💬 AM612 Passive Infrared Sensor Breakout Board

[NeverDie]

@sundberg84 said in 💬 AM612 Passive Infrared Sensor Breakout Board:

Are you happy with this sensor? I mean, compared to HC-SR501 this must be a breeze to use on a PCB (size and 3 resistors only?)?
How do you grade it in motion detection compared to HC-SR501? Is this a sensor you recommend if you want to build a motion dec PCB?

Answers: yes, yes, don't know, yes

[NeverDie]

I updated the module to be plug compatible with the Multi-Sensor:
https://www.openhardware.io/view/510/Multi-Sensor-TempHumidityPIR-LeakMagnetLightAccel

[NeverDie]

Updated files to version 503 so that the PIR is better centered above the multi-sensor.

[Omemanti]

Looks awesome, do you by chance have the schematic as a PDF?

[NeverDie]

@omemanti said in 💬 AM612 Passive Infrared Sensor Breakout Board:

Looks awesome, do you by chance have the schematic as a PDF?

OK, I just now uploaded the PDF schematic for version 506, which is a newer (more simplified) version than the actual gerber files. I'll update the gerber's later. Version 506 is the most current version.

[Omemanti]

@neverdie Thankyou!

[NeverDie]

i uploaded all the files now for version 506, which is the most current version. Version 506 requires fewer components than earlier designs.

[BC547]

The link to the PIR lens does not seem to work anymore (404 not found error).
Did you try e.g. https://www.aliexpress.com/item/10PCS-Infrared-Sensor-8308-4-mini-White-Fresnel-Lens-body-pyroelectric-PIR/32780943866.html ? This lens seems even smaller. Or are there disadvantages to being too small?

[NeverDie]

@bc547 said in 💬 AM612 Passive Infrared Sensor Breakout Board:

Or are there disadvantages to being too small?

Optics aren't as good. Also, unless the radio and power source are equally small, you don't get the advantage of the smaller size.

[waspie]

does anyone have a sample sketch for this. i don't understand the whole pin assignment thing well enough to know what the heck i'm doing.

I grabbed the sketch from the 10 year pir but this seems much more geared to the nrf52

[mfalkvidd]

@waspie just use the same sketch and wiring as in https://www.mysensors.org/build/motion except that AM612 wants 3.3V instead of 5V.

[waspie]

@mfalkvidd
yeah, I don't think that's working. I think I may understand better why not, so correct me if I'm wrong.

The low power comparator only works on analog inputs and in the nrf51 board by @NeverDie the SCL marked pin on the board is tied to P0.10 which has no analog input on it.

So, what I think I need to do is cut the trace and re-route it to the INT marked on the board which is tied to P0.03 which is analog 1 (AIN1). At that point then I think I only need to change the line in the sketch to use pin 3 instead of 2.

[mfalkvidd]

@waspie sorry. I didn't realize you're using NRF5. I thought you wanted to connect it to a "regular" Arduino like Nano or Pro Mini.

I don't have any experience with NRF5 unfortunately, but hopefully someone else can help.

[Omemanti]

@waspie you might want to look at one of my projects on openhardware. It has a sketch on it. It also uses the am612

[waspie]

Thanks.
I'm really not too good at writing arduino code but I did come across this library:
https://github.com/mristau/Arduino_nRF5x_lowPower

Is this something that could be incorporated into the sketch and then use "normal" interrupts?

[nagelc]

Don't cut your trace just yet. You can use normal interrupts with MySensors and NRF5, at least if you are sleeping the node. I have used the normal Mysensors sleep statement, with interrupts for buttons, and not had to use the LPCOMP. The motion sensor should work similarly. I have used interrupts on P0.27 for a button interupt, which is regular GPIO pin and not an analog pin. I have also used 2 interrupts in the sleep statement, which means the MySensors NRF5 code probably uses GPIOTE instead of LPCOMP for interrupts. Might not be as low power as LPCOMP, but it seems to be more flexible.
I used an NRF52832, haven't tried with a NRF51 board.

[Omemanti]

@nagelc I also use normal interrupts. No problems here. Up to 22uA while sleeping, that's fine by me. (3 AAA will last a long time)

[waspie]

yeah well i got a few nrf51822 which was evidently a big mistake

[Omemanti]

@waspie why?

[waspie]

They don't seem to play well and seems like most or any of you guys messing with NRF5x are preferring nrf52.

I have however figured out one problem. Whenever my nrf51 was sleeping i was seeing 1ma current which is a deal killer. I accidentally discovered that disconnecting the st link and replugging it got sleep current to ~5ua. Something about uploading the program puts it in some state whereby it won't sleep properly.

So, I can get it to sleep all the way down now and I'm starting to understand the psel refsel stuff. And, I can make it trigger on p0.03 (an4 or 5, whatever) but its not particularly reliable. I need to get this section right:

void activateLpComp() {
  NRF_LPCOMP->PSEL=4; // monitor AIN0 (i.e. pin P0.02 on nRF52832 PIR Motion Sensor v607).
  while (!(NRF_LPCOMP->PSEL==4)) {} //wait until confirmed
  NRF_LPCOMP->REFSEL=2;  // choose 1/2 VDD as the reference voltage
  while (!(NRF_LPCOMP->REFSEL==2)) {} //wait until confirmed
  NRF_LPCOMP->ANADETECT=0;  //detect CROSS events on PIR detection pin
  while (NRF_LPCOMP->ANADETECT!=0) {} //wait until confirmed
  NRF_LPCOMP->INTENSET=B1000;  //Enable interrupt for CROSS event
  while (!(((NRF_LPCOMP->INTENSET)&B1000)==B1000)) {} //wait until confirmed
  NRF_LPCOMP->ENABLE=1;  //Enable LPCOMP
  while (!(NRF_LPCOMP->ENABLE==1)) {} //wait until confirmed
  NRF_LPCOMP->TASKS_START=1;  //start the LPCOMP
  while (!(NRF_LPCOMP->EVENTS_READY)) {}  //wait until ready
  
  NVIC_SetPriority(LPCOMP_IRQn, 15);
  NVIC_ClearPendingIRQ(LPCOMP_IRQn);
  NVIC_EnableIRQ(LPCOMP_IRQn);
}```