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January 6, 2013
about 5 years ago
Sparkfun - Please retire this product! This is a BAD board design - very difficult to work with on a breadboard. The pin spacing (as noted in comments some 4 years ago!) are incorrect, and the SCL/SDA connections are in a very inconvenient/breadboard unfriendly location. In addition, the board size is such that it covers needed holes on a solderless breadboard.
My suggestion - if you are working on a breadboard is to NOT use this part. Get a 28-pin version from another vendor and an IC socket and you'll be good to go. Not to mention there are better chips from NXP and Microchip.
ARRGH! The board as received on 3/26/2015 has INCORRECT spacing between the left and right set of edge-holes. If I set a digital vernier to .800 and lay it along the holes - there is an OBVIOUS mis-match. Which means common .1 headers soldered in will be spaced wide and not go into a standard breadboard. By eye, it looks like the spacing is about .830. Yet another example of the "Fine QC" our Chinese friends are giving us - and that Sparkfun is sleeping at the switch and not doing a thorough QC on incoming parts!
Now I'll have to go back and check all the BOB's I've recently purchased... Sad.
about 5 years ago
OMG - what a HUGE PITA the naming convention used on the pins of this board!! It is a real nightmare to try and remember that R1IN is RS232 but T1IN is TTL/5V!
I hope you redo this board some day and come up with a more intuitive pin-naming convention. Serial comms is always confusing (who is sending, who is receiving.. ) - Also it would be really super if you brought out the Enable pin as well.
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