As we can see in the following comparative picture of the two reviews, the second revision of the PI has two pins +5V, five of GROUND (grounding), two of +3,3V, eight pins General purpose GPIO, five SP10, two UART, and two pins I2C1.
Kama tunaweza kuona katika Picha inayofuata ya kulinganisha ya kitaalam mbili, marekebisho ya pili ya PI ya ina vigingi mbili +5V, tano za ARDHI (grounding), wawili wa +3,3V, vigingi nane Mkuu lengo GPIO, tano SP10, mbili UART PATANIFU, na vigingi mbili I2C1.