The post illustrates an industrial motion sensor circuit using a couple of LDRs, an IC and a few other passive components. The circuit senses the movement of a cylinder illuminating the appropriate LEDs for the required detection. The idea was requested by Mr.Hasnain.
sir how are you, i have sent you request on Google account, i am not
sure that you got my messages or not, so i am sending you my problem here
again, please help me out... plzzzzzz plzzzz, i shall be very thankful
to you, i hope you will understand my problem and solve it...
height A > height B.
come in front of sensor A. ( at this time RED light should turn ON and GREEN turn OFF).
moving downward cylinder will come in front of sensor B. ( this should
make no difference, i,e RED should remain ON, and GREEN should remain
cylinder will start moving upward, first it will move away from sensor
B. ( at this time RED should turn OFF and GREEN turn ON), then moving
upward cylinder will move away from sensor A, ( this should make no
difference. i,e RED should remain OFF and GREEN should remain ON)..
At this position both the sensors sensorA (LDR1) and sensorB (LDR2) are able to receive the lights from the relevant laser beams focused at them.LDR1 switches ON BC547 transistor while LDR2 does the same for BC557 and keeps it triggered.
Next, the cylinders reverts and starts moving upwards and in the course unblocks the LDR2 beam allowing the BC557 to conduct, and yet again the positive pulse from the transistor is allowed to hit the IC pin#14 resulting in the restoration of the previous situation i.e. now green LED illuminates and the RED shuts off.As the cylinder moves past LDR1, BC547 also switches ON, but produces no effect due to the same reasons as explained above.
The above motion detection cycle keeps repeating in response to the specified cylinder movement.