Member Since: July 29, 2009

Country: Netherlands



i love everything that has to do with electricity

Spoken Languages

Dutch,english and a little bit german

Programming Languages

Arduino(c++),Basic,HTML,javascript and SPIN






  • Many sonar sensors use 40khz as it’s working frequency and yeah that is in within hearing range of animals, But the pulses created by sonar sensors are very short and not at all powerfull. It is not harmfull and none of my cats have ever responded even remotely to any of my sonar sensors, not even a twitch in the ear.

  • Sonar sensors have gotten pretty cheap over the past decade. I remember each costing atleast 15$ as a minimum and the Ping))) costing 30$ back then aswell. Now you can get sensors for a few bucks a piece. So i would guess that the Ping is just a older more expensive sensor.

    To be fair tough looking at the back of the ping it is a little more complicated in design and probably a little bit more complicated. The SR04 is pretty simplistic. can’t say for certain tough.

  • So the Power supply is one of those universal ones that is compatible with both 120 and 240v?? it aint specified and not every power-supply is compatible with both US and EU voltages

  • idk if you still need to know, but in case others want to know:

    Yes mbed LPC can be used instead of a arduino. This RGB matrix is mostly pretty rudimentary (it is basicly a very large Dot-Matrix display). In fact it is probably more desire to use something as a mbed as that has plenty of memory and processing power to control the screen quickly and do whatever else you want it to do.

    This answer applies to any ARM or FPGA device really. mbed, Teensy3.x, Arduino Due.

  • A Probably good idea is to write down it’s information if planning to plug/unplug more then a few times. That text is likely not going to last that long if frequent plugging is involved.

  • hmm. i thought these were replaced by their 16 and 32kbyte siblings on most/all sparkfun boards years ago. Have they gone by in storage unnoticed for so long?

  • Well its a Nintendo DS touch screen. Their displays are 3" diagonal, 2.4"*1.8" dimensions. 4:3 aspect ratio. So a 4:3 3" screen should be what you are looking for.

    Hope this helps!

  • Well this is not a Display board. its only the touch-screen interface. you would need to put a seperate lcd underneath the screen for a full on touch display.

    As for the screen here working with arduino it’s pretty easy. The Bildr tutorial linked in the description shows you exactly how to use it.

  • Very unlikely. RasPi consumes up to 700ma@5v (Model B). You will probably want the 2000mah version if you want the raspberry to work for atleast 3 hours at maximum consumption. You may also want to look up on how others power the Raspberry pi of batteries. Some parts need 5v and others 3.3v so you may need to do some boosting and regulating to get everything working properly.

  • If the discharge limitation of 2C is incorrect. Then what is the actual limitation? its kinda important considering there is no built-in protection. Also what are the real dimensions?