3. Light up the first LED-EEWORLD

Collect

Understanding the schematic diagram - writing a driver

LED Module:

insert image description here

As can be seen from the figure, the LED anode is connected in series with a resistor (which plays a role in current limiting), connected to VCC, and the cathode is connected to port P2. To light up an LED, the corresponding IO needs to be given a low level (because the anode VCC is equivalent to a high level)

To name a pin:

sbit variable name = address value

(For example, sbit led=P2^0 means that the P20 port is named led, and it cannot be written as P2.0)

program:

#include

sbit led=P2^0; //The first LED light

void main()

{

while(1)

{

led=0; //Set led to low level

}

Reference address：3. Light up the first LED

Previous article：4. LED flashing
Next article：2.C51 basic programs and statements

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