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Hi Ed
I discovered a few thing about the MS14a you might
be
interested in. I am using two of the Eagleeye sensors out side and they
were terrible about false triggering. Here is what I did.
1. Raised the value of R15 to 330k this decreased
the
sensitivity to small IR changes. I will probiblly go to 470k. It
appears the limit is about 1 Meg before it no longer triggers. On my
board the 1 Meg above it on your diagram is R20 and resistor on the
output of U2B is a 1K chip resistor on the back of the board.
2. I tried changing C12 to .1 Mfd as you did, but
with
the higher trigger level the sensor missed slow movement. I went back
to 1Mfd.
3. I changed R11 to 220K to move the light / dark
trip
point brighter, and added a short piece of black heatshrink tube about
3/8 inch long to the CdS sensor to reduce its field of view. This
prevents my units from seeing local lights and gives a better reading
on natural light levels.
4. As with any IR motion sensor, they must not be
able
to see the sky. I blocked the upper row of circles in the lens with a
piece of black tape, to prevent the sensor from viewing up. This got
rid of the last false triggers.
These changes have eliminated false triggers and
now
small motion like birds and squirls don't cause triggers. I am using
the sensors to trigger a DVR to record security cameras, so I can also
see the cause of the triggers.
Thanks for your efforts and the posting of the
schematics. They were very helpfull.
Bryan Lee
|
The pictures below are a recent purchase of something X10 pro is calling the PMS03 outdoor motion sensor. In reality, it is the MS16A Active Eye motion sensor. Two components, RX and URX, seem to take it from a MS14A to a MS16A. R16 is removed from the board and the white jumper wire grabs ahold of the two added components. URX adjusts the off delay time from 1 to 60 minutes when the delay time has been set to the 1 blink mode only. A new capacitor was added down around the coil, I'm not sure what that is all about, perhaps bypassing? ![]() The back side of the board contains two surface mount resistors R19 and R20 and a couple of surface mount capacitors up in the RF area. Both resistors would differ with your on line schematic. R20 is 1K on this board and you show 1M. R19 is a 470 ohm resistor in series with the green LED, you show a diode (with R19 label) in that location. The other difference is R1, (to the left of the green LED). It is shown as zero ohms on the schematic, a 68 ohm resistor is in that location. Your board picture shows the same 68 ohm resistor. Thank you again for all of your X10 stuff, I've enjoyed it. It is stuff you can get no where else. Bob |