Is 9V too much for Arduino?

Is 9V too much for Arduino?

9V is not a good input voltage to produce 5V through a linear regulator. Most Arduino boards have an external voltage input, and a range of 7-12V is recommended. So 9V seems perfect.

How many pins Arduino IO?


Digital I/O Pins 14 (of which 3 provide PWM output)
Analog Input Pins 6
DC Current per I/O Pin 40 mA
Flash Memory 8 KB

Can Arduino short circuit?

Short circuits on Arduino pins, or attempting to run high current devices from them, can damage or destroy the output transistors in the pin, or damage the entire Atmega chip. Often this will result in a “dead” pin in the microcontroller but the remaining chip will still function adequately.

Is it possible to destroy an Arduino input pin?

It shouldn’t be possible to destroy your pin by shorting input to output. Input pins can handle Vcc-level voltage, so they should be able to handle the lower output voltage from the other pin. Also, they have a high impedance, so that should protect them from most things. (See Anindo’s answer on this same question for more details on this).

What happens if you short a VIN pin on an Arduino?

Shorting this VIN pin to any of the analog or digital pins of the Arduino ( other than specific pins which are protected by resistors) is very likely to destroy either the internal ESD diode / protection circuitry for that pin within the microcontroller, or destroy the microcontroller itself. This could be the cause of the problem.

What happens when an overvoltage fails on an Arduino?

This diagram shows the flow of current when overvoltage is applied to an I/O pin. If the internal protection diode fails open, then the overvoltage destroys the I/O pin. If the protection diode fails by shorting out, it’s even worse because now the overvoltage is applied to the entire +5V supply on the Arduino.

Can You short a GPIO pin on an Arduino?

Shorting a GPIO pin set on OUTPUT, HIGH to GND, or one set on OUTPUT,LOW to Vcc Using +5V to power the Arduino instead of Vin/USB. This is actually OK, but only as long as you do not: The 5V pin is not as protected as the Vin pin, and can end up destroying things.