arduinobatteriespowerpower supplyvoltage
I would like to power my Arduino Yun board with the following battery:
Arduino Yun has a VIN pin that represents the input voltage to the Arduino board. The official documentation says:
Unlike other Arduino boards, if you are going to provide power
to the board through this pin (VIN), you must provide a regulated 5V.
What I have to make (exactly)?
Note: I have some diode, resistor and other basic component…
Powering motors from the same supply as the Arduino is likely to cause problems with the noise from the motors affecting the AVR. Using separate power supplies is advisable. If you really want to power the Arduino from 15V, put a suitable heatsink on the regulator, or use another regulator (a switcher, perhaps) to lower the voltage.
When you are realy in such a hurry, you could attach the wires of the battery with some tape to the spots I marked in the picture. Maybe the bottom is easier to get the wires stick to.
When I remember right (1) is +9V and (2) is GND. The integrated diode should prevent damage, if you connect it the wrong way.
After taking a look at the schematic I would mean, that connecting the battery to VIN is save. Just be carefully not to change polarity, because you skip the protection diode. This forum thread approves my thought.
In the comments you asked, whether you could use an additional external diode to increase safety. In my opionion this is not neccessary. It is just getting more complex. Get two colored wires (black, red) and connect them to the battery, so you can immediately see whats GND. When you connect the wires, just pay attention.
Best Answer
Your best option is to get a separate 5V regulator (Linear or SMPS will work) to power the board from your battery. Digikey, Mouser or many other component distributors supply power regulators. A linear regulator would probably be the easiest to use. Generally there's an input pin, an output pin and a ground. You put the positive battery terminal on the input, the output pin to Vin and ground to ground on the Yun board and to the negative terminal of the battery. The regulator should be a 5V regulator obviously.
If this is somehow too costly, or you're under strict time constraints, you could probably get away with putting 2 high current diodes in series with the battery to Vin. This would drop approximately 1.4 volts from your battery voltage and hopefully get you in the range of 5 to 5.5 volts. 5.5 is the maximum rated voltage for your Atmega chip on there. Keep in mind this is a hack and should be done with caution. I do not recommend this method unless you're willing to potentially fry your board.