user13891: I found an LCD for my Arduino Mega 2560 that's parallel (I like that, I don't like SPI), but it works at 3.3V and isn't 5V tolerant. That's why I'd need to use level shifters, but that would use too much space and I'd like to power the microcontroller with 3.3V. But that would cause problems because the USART communication is set to be on 5V and that can't be changed.
Is there a way to power my Arduino at 3.3V? Is there an alternative Arduino for that?
Also, if there is, I'd need to have a 16MHz crystal on it. I know it's overclocking, but Gamebuino works at 16MHz on 3.3V and I would like to do the same.

user186: Have you considered maybe using the Inhaos Buono Mega 2560 (see a), also called the Inhaos Mega2560?
As far as I can tell, it is pretty much identical hardware as the Arduino Mega 2560 -- including the ATmega2560 processor -- except it has a selector to run the ATmega2560 at 3.3 V, so its I/O pins can be directly connected to 3.3 V modules.
Like many websites, every page on the Inhaos website http://www.inhaos.com/ has a "Contact Us" link at the top of each page. Click that link to get a list of several ways to contact the company.

user186: Have you considered maybe using the ElecFreaks Freaduino MEGA2560 ?
It has an identical I/O arrangement and dimensions as the Arduino Mega 2560 -- including the ATmega2560 processor. It has a selector to run the ATmega2560 at 3.3 V, so its I/O pins can be directly connected to 3.3 V modules.
The voltage regulators and reset switch position are better than the Arduino Mega 2560.

user186: Have you considered maybe using the "Sparkfun Mega Pro 3.3V" plus a "SparkFun FTDI Basic Breakout - 3.3V" ?
It uses the same ATmega2560 processor and has the same I/O arrangement as the Arduino Mega 2560, but it runs off 3.3 V.
It doesn't have the 16 MHz crystal you wanted, but if you really insist on overclocking, perhaps you could replace its 8MHz resonator with a 16 MHz crystal?


user186: Have you considered maybe using the Iteaduino MEGA2560?
The Iteaduino MEGA2560
uses the same ATmega2560 processor as the Arduino Mega 2560,
but is physically much smaller, the size of a Arduino UNO.
It has a switch to run the ATmega2560 at 3.3 V, so its I/O pins can be directly connected to 3.3 V modules.
It breaks out all the GPIO pins of the ATmega2560,
so it actually has more I/O on its connectors than the Arduino Mega 2560.
If I'm reading this right, the Iteaduino schematics and a typical Iteaduino features list
seems to say it already has a 16 MHz crystal.

13891: <p>I found an LCD for my Arduino Mega 2560 that's parallel (I like that, I don't like SPI), but it works at 3.3V and isn't 5V tolerant. That's why I'd need to use level shifters, but that would use too much space and I'd like to power the microcontroller with 3.3V. But that would cause problems because the USART communication is set to be on 5V and that can't be changed.</p>

<p>Is there a way to power my Arduino at 3.3V? Is there an alternative Arduino for that?</p>

<p>Also, if there is, I'd need to have a 16MHz crystal on it. I know it's overclocking, but Gamebuino works at 16MHz on 3.3V and I would like to do the same.</p>
 186: <p>Have you considered maybe using the Inhaos Buono Mega 2560 (see <a href="http://www.inhaos.com/newsview.php?news_id=44" rel="nofollow">a</a>), also called the <a href="http://www.inhaos.com/product_info.php?products_id=117" rel="nofollow">Inhaos Mega2560</a>?</p>

<p>As far as I can tell, it is pretty much identical hardware as the Arduino Mega 2560 -- including the ATmega2560 processor -- except it has a selector to run the ATmega2560 at 3.3 V, so its I/O pins can be directly connected to 3.3 V modules.</p>

<p>Like many websites, every page on the Inhaos website <a href="http://www.inhaos.com/" rel="nofollow">http://www.inhaos.com/</a> has a "Contact Us" link at the top of each page. Click that link to get a list of several ways to contact the company.</p>
 186: <p>Have you considered maybe using the <a href="http://www.elecfreaks.com/estore/freaduino-mega2560-white-color-mb-frdn011.html" rel="nofollow">ElecFreaks Freaduino MEGA2560</a> ?</p>

<p>It has an identical I/O arrangement and dimensions as the Arduino Mega 2560 -- including the ATmega2560 processor. It has a selector to run the ATmega2560 at 3.3 V, so its I/O pins can be directly connected to 3.3 V modules.
The voltage regulators and reset switch position are better than the Arduino Mega 2560.</p>
 186: <p>Have you considered maybe using the <a href="https://www.sparkfun.com/products/10744" rel="nofollow noreferrer">"Sparkfun Mega Pro 3.3V"</a> plus a <a href="https://www.sparkfun.com/products/9873" rel="nofollow noreferrer">"SparkFun FTDI Basic Breakout - 3.3V"</a> ?</p>

<p>It uses the same ATmega2560 processor and has the same I/O arrangement as the Arduino Mega 2560, but it runs off 3.3 V.
It doesn't have the 16 MHz crystal you wanted, but if you really insist on overclocking, perhaps you could replace its 8MHz resonator with a 16 MHz crystal?</p>

<p><a href="https://i.stack.imgur.com/2J8Ov.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2J8Ov.jpg" alt="Sparkfun Mega Pro with resonator circled"></a></p>
 186: <p>Have you considered maybe using the <a href="https://www.itead.cc/iteaduino-mega-2560.html" rel="nofollow">Iteaduino MEGA2560</a>?</p>

<p>The <a href="http://wiki.iteadstudio.com/Iteaduino_MEGA_2560" rel="nofollow">Iteaduino MEGA2560</a>
uses the same ATmega2560 processor as the Arduino Mega 2560,
but is physically much smaller, the size of a Arduino UNO.
It has a switch to run the ATmega2560 at 3.3 V, so its I/O pins can be directly connected to 3.3 V modules.
It breaks out <em>all</em> the GPIO pins of the ATmega2560,
so it actually has more I/O on its connectors than the Arduino Mega 2560.</p>

<p>If I'm reading this right, the <a href="ftp://imall.iteadstudio.com/IM120410003_Iteaduino_MEGA_2560/Documents/SCH_IM120410003_Iteaduino_MEGA_2560.pdf" rel="nofollow">Iteaduino schematics</a> and a <a href="http://www.epictinker.com/Iteaduino-MEGA-2560-p/dep024.htm" rel="nofollow">typical Iteaduino features list</a>
seems to say it already has a 16 MHz crystal.</p>
