SunFounder Thales Kit, Manual, Page: 79 / 167

SunFounder Thales Kit for Raspberry Pi Pico, Release 1.0
1. Trigger Mode
Let’s take a look at the pins with jumper cap at the corner. It allows PIR to enter Repeatable trigger
mode or Non-repeatable trigger mode
At present, our jumper cap connects the middle Pin and L Pin, which makes the PIR in non-repeatable
trigger mode. In this mode, when the PIR detects the movement of the organism, it will send a high-
level signal for about 2.8 seconds to the main control board. We can see in the printed data that the
duration of work will always be around 2800ms.
Next, we modify the position of the lower jumper cap and connect it to the middle Pin and H Pin to
make the PIR in repeatable trigger mode. In this mode, when the PIR detects the movement of the
organism (note that it is movement, not static in front of the sensor), as long as the organism keeps
moving within the detection range, the PIR will continue to send a high-level signal to the main
control board. We can see in the printed data that the duration of work is an uncertain value.
2. Delay Adjustment
The potentiometer on the left is used to adjust the interval between two jobs.
At present, we screw it counterclockwise to the end, which makes the PIR need to enter a sleep
time of about 5 seconds after finishing sending the high level work. During this time, the PIR will no
longer detect the infrared radiation in the target area. We can see in the printed data that the dormancy
duration is always no less than 5000ms.
If we turn the potentiometer clockwise, the sleep time will also increase. When it is turned clockwise
to the end, the sleep time will be as high as 300s.
3. Distance Adjustment
3.4. Projects 75