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A max232 Based 'duino (March 8, 2008)
I, and some others it seems, have spotty results talking to the "official" Arduino serial boards and their Freeduino counterparts. To that end, I present a max232 based design, complete with Diecimila layout and DTR reset.
The resulting design is a double-sided board based on the Freeduino PTH and then modified to my liking. Currently, the design is still sitting in the manufacturing queue awaiting a spot on a panel, so treat as untested.
A PNG of the schematic is available; as are Eagle board and schematic files. These are labeled as V1.2
Some items of note:
- The 5V regulator is a surface mount 7805DT. If you don't need to use sheilds, or you're willing to mutilate your regulator, feel free to design a PTH version in.
- IC1 is an LDO 3.3 volt regulator. If you don't need the 3.3V header, you may omit IC1 and C8. If you do need 3.3v, choosing an appropriate regulator is left as an exercise for the reader.
- There is a SMT cap placed on the bottom of the board below the Atmega, feel free not to populate it..
- Like most Arduino knock-offs, C6 and C7 must be low-profile caps (like these) if you're going to use a shield.
- This board uses the _tSilk layer instead of tPlace. I've already gone to the trouble of trimming the _tSilk layer to the board confines.
Buy
I'm pleased to offer these as a kit, bare PCB, and fully assembled. Use the below options to purchase with-out the optional 3.3 volt supply or explore your other options.
| Full Kit | Board Only | Board with FT232 soldered |
|---|---|---|
Arduino (6)
Eagle3D (3)
Freeduino (6)
Kit (11)
MAX232 (2)
MaxSerial (2)
Serial (5)
Posted by spiffed at March 8, 2008 1:14 AM