Editing Alvaro

{{stub}}
{{infobox dcontroller
| name         = 
| designer     = Ariamella ([[Geekhack]] username)
| license      = [http://www.apache.org/licenses/ Apache License 2.0]
| port         = USB Type C
| uc           = ATMega32U4
| ucvoltage    = 5V
| ucclock      = 16 MHz
| iopins       = 24
| iovoltage    = 5V
| ram          = 2.5 KB
| progmem      = 32 KB
| eeprom       = 1 KB
| bootloader   = DFU
| schema       = https://github.com/Ariamelon/Alvaro
}}

The '''Alvaro''' is an open-hardware microcontroller board designed by '''Ariamella'''.
It was based on the [[Goldfish]] revision C. It is mostly backwards-compatible with [[Pro Micro]] but features a mid-mounted USB type C port and more I/O pins.

==Differences to Pro Micro==
===Changes===
* The USB port is mid-mounted USB-C, which is both through-hole and SMD mounted. It should be tougher and not as easily torn off as the USB micro B port on the original [[Arduino Pro Micro|Pro Micro]].
* The silk-screened print on the board lists ATmega32U4 port and bit numbers, not Arduino pin numbers.
===Additions===
* Five additional I/O pins are exposed on the short edge. Same as [[Elite-C]] and [[Goldfish]].
===Omissions===
* No LEDs. The PB0 pin has not become available for use though.
* It has no voltage regulator and runs only on +5V.

==Differences to Goldfish==
===Changes===
* Uses 0603 components instead of 0402, with much tweaked layout. These changes are intended to make the Alvaro easier to solder than the [[Goldfish]].
* USB-breakout pins have been moved, but are still on a 2.54 mm grid.
===Additions===
* Pin numbers are silkscreen-print on both sides of the circuit board.

==Bugs==
* Revision 1.1 has the silkscreen-prrint for pins D5, F0 and F1 wrong.

==Pinout==
Microcontroller side:
{| class="wikitable"
|-
! colspan="2" |Arduino
!AVR
! colspan="5" |↑
!AVR
! colspan="2" |Arduino
|-
| colspan="3" |
! colspan="5" |USB port
| colspan="3" |
|-
| colspan="3" |&nbsp;
| colspan="5" rowspan="13" |(picture)
| colspan="3" |&nbsp;
|-
|TX
|D1
|PD3
| colspan="3" |RAW (VBUS)
|-
|RX
|D0
|PD2
| colspan="3" |GND
|-
| colspan="3" align="right" |GND
| colspan="3" |Reset
|-
| colspan="3" align="right" |GND
| colspan="3" |Vcc (+5V)
|-
|SDA
|D2
|PD1
|PF4
|D21
|A3
|-
|SCL
|D3
|PD0
|PF5
|D20
|A2
|-
|A6
|D4
|PD4
|PF6
|D19
|A1
|-
|
|D5
|PC6
|PF7
|D18
|A0
|-
|A7
|D6
|PD7
|PB1
|D5
|SCLK
|-
|
|D7
|PE6
|PB3
|D14
|MISO
|-
|A8
|D8
|PB4
|PB2
|D16
|MOSI
|-
|A9
|D9
|PB5
|PB6
|D10
|A10
|-
| colspan="3" |
|PB7
|PD5
|PC7
|PF1
|PF0
| colspan="3" |
|}

*Internal pins: D+, D-

==Availability==
The design is open source. All builds have been made by hobbyists.

==See also==
* [[Goldfish]] — the design that the Alvaro is based on
* [[Elite-C]] — similar features and layout but is thicker.

==External links==
* Geekhack — [https://geekhack.org/index.php?topic=109111 Alvaro USB C Pro Micro Clone]
* [https://github.com/Ariamelon/Alvaro Github repository]

[[Category:Controller boards]]
[[Category:Pro Micro]]
[[Category:ATmega32U4]]