hi everyone,
suffering from battery power supply at pin Vin.
Battery supply=11.4v(3s),2200mah,25c[rechargable],lipo.....given at pin Vin in arduino uno.But it getting hot within 5mins; after that power LED starts blinking,and as well as atmega16U2(smd) and atmega 328 is getting hot.After that when we connect it to pc usb port is not detecting in pc.
what type of problem it is????please help us...
Hi man
Arduino's ICs shouldn't get hot at all. Are you sure that your 11,4V didn't get in touch with any other signal? Lets say, the 5V one?
If you fed any other pin with 11,4V tham is probably that you broke the board.
Last thing, was the GND properly attached?
Best of luck
Thanks for the reply...
yes...i've checked everything before make the connection....actually i want to make arduino based quadcopter, so i gave the power from lipo battery (3S,2200mAh,25C) & there is no extra power supply near arduino board.
after studied the specification in arduino.cc i decided to give the power from battery...but before that it was working properly....but after that i faced the above mentioned problem....i don't understand why??!!
Another important thing i noticed that the power comming from usb to board is 4V (actually 3.97V) which is simply odd. But the connector is perfectly OK , because i've checked it in other board & its giving 5v.
Now, how will i know the board is ok or not(technically)?? what is the solution??? please help me...quick reply....
A 3S Lipo is 11.3V when it is DISCHARGED and 12.5 V when it is charged. Trust me. I used them for 7 years when I was flying RC model aircraft.
As already stated, nothing on an arduino should get hot. If your Lipo is getting hot there is something wrong because a 25C 3S lipo can discharge at (25*2.2A=55A ) which would drain the battery in 2.4 minutes but still be within spec for that battery.
hi raschemmel,
thanks for the reply....actually battery power is connected to 4 ESCs & arduino board in parallel ,so current draw theoriticaly should be ((25*2.2A)/5)=11A....... but now what should i do?? shall i change the board or there are another way??...please suggest...
shall i change the board
Yes if you want to blow up another one.
but now what should i do
Draw a schematic of what wiring you have done. You were holding out on us over the
actually battery power is connected to 4 ESCs & arduino board in parallel
What else don't we know?
Hi, for the work you have done, you must have a circuit diagram, if you don't then STOP and draw one.
Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png or pdf?
Also a picture of your project so we can see your layout of components and connections.
Do not use Frirzing, please, we need a proper schematic.
Tom.......... 
4 ESCs will be putting loads of power spikes all over that supply rail, at the very least you
will need to have a separate route for power to the Arduino from that to the ESCs from
as close to the LiPo as you can achieve. Extra supply decoupling at the Vin / barrel jack
may also be needed in such a high-noise environment. One strategy is to use a DC-DC
converter between LiPo and the Arduino, to help absorb/filter the transients and
provide more stable power.
As always you will have less problems if you power the Arduino separately from the motors.