Wireless ISP programmer badge for AVR Freaks!
Project tutorial by Shahariar
Let's make some fog!
Tracks compass heading, altitude, temperature, pressure, humidity, time, travel distance and GPS location during a hike.
A simple project to show a clock on a wall with just one small laser and a rotating mirror.
A dress with my painting of flowers on the fabric; fireflies in the flowers blink according to wearer's heart-rate.
Project tutorial by Kitty Yeung
It came with only an on/off switch. Adding an UNO to this LED chalkboard really gets your attention - it is quite a flashy pig.
Project in progress by Team ArduBacon
@Westpol, Yes, you are right - that's why my 3x4700 uF (electrolyte) @ 20 volts can make one weld per charge because of high current for a fraction of second.
Only one weld every time and energy output only 3 Joules @ 20V. But it welds. Yap, super cap will allow you multiple welds, more power but electrolyte charges with in seconds and cheap. I am just sharing my experience. The 1F,5.5V supercap I tried was probably a dud, only gave few 100mA short circuit current.
Normal electrolyte capacitor might work too for the job.
I was goofing around with 3 paralleled 4700uF, 35V capacitors. Those puppies were charged around 20 volts, shorted 'em, wire got spot welded between +/- legs and the spark was like fireworks !
Capacitor energy is 1/2*C*V^2 , so increasing voltage gives more energy than farad.
I don't know about the supercaps you have, but in my experience some supercaps have high ESR than electrolyte ones. High ESR of few ohms can hamper spot welding.
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