I was inspired by this topic and bought some cheap modules from ebay:
http://www.ebay.com/itm/5-8GHZ-Microwave-Radar-Sensor-6-9M-Smart-Switch-for-Home-Control-/401082379029?hash=item5d625f6b15:g:4BMAAOSwxp9W2Ser
Does anyone know how to hook them up? Was anyone able to make them work? The chinese seller is not really helpful in providing some more details.
I really like the idea of having a motion sensor behind a wall (read: out of sight), even if it means powering it from a wall socket.
I started playing with the first module listed in my previous post:
The module is really as easy to connect as a normal pir sensor. There are small text on the pcb. The top most connection (indicated with a 'o') is the sensor output (3,3v for a high and 0v for a low). The middle connection is ground and the bottom connection is Vcc (3,3 to 20v according to the ebay listing).
My setup was really simple, just a chinduino powered via usb. The sensor connected to +5v, ground and the output to analog pin A0 (I could have used a digital pin).
The first results are really promising. Some characteristics:
Some range tests that triggered the output (note that this is probably not the maximum distance, just the stuff I tested):
Stuff that I still need to test:
Did someone succeed in fitting a pro mini and radio in the Molgan while still using the original pir?
It looks to me there isn't enough room for the additional components and I'm not sure what part of the pcb I can saw off while still being able to use the original pir.
Does anyone have an idea?
@drock1985, Didn't test it yet. I was playing with the other module I bought. Too bad that the other module only seems to work stable from 6V and up (I should have known it, as it was listed on ebay as 7-12v). I was just hoping that it would work at lower voltages. So I will probably stick with the first module for now.
@vil1driver, Yes, detection works through wall and door. I only tested it at a distance of about 5 meter with a brick indoor wall between me and the sensor. I also had to walk around before the sensor picked me up (just lifting my arm wasn't enough).
I started playing with the first module listed in my previous post:
The module is really as easy to connect as a normal pir sensor. There are small text on the pcb. The top most connection (indicated with a 'o') is the sensor output (3,3v for a high and 0v for a low). The middle connection is ground and the bottom connection is Vcc (3,3 to 20v according to the ebay listing).
My setup was really simple, just a chinduino powered via usb. The sensor connected to +5v, ground and the output to analog pin A0 (I could have used a digital pin).
The first results are really promising. Some characteristics:
Some range tests that triggered the output (note that this is probably not the maximum distance, just the stuff I tested):
Stuff that I still need to test:
I was inspired by this topic and bought some cheap modules from ebay:
http://www.ebay.com/itm/5-8GHZ-Microwave-Radar-Sensor-6-9M-Smart-Switch-for-Home-Control-/401082379029?hash=item5d625f6b15:g:4BMAAOSwxp9W2Ser
Does anyone know how to hook them up? Was anyone able to make them work? The chinese seller is not really helpful in providing some more details.
I really like the idea of having a motion sensor behind a wall (read: out of sight), even if it means powering it from a wall socket.
That was indeed the plan. 2 full batteries in series will start of at 3.0V and if they're empty, the voltage will have dropped to 1.6V
But to be fair, I'll be happy if it still works at 1.8V, because that’s the voltage the atmega328 will start to fail.
Thanx for the schematic. I didn't know the module was called GY-68.
Apparently the board isn't as complex as I thought. Just bypassing the regulator should do the trick.
I bought some cheap BMP180 breakout boards on ebay for use in a 2*AA battery sensor board.
Does anyone know how to modify such a board so it works using voltages lower than 3.3V?