This is the quick start guide for the Driver for PIR sensor, with step-by-step instructions on how to configure and use the driver in a selection of use cases.

The use cases contain several code fragments. The code fragments in the steps for setup can be copied into a custom initialization function, while the steps for usage can be copied into, e.g., the main application function.

HC-SR501 Driver use cases

Create and initialise the driver

The following must be added to the project:

#include <hcsr501.h>

hcsr501_p hcsr501Inst = NULL;

Add to application initialization:

Initialise the driver:
hcsr501Inst = hcsr501_create(&PORTE, PE5);

if ( NULL != hcsr501Inst )

{

// Driver created OK

// If NULL is returned the driver is not created!!!

}

How to test if the sensor detects anything

In this use case, the steps to perform a detection is shown.

Note: The driver must be created Create and initialise the driver before a detection is possible.

if ( hcsr501_isDetecting(hcsr501Inst) )
{
       // Something is detected
}
else 
{
       // Nothing is detected
}