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This is my own design - UNOs and Nano are getting scarce... and pricey...

I laid it out as per my own preference - Bus oriented - 2 x 8 bit parallel buses and 1 x 6 bit.

It has a socketed ATmega328P, although the socket doesn't show in the 3D rendering.
No crystal - runs on it's internal 8MHz clock - which frees up 2 more GPIOs.
Jumper selectable +5V or 3V3 operation so you can connect to your 3V3 sensors.
There is no USB to UART on-board - designed to use a CP2102 board..
optional header for a 3V3 regulator.
No LEDs included - keeps battery life up...  They can be installed optionally.

Separate I2C header designed to use an 0.91" OLED display.  An example sketch for the OLED is available on my GitHub.

There are 100s of possible header pin possibilities so it is priced with none - see the related products tab to grab the ones you want.

rev. 0.9 now in stock

more info on my github WIKI.      Design Goals.

This is my own design - UNOs and Nano are getting scarce... and pricey...

I laid it out as per my own preference - Bus oriented - one 8 bit, and two 6 bit parallel buses.

It has a socketed ATmega328P, although the socket doesn't show in the 3D rendering.
You can choose a 16 or 20 MHz crystal.

There is no USB to UART on-board - designed to use a CP2102 board.. although there is no reason you could not use an FTDI, for example.
But you would have to use jumpers to connect it to the CP2102 header.

LEDs are installed optionally - in case you are running on battery.

Separate I2C header designed to use an 0.91" OLED display.  An example sketch is available on my GitHub.

There are 100s of possible header pin combinations - see the related products tab to grab the ones you want when ordering a BareBones.

I'm happy to announce that rev. 0.9 came out proto-perfect (electrically, at least)  You can program it just like an Arduino UNO.  I recommend you use the miniCore board package if using 20MHz.

The mechanical layout error prevents the use of downward facing pins on the A0-A6 header for bread board installation.  Will be fixed in rev. 1.0

The Kit includes MPU with bootloader, socket, crystal, 2 LEDs and headers.
Feel free to ask for the configuration of your choice. ( LED colour, male/female headers etc.)

Chinese UNO clone that uses the Massduino MD328D MCU.

very similar to the ATmega328p  with the following extras:

+5 or 3v3 operation - Switch selectable

10/12/16 bit ADC... as in

   analogRead()              // 10bit ADC, Compatible to UNO R3

   analogRead_12bits()   // 12bit ADC , 130 sps

   analogRead_16bits()   // 16bit ADC , 125 sps

Will work with UNO boards package except timing is wrong
so delay and baud rates don't work right.

Best to download the ver 5.1 OR BETTER boards support zip.
Installation instructions are included - old fashioned - need
to copy files into a 'hardware' directory in your 'Sketches folder'.

Here is the link to the download...
http://www.inhaos.com/downcount.php?download_id=218

Note there are quite a few "non-official" packages out there that DO NOT work...  Make sure you have rev 5.1 or better.

This is the rev. 1.0 - my own design - UNOs and Nano are getting scarce... and pricey...

I laid it out as per my own preference - Bus oriented - one 8 bit, and two 6 bit parallel buses.

It has a socketed ATmega328P, although the socket doesn't show in the 3D rendering.
You can choose a 16 or 20 MHz crystal.... or no crystal and use a chip set to 8MHz or less.

There is no USB to UART on-board - designed to use an FTDI board.. although there is no reason you could not use a different adapter.
But you would have to use jumpers to connect it to the FTDI header.

LEDs are installed on the board but need to be enabled by shorting a solder pad on the bottom - in case you are running on battery.

Separate I2C header designed to use an 0.91" or 0.96" OLED display.  An example sketch is available on my GitHub.

There are 100s of possible header pin combinations - see the related products tab to grab the ones you want when ordering a BareBones.

You can program it just like an Arduino UNO.  I highly recommend you use the miniCore board package, especially if you are using a clock other than 16MHz.

The Kit includes MPU with bootloader, socket, crystal and headers.
Feel free to ask for the configuration of your choice. (  male/female headers etc.)

Transparent Acrylic Enclosure for Arduino UNO