Arduino Uno Rev3 pinouts photo

[cysign]

Would you guys use an 8u2 or an 16u2 for own PCBs?
And why?

[testato]

It have usb inside, this is the most important difference respect 328.
It have also 2,5kB of ram, instead of 2kB

[westfw]

Would you guys use an 8u2 or an 16u2 for own PCBs?

No.  At the time Arduino switched to the 8u2, FTDI usb/serial chips were relatively expensive.  Since that time, FTDI has come out with a cheaper line of USB chips, competition has appeared in the form of Cypress, WCH, and low-priced "modules", and the AVRs have gotten more expensive.   On top of that, there are more chips with native USB (like the 32u4 used on Leonardo and Micro, or the SAMD21 on Zero)   The 8u2 change to Arduino allowed the older design to have new USB capabilities, but those usually aren't needed.  When they are needed, there are better solutions...

[GolamMostafa]

That mounting hole on the top left side was already hard to use and this time with the two additional pins it should be impossible to use now.

That mounting hole on the top left side was already hard to use and this time with the two additional pins it should be impossible to use now.

I would like to see redundant connectors (double connectors for DPin, APin and PPin Connectors) in the future manufacture of the ArduinoUNO Kits.

[GolamMostafa]

I am attaching a schematic diagram for ArduinoUNO board which I have made for myself, and it may be useful for others!

[SebastianCeronV]

How can I connect high voltage to an arduino?

[westfw]

How can I connect high voltage to an arduino?

Opto-isolators...

[KhaibariA]

I am about to make my graduation project. I want to know how to connect fan and also I face difficulties having the circuit diagrm for

[anishkgt]

Here is what i've been using

[steveC200]

Just beginning with direct port manipulation. My current project would benefit from reading all input registers as fast as possible, and then checking for which if any bits have changed.

Thinking it might be useful to have some look ups along the lines of the following function prototypes..

char mapPinToPort(byte pinNumber);
byte mapPinToBit(byte pinNumber);
byte mapPinAndPortToPinNumber(char port, byte pinNumber);

..hopefully the function names explain their purpose. that is to determine which port & bit a particular numbered pin is on. and also the reverse lookup.

wondering if anyone has done this yet? with conditional compilation to cover  the variants, and an agreement on "does not have such" values... it should be workable to cover all variants

[larryd]

Just beginning with direct port manipulation. My current project would benefit from reading all input registers as fast as possible, and then checking for which if any bits have changed.

Thinking it might be useful to have some look ups along the lines of the following function prototypes..

char mapPinToPort(byte pinNumber);
byte mapPinToBit(byte pinNumber);
byte mapPinAndPortToPinNumber(char port, byte pinNumber);

..hopefully the function names explain their purpose. that is to determine which port & bit a particular numbered pin is on. and also the reverse lookup.

wondering if anyone has done this yet? with conditional compilation to cover  the variants, and an agreement on "does not have such" values... it should be workable to cover all variants

Make a macro list that reads pins for each variant.
ex:
#define TESTd2      (PIND  & B00000100) // D2 is tested UNO
. . .

byte stateD2 = TESTd2;       //Read D2 Takes about 130ns

[Greenman]

Hi guys, like Czetie said I'm new hear and know as much about this stuff as the difference between my elbow & a!.
I acquired the  "GY-BMP280-3.3 Pressure Atmospheric Altimeter Module Sensor Tool U", pined it up to 4/5 and 5v pins got the bpm280 prog loaded up on my unoR3 opened serial monitor and off it went, fast ! but with the odd number a load of reverse question marks and the odd letter, question is, what have I done wrong, I'm using a iMac.
Help is alway very welcome guys.

[Aliazam]

Is this microcontroller compatible with Duemilanove type?
Thanks

[_pepe_]

Is this microcontroller compatible with Duemilanove type?

The microcontroller of the Arduino Uno is the same as the one on the last Duemilanove series.

The main differences between the two Arduino cards are a FTD232RL USB-to-serial interface circuit and a real 16 MHz crystal on the Duemilanove, instead of an ATmega146U2 and a ceramic resonator on the Uno. NB : the crystal is much more accurate and stable than the resonator.

As the Duemilanove is an older than the revision 3 of the Uno, its connectors have fewer pins.



Of course, both cards are Arduino-compatible.