Motion Sensor Switch for alarm, light or water sprinkler
The Motion Sensor Switch circuit is a motion sensor controlled automatic water sprinkler but you can easily add an alarm/light function too. Before beginning the construction contact your nearest electronics component vendor and procure a readymade box-type Passive Infrared (PIR) Motion Sensor unit. Such units, packed in a compact enclosure with power input and relay output terminals are widely available.
In prototype, an unbranded (Made in China) PIR Motion sensor with the following specifications are used.
- Detection Range:10Meter Maximum
- Supply Input:12V DC, <500mA
- Relay Output :Common(C),Normally Closed(N/C),Normally Opened(N/O)
- Relay ON time: 15 Secs (Not Adjustable)
Now install the PIR module hanging from a 3 metre high mast (to cover 10 metre radius area) and connect its supply and relay terminals to our finished and enclosed circuit, observing right polarity. A 4-core screened cable can be used for this interconnection. Power the circuit from a regulated 12VDC adaptor/solar power box.
Whenever the PIR module detect movement of a live body its relay output toggles and the switching mosfet (T1) in the circuit is switched to on via resistor R1 and related parts. As as result, the EM relay at the output of T1 is activated and the electric sprinkler gets its supply through the relay (RLY1) contacts. This contacts (or spare contacts) can also be used to activate a high-power warning alarm.
Please note that, here T1 is wired as a mini electronic timer. Even after the PIR relay switched off, output relay (RLY1) remains in on state for a short duration decided by the value of timing capacitor C2.
Motion Sensor Switch Circuit Schematic
The Electric Sprinkler
18 Responses to “Motion Sensor Switch for alarm, light or water sprinkler”
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helo,i am interested with this circuit,,pls give me info abt d PIR unit..name and brand coz i dnt knw were to find here saudi arabia…tnx
also abt d timer ckt,can i add a diode forwrd to the gate of mosfet?so that when PIR switch off,no voltge reach on its output frm the charged capacitor…hope u knew weat i mean,sori for my poor english,,tnx,more power!!!
Thanks for your interest! Readymade PIR sensor boxes are easily available and you can purchase the same from electronics super markets too.Otherwise search in google to locate the nearest dealer in Saudi Arabia.
No need to add a diode because,the low value capacitor C2 slowly discharges through R2.Futher when PIR is in off state,the relay contacts are also in “open”condition.If you wish to use a PIR with solid-state output (ie transistor switched output instead of the relay),such an alteration may become necessary.
sir, i really appreciate your contribution in electronics, sir i want to join you and really want to work with you sir. am 19 years of age from Nigeria, i will be so happy if you accept my wish sir . thanks
Thanks for the ckt. i am interested PIR based motion detector, could you explain how to connect 3 terminal PIR sensor (i.e. Drain, source and gate type) with your ckt.
Thanks in advance,
Vinit
You can’t directly connect a 3-pin PIR sensor component in this circuit.Addition of a complex signal conditioning& switching circuit is required to drive the output relay.Here we are using a ready-made PIR sensor module.Anyway,I will try to add a circuit using the sensor component,mentioned by you in near future.
Thanks for your early prompt reply. could you give hint on how to test 3 pin sensor and connections to drive relay or LED. I have tested the same sensor by connecting source pin to +5V DC, drain to Amp i/P, GND pin to ckt comman GND. Contineous o/p of 1.565-1.655V at Amp o/p was measured, but no change in voltage when human body comes within the coverage. Please help to solve the problem.
Vinit
I am working in project and i want to ask about its connection with PLC if its possible to do so ,and isn’t it comes with its own conditioning circuit ?
thanks for your effort
Hello………….
i want to know how to make motion sensor circuit.so if you know some information about that circuit.plz inform me…….
sir i want to make a security alarm with automatic light switch..can you help me in making my project.
hello sir i analyzed the circuit above.I have a question to ask that,will this circiuit serve for switching on a normal room light.
Helo sir,
I just wnat to know that is there any specific number or code for PIR for this circuit?
hi i have a question about the circuit above i see you are using a ready made pir sensor and im trying to use one as well Honeywell IS-215T and the pins that are avaiable on the senor are +,-, C, N/C and 2 x T i was wondering if it is possible to use the circuit above to this pir sensor and if possible where to i connect the N/O part as it is not on the Pir sensor i have
Thank you
sir,
i seen your circuit which is very reliable circuit but it should be light dependent. plz send me thecircuit which is light dependent
how can i connect this cct with 16f84 pic
Hi, I’m also interested in this circuit. But my problem is the only PIR available here in our country has only 3 pins. Can you help me solve my problem and apply this kind of PIR in your circuit? tnx.
hey i am using first time PIR sensor gor motion detection of robots……i have no idea how can i use these sensors with my PIC18F452…..if anybody know plz help me
Any drive circuts…..!!!
Hi
Iam interested in building the motion sensor/sprinkler as above.I am having difficulty in locating suppliers of a 240v soleniod switch and the PIR .im in the UK and suggestions or at least the manufacturer of the one shown
Hola me interesa tener mas informacion sobre un aspersor de agua que se active con el movimiento, una cosa mas bien domestica, yo estoy en bogota, Colombia. Importante precios