<h2>Insanely Small Complete Microcontroller Development Board</h2>
<img class="alignnone wp-image-3552" src="https://eduengteam.com/wp-content/uploads/2021/03/Insanely-Small-Complete-Microcontroller-Development-Board-300x169.jpg" alt="Insanely Small Complete Microcontroller Development Board" width="376" height="212" />

[embed]https://youtu.be/uFd-PihO4l0[/embed]

https://youtu.be/uFd-PihO4l0
<p class="hckui__typography__bodyL">Creating minimalist solutions within tight constraints is one of Alun Morris' passions. Their latest design is the insanely small <a class="hckui__typography__linkBlue" href="https://www.instructables.com/Insanely-Small-AVRArduino-Microcontroller-Developm/" rel="nofollow">T402 Atto microcontroller development board</a>.</p>

<blockquote>"You can buy some absolutely tiny Arduino development boards,e.g. the Beetle (20x22x3.8mm) and the 32-bit Seeeduino XIAO (20x17.5x3.5mm) but I wanted to see how far I could push it without a custom PCB."</blockquote>
<p class="hckui__typography__bodyL">T402 Atto forgoes the typical ATtiny85 used in most teeny MCU implementations. Instead,it saves 1.27mm of width by using an ATtiny402 0-series chip in a narrow SOIC package. The microcontroller features 4 kilobytes of program flash,256 bytes of RAM,and 128 bytes of EEPROM. Like similar AVR chips,its clock can run up to 20MHz.</p>

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<p class="hckui__typography__bodyL">Even though the microcontroller only has eight pins,it packs significant functionality and flexibility into them. Five pins are available for input and output. Typical buses and peripherals like analog-to-digital converter,touch controller,SPI,I2C,and timers are also available. The sixth pin is unique since it is a UPDI programming pin.</p>
<p class="hckui__typography__bodyL">UPDI stands for <a class="hckui__typography__linkBlue" href="https://microchipdeveloper.com/atmelice:updi" rel="nofollow">Unified Program and Debug Interface</a>. Proprietary to AVR XMEGA chips,UPDI replaces the previous generation two-wire physical interface. A benefit to UPDI is that programmers are very inexpensive. For example,here are instructions to use a <a class="hckui__typography__linkBlue" href="https://create.arduino.cc/projecthub/john-bradnam/create-your-own-updi-programmer-1e55f1" rel="nofollow">Nano to create a UPDI programmer</a> for less than $10. If you have a high-voltage UPDI programmer available,you can change the programming pin's function to an input pin instead.</p>

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<p class="hckui__typography__bodyL">At the base of the T402 Atto is a 1.27mm "matrix" protoboard. This array of prototype holes makes it possible to attach the processor and solder 0805-sized components. Morris added 1.27mm headers to the design to make the I/O pins more accessible.</p>
<p class="hckui__typography__bodyL">The entire microcontroller is only 6x6x8 millimeters! Though,the board gets slightly less teeny if you add a programming header.</p>
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<a href="https://www.hackster.io/news/insanely-small-t402-atto-is-a-complete-microcontroller-development-board-cd1a121f8e5b?utm_source=Hackster+Marketing&amp;utm_campaign=d5e6aaba16-EMAIL_CAMPAIGN_2019_02_14_02_53_COPY_01&amp;utm_medium=email&amp;utm_term=0_86d76c4d75-d5e6aaba16-144429707&amp;mc_cid=d5e6aaba16&amp;mc_eid=c0d451d378">Source</a>

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Insanely Small Complete Microcontroller Development Board

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Insanely Small Complete Microcontroller Development Board

Insanely Small Complete Microcontroller Development Board

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