Pin Number Symbol. Description. 1. A. Retriggerable & non-retriggerable mode select. (A=1: re-triggerable). 2. VO. Detector output pin (active high). 3. RR1. BISS is a PIR (passive infra-red) controller, using analog mixing digital design technique and manufactures by CMOS process. With special noise immunity. hobbyist sensors use the BISS ("Micro Power PIR Motion Detector IC") BIS Datasheet ( (the decoder chip used).

Bis0001 Pdf

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It also compatible with BISS ○. CMOS high input impedance operational amplifiers. ○. Bi-directional level detector / Excellent noise immunity. ○. Built-in. BIS, PIR sensor IC, PIR Motion detection circuit, PIR ultrasonic sensor controller ic, PIR motion detector chip, PIR sensor Technical Datasheet [PDF - DB]. In this post, Learn more about BISS Part number: BISS Functions: Micro Power PIR Motion Detector IC. Package information: DIP.

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These are by nature noise-sensitive. You'll have to poke around to see what is false triggering. Noise into the trigger is an obvious one but also the comparator stuff on the input of the BISS. Try and isolate the two circuits pull R3 to see what is getting triggered by the noise.

Check the PCB layout as well.

BISS0001 Datasheet (data sheet) PDF

You want that 12V relay stuff to be by itself, not sharing power or ground paths with the 5V PIR stuff. It could easily discriminate between noise and signal.

The later ones have built in analog stuff as well. Underside of nighlight PCB. Click to expand image.

The fun is on the underside. The datasheets for these have a reference design which look very similar to the layout of this PCB.

The board is powered by the two parallel banks of 4 x AAA alkaline cells. Each bank supplies approx 5.

A diode in series with each bank prevents one bank from driving the other in reverse which can cause alkaline cells to leak. A linear regulator provides a 3. We can apply an RC circuit to the mosfet that grounds pin 9.

After testing I found that a 33uf capacitor with k resistor works best for me. When we turn on the PIR, the capacitor starts charging and because it starts charging, the voltage on the k resistor starts at 8. But what if the PIR was turned on and then 10 seconds later it was turned off?

Also read: IO SONO DIO PDF

The capacitor would still hold charge for at least seconds or so; if we turned the PIR back on it would send the start up trigger. My initial idea to solving this was to hook up a mosfet with a resistor that would drain the capacitor after the PIR was off but things were getting too complex. After looking for a solution, I remembered that most power supplies use an optocoupler to give feedback to the low voltage circuit from the high voltage circuit.Click to expand image.

One of the IC pins can be tapped to drive digital IO line for occupancy detection or an intruder alarm.

Maybe it can't do 20min with the adjustability you need? I couldn't find a good datasheet that showed the max time for the BISS.

We need to go back to the BISS datasheet to see what we can do. So its a complex pattern of primary and secondary signals, with the strongest effect most likely to be the primary signal straight from the device transmitter Also just to complicate matters, the OpAmp IC is configured so that the output is always trying to return to a steady state.

For many basic projects or products that need to detect when a person has left or entered the area, or has approached, PIR sensors are great. You'll have to poke around to see what is false triggering.