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Author Topic: Single-sided Arduino-Leonardo board  (Read 4837 times)
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Not getting what you think is the problem frank.
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

Málaga, Spain
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The vinciDuino board is up and running beautifully:
- UART working
- USB working
- I2C operational
- ISP
- digital IO, well I've only tested D13.
- all supplies are good (external unregulated, USB, and UART).

Little picture from the vinciDuino board saying its first hello world!


* vinciDuinoRevA_I2c.jpg (137.06 KB, 600x686 - viewed 35 times.)
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Cave
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...


* pcb-view-top.jpg (165.07 KB, 1001x749 - viewed 43 times.)
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Dubuque, Iowa, USA
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Not getting what you think is the problem frank.

The ATMega32U4 has a thermal pad on its underside.

Oddly the datasheet makes no reference to it whatsoever except for the footprint drawing which shows that it is present.
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http://www.atmel.com/Images/7766S.pdf
See sections 7.2 & 7.1.

The exposed pad only applies to the QFN44 (quad flat no-lead package) and not the TQFP44 (thin profile plastic quad flat package) as used on the previous post.
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

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