external clock pins on arduino NANO

Other Hardware 3rd Party Boards
1

Hi,

Used google to find rather a simple question. What are the pins to use on the arduino nano v3.0 to connect a external crystal ?

On many schematics you find xtal1 xtal2, that's my way to know where to hook up the crystal. (hope that right :slight_smile:

But searching for a Nano schematic, it's doesn't clearly show which pins to use. ?!

I see on this LINK that the pins xtal1 and xtal2 are on pin pb6 en pb7 but not showing the Brown marker for arduino ?!

So comparing to this doesn't give me anything.

Is it possible to set a asynchronous operation of timer2 (32,768kHz) (ASSR = (1<<AS2); ) with a Arduino NANO ? And so, which pins ? :slight_smile:

*EDIT: is it already used by the quartz crystal build onto the nano........?

2

What are the pins to use on the arduino nano v3.0 to connect a external crystal ?

There are none. The Nano has an onboard crystal (or resonator, check the schematic) connected to the relevant pins.

Timer, I don't know.

3

See here

ArduinoNano30Schematic.pdf (200 KB)

4

Thx,!! Now I'm sure. Still learning and discovering more and more.

I have a Nano running a LCD (3-wire) (3pins), a mosfet for ledstrip dimming (1 pwm pin), two buttons for setting a stopwatch (2 pins).

I would rather use another chip like the attiny84 with more pins, but as I only know about attiny's you probably have another suggestion to use more permanent ?

I probably also need a crystal (2xtal pins) so I need alot of pins to get this working :slight_smile:

lcd 3pins
mosfet 1 pwm pin
two buttons 2 pins
crystal 2 xtal pins

Any suggestions what to buy or look for? (Considering costs the arduino's aren't that expensive any more but as you noticed, no external clock for more accuracy)

Thanks for your fast reply!

5

creamers:
Thx,!! Now I'm sure. Still learning and discovering more and more.

I have a Nano running a LCD (3-wire) (3pins), a mosfet for ledstrip dimming (1 pwm pin), two buttons for setting a stopwatch (2 pins).

I would rather use another chip like the attiny84 with more pins, but as I only know about attiny's you probably have another suggestion to use more permanent ?

I probably also need a crystal (2xtal pins) so I need alot of pins to get this working :slight_smile:

lcd 3pins
mosfet 1 pwm pin
two buttons 2 pins
crystal 2 xtal pins

Any suggestions what to buy or look for? (Considering costs the arduino's aren't that expensive any more but as you noticed, no external clock for more accuracy)

Thanks for your fast reply!

Every Nano and Nano clone I have seen has an external crystal or resonator.

Good grief! If you want to build your own circuit,
Just use a 328P-PU and be done with it! The chip is cheap. Schematics are everywhere.
Put Optiboot on it or program with ISP.
Nick Gammon

Or, buy a $3 mini pro 328 from China. My supplier usually hits home delivery in 10 days. Buy then in 5x quantity to get free shipping.

Ray