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Topic: Number of I/O pins on the mini Pro? (Read 2 times) previous topic - next topic


I need as many I/O pins on the Arduiuno Mini Pro as possible. The info for this Arduino says it only has 14 Digital I/O but looking at the schemtic I see that PC0- PC5 = 6 , PD0-PD7 = 8 and PB0-PB6 = 6 I/O. This adds up to be 20 I/O. One of these has an LED on it and two are for the Rx/Tx for programming. Why does the doc say on 14 are available?


6 of the pins are analog and thus not described as "digital". They can still be used as digital I/O, so yes it does essentially have 20 I/O pins. Just a matter of how they're described is all.

James C4S

FYI... often overlooked, A4 and A5 on the Pro Mini are actually right above A3 and A2.
Capacitor Expert By Day, Enginerd by night.  ||  Personal Blog: www.baldengineer.com  || Electronics Tutorials for Beginners:  www.addohms.com


If you're reeeeeally careful, you can get 2 more Analog inouts (only!), A6/A7, by adding wires to  ATMega328  pins 19 & 22.

"In the TQFP and QFN/MLF package, ADC7:6 serve as analog inputs to the A/D converter.
These pins are powered from the analog supply and serve as 10-bit ADC channels."

Not sure what you'd have to do software wise to access those.
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.


And while you're at it connect to AREF (chip pin 20) too...
[ I won't respond to messages, use the forum please ]

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