“Dual Core” Arduino

Arduino Technology

Becky Stern is a Content Creator at Autodesk/Instructables, and part time faculty at New York’s School of Visual Arts Products of Design grad program. Making and sharing are her two biggest passions, and she's created hundreds of free online DIY tutorials and videos, mostly about technology and its intersection with crafts. Find her @bekathwia on YouTube/Twitter/Instagram.

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April 14th, 2008 4

John Ryan on the Arduino forums says:

Here’s 2 ATMega168’s sharing one 16mHz resonator, one reset switch, two 10k resistors, one 220ohm resistor, and two LED pilots. I used a mini USB adapter and uploaded the LED blink test to both chips, and as Paul [Badger] suspected, they are perfectly synchronized – I’ve tested numerous resets, and the start up blink sequence and blink demo on both, are identical.

I don’t need synchronized chips, but I happen to have a use for 2 168’s connected via i2C – not sure if anyone else does but it adds a lot of pins and a second serial buffer for an almost next to nothing outlay. This can be put together using 1 RBBB and a second chip with the boot loader installed, so that’s quite inexpensive, so long as you’ve got got a mini USB adapter laying around.

Synchronized ATMega168s sharing compenents on the Arduino forums, via Hack a Day.