Configuring GPIO

To configure GPIO, perform the following:
Execute the following command to configure GPIO0:
```
cd /sys/class/gpio
echo 448 > export
```
Locate to the GPIO0 directory:
```
cd gpio448
```
Note: In this command, 448 represents the sys number of the pin. For more information, see GPIO Pinout.
Configure the direction of GPIO0 as in:
```
echo in > direction
```
Alternatively, configure the direction of GPIO0 as out:
```
echo out > direction
```
Configure the voltage level of GPIO0 as high:
```
echo 1 > value
```
Tip: You can use an oscilloscope to check the voltage level.
Configure the voltage level of GPIO0 as low:
```
echo 0 > value
```
Tip: You can use an oscilloscope to check the voltage level.
Connect the 3.3V Power pin with the GPIO0, and check the voltage level of GPIO0:
```
cat value
```
Connect the GND pin with the GPIO0, and check the voltage level of GPIO0:
```
cat value
```