Xojo for loop how to#
Xojo for loop code#

// This function will work in any mode, and does not need root privileges to work. // The pin number is supplied in the current mode – native wiringPi, BCM_GPIO, // physical or Sys modes. This is accomplished via a suitable call to the gpio utility program, // so it need to be available. with the gpio program), but if you specify one // of the other types, then the pin will be exported and initialised as specified. If it is INT_EDGE_SETUP then no // initialisation of the pin will happen – it’s assumed that you have already // setup the pin elsewhere (e.g. The edgeType parameter is either INT_EDGE_FALLING, INT_EDGE_RISING, // INT_EDGE_BOTH or INT_EDGE_SETUP. Protected Const EDGE_FALLING = 1 Protected Const EDGE_BOTH = 3 Protected Const EDGE_RISING = 2 Protected Const EDGE_SETUP = 0 Protected Function WIringPiISR (pin as integer,edgeType as integer, p as ptr ) As Integer //This function registers a function to received interrupts on the specified pin. You can set the Timer to 1000 or maybe 500 depending on what responsiveness your looking for. We just have a Window here with one Listbox on it and one Timer. That way event is never lost and timer or whatever method you use to poll does not need to be very intensive. So the idea is we have a safe function that only logs the interrupt then we poll the log. When using interrupts then we must be really careful to not call anything from within the interrupt since Xojo does not support that. Polling the interrupt counter you can do at low intervals making your Raspberry PI not hog the CPU, and still not miss any events as the interrupt handler has logged them down.

Xojo for loop code#

So usually you will want to use interrupts if you can.īut but wait, the interrupt code polls also!! Why is polling any better than polling?

If just polling the hardware then you need to poll it in really tight loop which will occupy your Raspberry PI a lot, also even if you poll in really tight loop then you still can miss events. In my example then I have it connected as follows: (Inspect your sensor carefully for markings, I have seen sensor of this type that had the pins in different order, mine had no markings on it so I just had to know the pin order) (5V) Red is the 5V input – I always use red for the power input.Note that when shown on the breadboard the sensor is shown from the other side, so check the picture above to make sure the wires go in right place. This one we found no name for except just “Mini IR Pyroelectric Infrared PIR Motion Human Sensor Detector Module”

Xojo for loop how to#

Specs on its output pin on the net were fluctuating from 3.3V to 4 V so I measured just in case and found it to be 4.4 V ! Click here for guide on how to secure the GPIO pin for 4.4 V to be able to use this sensor. WARNING do not attempt to connect it directly to the GPIO pin like the other sensors. If you got the one shown on the picture bellow then this one is the smallest one, we found no official name on it but its sold as “Mini IR Pyroelectric Infrared PIR Motion Human Sensor Detector Module”. It is easy replacement, on the ST-00082 yellow will go to OUT, red to VDD, and blue to GND. If you got the ST-00082 then the spec is very similar.

Also if your not familiar with breadboards and placing the cobbler then click here. Make sure that your Raspberry PI is not turned on when your wiring it up. If you are not familiar with breadboards or not familiar with how to place a cobbler on the breadboard then click here bellow Wiring PI Xojo module from Paul Lefebvre.Or one of the other sensors that we have listed above. HC-SR501 sensor (They go as low as $0.78 on Aliexpress where I got this one from probably even lower if you buy more than one unit).Incorrect wiring can result in damaged sensor or damaged Raspberry PI. We do not take any responsibility for possible errors in the guide or errors that you might do wiring it up. I found this sensor to be excellent, it gives readings when I expect it to and not readings when I don’t expect it to. May 2016, adding Mini IR Pyroelectric Infrared PIR Motion Human Sensor Detector module) Oct 2015, adding code with interrupts and changed setup to use a breadboard) Mini IR Pyroelectric Infrared PIR Motion Human Sensor Detector Module Infrared motion detector sensors that we have tested Name