There are two types of pin numbering, the physical numbering or mode BOARD, and the numbering of the chip SoC Broadcom controlling them, We are going to use the pinout in mode BCM, but let's look at the difference.
Kuna aina mbili za pin namba, ya kimwili namba au hali BODI, na namba ya chip ya SoC Broadcom que los controla, Sisi ni kwenda kutumia pinout ya hali ya BCM, lakini Hebu tuangalie tofauti.