PIR AM312/412/612
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I guess answering my own question, I removed my load switch as well as all of the capacitors from my breadboard circuit, and the remaining am612 circuit still appears to function just fine. :)
@NeverDie said in PIR AM312/412/612:
I guess answering my own question, I removed my load switch as well as all of the capacitors from my breadboard circuit, and the remaining am612 circuit still appears to function just fine. :)
It's a somewhat surprising result, because even the cheapskate am312 sensors appear to use caps:
https://www.aliexpress.com/item/Mini-IR-Pyroelectric-Infrared-PIR-Motion-Human-Sensor-Automatic-Detector-Module-high-reliability-12mm-x-25mm/32749737125.html?spm=2114.01010208.3.32.JSXzcv&ws_ab_test=searchweb0_0,searchweb201602_5_10152_10065_10151_10068_10130_10084_10083_10119_10080_10082_10081_10110_10178_10136_10137_519_10111_10060_10112_10113_10155_10114_437_10154_10056_10055_10054_10182_10059_303_100031_10099_10078_10079_10103_10073_10102_10120_10052_10053_10142_10107_142_10050_10051-10120,searchweb201603_49,ppcSwitch_4&btsid=b87e2064-287c-4fe9-ba44-53ca575f5350&algo_expid=3e550c0f-0a35-465b-8691-27d092d21bbd-4&algo_pvid=3e550c0f-0a35-465b-8691-27d092d21bbd
I coun't three caps there. Surely not all of them are there because of the LDO? -
@NeverDie said in PIR AM312/412/612:
I guess answering my own question, I removed my load switch as well as all of the capacitors from my breadboard circuit, and the remaining am612 circuit still appears to function just fine. :)
It's a somewhat surprising result, because even the cheapskate am312 sensors appear to use caps:
https://www.aliexpress.com/item/Mini-IR-Pyroelectric-Infrared-PIR-Motion-Human-Sensor-Automatic-Detector-Module-high-reliability-12mm-x-25mm/32749737125.html?spm=2114.01010208.3.32.JSXzcv&ws_ab_test=searchweb0_0,searchweb201602_5_10152_10065_10151_10068_10130_10084_10083_10119_10080_10082_10081_10110_10178_10136_10137_519_10111_10060_10112_10113_10155_10114_437_10154_10056_10055_10054_10182_10059_303_100031_10099_10078_10079_10103_10073_10102_10120_10052_10053_10142_10107_142_10050_10051-10120,searchweb201603_49,ppcSwitch_4&btsid=b87e2064-287c-4fe9-ba44-53ca575f5350&algo_expid=3e550c0f-0a35-465b-8691-27d092d21bbd-4&algo_pvid=3e550c0f-0a35-465b-8691-27d092d21bbd
I coun't three caps there. Surely not all of them are there because of the LDO? -
Has anyone here run across a highly directional version of either the AM312/612 or some other PIR sensor?
I have an application (https://forum.mysensors.org/topic/7388/how-to-detect-wild-animal-pests-in-a-windy-garden/1) which would benefit from that.
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Is there an SMD version of the PIR AM312/412/612 (it may have a different number, of course)?
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Closing the loop on my earlier questions, I finally did some long overdue experiments involving the AM612. It turns out that the 75K and 100K resistors aren't doing much, if anything. They can be replaced with simple shorts. So, in future designs, I'll be eliminating them.
On the other hand, the 1Megaohm resistor appears to be necessary. If I simply removed it, the PIR no longer did detections. If I put it back, the PIR worked again.
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At time index 6:20 this guy finds that using the AM312 is a solution to his intermittent problems that he was having with a the more commonplace PIR sensor:
https://www.youtube.com/watch?v=jpjfVc-9IrQ -
Just a quick question about these AM612 sensors.. What is the shortest trigger delay that can be achieved by connecting the SENS pin to ground? The datasheet suggests that by connecting ONTIME to ground a 2.3s "ontime" would be created, but does this also apply to the triggering delay?
I'm asking as I'm planning on using these sensors to switch on lights at home and obviously would like to have as little delay as possible between the actual detection and output trigger. AM312 seems to have a fixed ~2s delay, but how is it with the more tunable AM612? Maybe @NeverDie has some first hand experience?
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(A lot of the comments in that video mention MySensors :-) )
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Just a quick question about these AM612 sensors.. What is the shortest trigger delay that can be achieved by connecting the SENS pin to ground? The datasheet suggests that by connecting ONTIME to ground a 2.3s "ontime" would be created, but does this also apply to the triggering delay?
I'm asking as I'm planning on using these sensors to switch on lights at home and obviously would like to have as little delay as possible between the actual detection and output trigger. AM312 seems to have a fixed ~2s delay, but how is it with the more tunable AM612? Maybe @NeverDie has some first hand experience?
@chacal said in PIR AM312/412/612:
I'm asking as I'm planning on using these sensors to switch on lights at home and obviously would like to have as little delay as possible between the actual detection and output trigger. AM312 seems to have a fixed ~2s delay, but how is it with the more tunable AM612? Maybe @NeverDie has some first hand experience?
The output trigger is triggered as soon as the movement is fixed. A fixed delay of 2 seconds, here we mean that the HIGH level will be on the output trigger for 2 seconds.
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Closing the loop on my earlier questions, I finally did some long overdue experiments involving the AM612. It turns out that the 75K and 100K resistors aren't doing much, if anything. They can be replaced with simple shorts. So, in future designs, I'll be eliminating them.
On the other hand, the 1Megaohm resistor appears to be necessary. If I simply removed it, the PIR no longer did detections. If I put it back, the PIR worked again.
@neverdie hello, can you please provide the final schematic which one worked best for you with minimum no. of components
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I updated the board, and it's now 23mmx24.5mm:
It also has pads for an LED for range testing purposes.
@neverdie is this board without any capacitors working well??I want to test AM612 so I want testing circuit that works well
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@neverdie is this board without any capacitors working well??I want to test AM612 so I want testing circuit that works well
@just4-electronics In also using the setup(am612) from NeverDie, and I'm pretty pleased with it. I mapped an extra cap to the setup but that's just for my pease of mind. 😀
