SparkFun Forums 

Where electronics enthusiasts find answers.

Have questions about a SparkFun product or board? This is the place to be.
By micropuller
#142282
Am I correct in understanding that when I want to use and i2c device together with a pro micro, I have to hook it up to pins D2 and D3 instead of the usual A4 and A5, which aren't broken out on this board?
So when I want to use an i2c device, I have the same number of remaining analog pins and two less digital pins compared to when using an arduino pro mini?
By derricka
#163299
For i2C connections to Sparkfun Pro Micro or Arduino Micro, physical wiring is as follows:

SDA connects to Arduino Micro pin Labeled 2 (not A2)
SCL connects to Arduino Micro, pin Labeled 3 (not A3)
GND connects to GND

POWER: i2C devices usually require power. Pins may be labeled VCC, 5V or 3V. (*** BE CAREFUL HERE ***) This may be connected to Arduino Micro under the following conditions.
1) The i2C device consumes less current (ma) ,at all times, than your Arduino can provide.
2a) The i2C device consumes the same voltage that your Arduino provides.
2b) The i2C device consumes the less voltage that your Arduino provides, but has an added regulator that lowers the voltage to the correct level. Here's a trick: Place three 1N4007 diodes in series, to drop 5V down to 3V if you don't have a proper regulator on hand.
long long title how many chars? lets see 123 ok more? yes 60

We have created lots of YouTube videos just so you can achieve [...]

Another post test yes yes yes or no, maybe ni? :-/

The best flat phpBB theme around. Period. Fine craftmanship and [...]

Do you need a super MOD? Well here it is. chew on this

All you need is right here. Content tag, SEO, listing, Pizza and spaghetti [...]

Lasagna on me this time ok? I got plenty of cash

this should be fantastic. but what about links,images, bbcodes etc etc? [...]