User manual

19
Caution
Under no circumstances do you connect any GPIO pins to one another and wait to see what will happen.
Adhere to the following instructions:
Some GPIO pins are directly connected to terminals of the processor; a short circuit may totally ruin the
Raspberry Pi. A series resistor must always be interposed when connecting two pins with each other
using a switch or LED.
Pin 1, which supplies + 3.3V and a current draw up to 50 mA, is always used for logic signals. Pin 6 is the
ground wire for logic signals. The others pins 9, 14, 17, 20, 25 which are named Ground or 3V3 are
reserved for future add-ons. At present they can be used as labeled. However, you should not do that so
that you can also use your own projects on future Raspberry Pi versions.
Each GPIO pin can be programmed as output (e. g. for LEDs) or as input (e. g., buttons). GPIO outputs in
its logic state 1 supply a voltage of +3.3 V, in the logic state 0 0 Volt. GPIO inputs supply at a voltage of up
to + 1.7 V, the logic signal 0 , at a voltage between +1.7 V and +3.3 V, the logic signal 1 .
Pin 2 supplies +5 V as a power supply for external hardware. Here as much power can be drawn as the
USB power supply of the Raspberry Pi is able to deliver. Do not connect this pin to a GPIO input.
2.1 Components contained in the package
The learning package contains various electronic components that allow you to build the experiments
described (as well as your own). The components are only briefly introduced here. You will gain the essential
practical experience in dealing with them through the actual experiments.
• 2x breadboard
• 1x LED red
• 1x LED yellow
• 1x LED green
• 1x LED blue
• 4x button
• 4x resistor 10 kOhm (brown-black-orange)
• 4x resistor 1 kOhm (brown-black-orange)