My Iteaduino 2.2... suddenly not working with DC input power.
But working in USB power.
What should I do?
Hi
Does the power LED come on with USB but not with the 2.1mm power connected? If so, to troubleshoot have you any way of confirming your external power source is supplying in the range 7-12V?
Geoff
- Check power supply voltage.
- Check voltage after protection diode.
- Check voltage after 5v regulator.
One of these will fail.
Does the power LED come on with USB but not with the 2.1mm power connected? If so, to troubleshoot have you any way of confirming your external power source is supplying in the range 7-12V?
Hi.. The power LED come on with usb but now with the 2.1mm power connected.
Power supply that I already tested are.. 9.0v, 17v, and 12v.. But it is now working.
- Check power supply voltage.
- Check voltage after protection diode.
- Check voltage after 5v regulator.
One of these will fail.
how can I check it..
Do I have to use a tester.?
Sorry I'm a bit noob..
khizon18:
- Check power supply voltage.
- Check voltage after protection diode.
- Check voltage after 5v regulator.
One of these will fail.
how can I check it..
Do I have to use a tester.?Sorry I'm a bit noob..
You can say that again 
How do you expect to test it without a tester? Of course you need a tester. You can't test it just by staring blankly at it.
You require a multimeter - ideally digital. It's one of the first bits of equipment you should get, even before you get your first Arduino. It's the single most essential piece of kit that anyone doing anything even remotely linked to electronics HAS to have.
Go and buy yourself one - even a cheap one for now will do.
I find out the problem after I buy the tester..
It is a s4 diode.. but what kind of s4 diode it is?
It's a 1A schottky diode - looks like an SOD123 package.
I use them all the time.