Differences
This shows you the differences between two versions of the page.
|
iotcluj:labs:03 [2016/07/12 14:28] ioana_maria.culic |
iotcluj:labs:03 [2017/07/03 17:02] (current) ioana_maria.culic [The Setup] |
||
|---|---|---|---|
| Line 15: | Line 15: | ||
| First of all, you need to distinguish the anode from the cathode. The LED has two legs: one is longer, that one is usually the anode and the shorter one is the cathode. Another way of identifying them is by looking inside the LED. There are two metal parts in it. The smaller one is connected to the anode and the bigger one is connected to the cathode. | First of all, you need to distinguish the anode from the cathode. The LED has two legs: one is longer, that one is usually the anode and the shorter one is the cathode. Another way of identifying them is by looking inside the LED. There are two metal parts in it. The smaller one is connected to the anode and the bigger one is connected to the cathode. | ||
| - | {{ :iotcluj:labs:led-blink-schematics.png?300 |}} | + | {{ :iot2016:labs:led-blink-schematics.png?300 |}} |
| To understand the anode and the cathode of the LED, imagine these two following situations: | To understand the anode and the cathode of the LED, imagine these two following situations: | ||
| - The cathode is connected ,through the resistor of course, to the ground. This means that the anode will be wired to the GPIO pin, which has to be //High// in order to make the LED light up. | - The cathode is connected ,through the resistor of course, to the ground. This means that the anode will be wired to the GPIO pin, which has to be //High// in order to make the LED light up. | ||
