Two of these pins (on 40-pin Pi’s, just one on 26-pin Pi’s) can be designated for hardware PWM output too. There are 8 general purpose digital I/O pins – these can be programmed as either digital outputs or inputs. ![]() ![]() ![]() The original Raspberry Pi Model A and B version B1 was a $35 single board computer with a 26-pin General Purpose Input/Output (GPIO) connector and this carries a set of signals and buses.
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