Chapter 6. Supplementary Materials

6.1. Hardware, some remarks

PIN13 (GPIO21 on old models or GPIO27 on new ones) should be avoided for presentations, as you sometimes do not know in advanced whether it is a PI-B Rev 1 or later. handelt.

The resistors are calculated to yield prox 10mA current. GPIO allow up to 16mA.

The LED allow reverse voltage of 5V. Wrong polarity is no problem.