platform on: May 07, 2014, 02:44:45 pm
You will need a motor controller to control the motors.
3  Using Arduino / General Electronics / Re: True Fact: TI still manufactures the 74LS47 on: April 26, 2014, 03:28:14 pm
I have 2 HD74LS74AP IC's. The only other marking they have is 1G16, which I assume is the date code? Not sure but I think I bought them from Tayda electronics.
4  Using Arduino / General Electronics / Re: True Fact: TI still manufactures the 74LS47 on: April 26, 2014, 04:28:26 am
May I ask what you are using them for? When I started out with Arduino I bought a whole bunch of 74xxxx IC's. But haven't done much with them.
5  Using Arduino / LEDs and Multiplexing / Re: Colorduino Problem on: April 16, 2014, 08:43:04 am
Why have you connected the Colorduino to another Arduino? The colorduino has its own ATmega micro controller. You just have to upload the sketch to the colorduino not to the other Arduino...
You can connect several colorduinos together over I2C. But you don't need another Arduino for that.
6  Using Arduino / General Electronics / Re: Shift registers - only good for LEDs? on: April 13, 2014, 11:26:42 am
I've built a small robotic vehicle that uses 4 small stepper motors. To control the 4 stepper drivers (ULN2003) I used 2 74HC595 shift registers. http://www.bajdi.com/arduino-28byj-48-stepperbot/
So yes you can use shift registers to do other things then blinking leds smiley
7  Community / Exhibition / Gallery / Re: Scrolling LED matrix display - Parola for Arduino on: April 12, 2014, 04:17:15 am
Built 8 modules from ICstation yesterday, and tried out an example sketche of the library. Works great. Thanks for the fantastic library smiley

https://www.youtube.com/watch?v=i_8tvPwT6OE
8  Topics / Robotics / Re: uArmⅠ:An open source robot arm on: April 11, 2014, 01:30:22 am
You can use Draftsight to edit dwg/dxf files, it's free. So no $$$ needed smiley
9  Topics / Robotics / Re: how to let my robot follow me ?? on: February 22, 2014, 04:59:24 am
I've done this with an IR led and a WiiCamera: http://www.bajdi.com/follow-the-leader-robot-style/
10  Using Arduino / Programming Questions / Re: Is the Arduino compiler very bad at optimizing code ? on: February 18, 2014, 08:51:02 am
The UTFT and Utouch libraries take up quite a bit of memory. I assume you have edited the memorysaver.h file as explained in the documentation of the UTFT library?
I was using a 5" inch touchscreen TFT (800x480px) with an Arduino Mega and switched to a Due for the extra speed/memory.
11  Community / Bar Sport / Re: Famous Italian "exports" on: February 13, 2014, 04:47:31 am
Strange that nobody has mentioned designer clothes? Gucci, Versace, Armani...
Italy for me is "design", when the Italians make something it has to look, feel good in the first place. I like that. That's why I've owned 5 Alfa Romeo's, currently drive a Giuletta.
12  Topics / Robotics / Re: arduino robot pinout on: February 13, 2014, 04:29:00 am
Pinout can be found on the product page: http://arduino.cc/en/Main/Robot
13  Using Arduino / Microcontrollers / Re: RTC module DIP IC which supports I2C,Battery backup and alarm on: February 09, 2014, 10:42:59 am
Have you looked at the DS3231? Probably only available in SMD but it's not that hard to solder. Or buy a module on Ebay, I have a couple and they work great.
14  Using Arduino / General Electronics / Re: ESC 4/3S on: January 30, 2014, 06:22:59 am
No the voltage will not be "stepped up". The ESC will probably work at a lower voltage but will not be able to give the rated current. So it's best to use a 4S battery if you want to use it at it's rated current.
15  Topics / Robotics / Re: Cheap Tank Tread Platform on: January 29, 2014, 03:03:31 pm
Dagu Rover 5? I have 2 of them:
My first one, have now fitted mecanum wheels: http://www.bajdi.com/?attachment_id=625
And my latest project, has an ATmega2560 and Raspberry Pi with camera:
http://www.bajdi.com/dagu-service-droid-now-with-raspberry-pi/dagu-service-droid-front-2/

It's a cheap platform, there are different versions with 2 or 4 motors and with or without encoders.
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