The cathode on the symbol is the side with the line across the point of the triangle and the anode is the other side. When referencing a schematic (drawing of the electrical pathways and components using symbols), the symbol for the LED shows which way the current flows and allows you to connect the LED the correct way. This is important to remember since the leads may have been clipped. The lead that is closer to the notch is always the cathode. The second feature is a small flat notch on the side of the LED. Luckily, we can use an RGB LED module that comes with pre-built current-limiting resistors. This longer lead is the anode (+), and the shorter one is the cathode (-). To hook up RGB LED to ESP32, we gotta add current-limiting resistors.
The first is that LEDs have one lead that is longer that the other. To make it easier to identify the leads, all LEDs are manufactured with two physical properties. When connecting an LED it is important to be able to distinguish which lead is the anode (positive) and which is the cathode (negative).
Cathode led wiring how to#
Current flows from the anode to the cathode and never in the other direction, so it is important to know how to tell the anode and cathode apart. The positive side of the LED is the Anode and the negative side is the Cathode. I hope the figure below can solve this problem of identification. Thankfully this means that if we wire an LED in backward, it will not burn the whole system up, it just won’t come on. Since it is a diode, and diodes only let the current flow in one direction, an LED must be wired correctly for it to work. LEDs or Light Emitting Diodes don’t come with any labeling on it to identify Cathode (-ve,GND) or Anode (+ve).
An LED (Light-Emitting Diode) is an electronics component that emits light when it is powered.
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