tahirahmed
New Member
Hello,
I need some help in the motion detector circuit which i have built recently using this manual available online
https://www.electro-tech-online.com/custompdfs/2008/07/UltrasonicMotionDetector-1.pdf
I haven't purchased the kit for it i have paid money to a professional PCB maker who designed the PCB for me using the layout given in the manual I have verified the PCB using layout, it seems okay, then i have purchased the parts from the market and sold them very carefully. Also i have verified them after soldering using the layout and schematic given in the manual.
Now the problem is that whenever i power up the circuit the LED which should trigger on motion detection is turned on continuously, also the output signal is on always no matter i cover the ultrasonic sensors or change the sensitivity level using variable resistor the circuit remains on always.
Now the only changes i have made in this circuit are
1. I have used non-polarized capacitors rather than capacitors which have polarity to avoid the mistakes in polarity.
2. I am using a 39.270 KHZ crystal rather than a 40 KHZ crystal (40 KHZ is mentioned in manual) because exact 40 KHZ crystal is not available in the market here so i have chosen the closest value of 39.270 KHZ. Both ultrasonic sensors operate on 40 KHZ.
so please tell me does anyone built this circuit and verified it ? Also please tell me that does the changes i have mentioned above can cause this circuit to operate in an abnormal way (Always ON).
Please help me out i need this device for my project. Thanks in advance.
I need some help in the motion detector circuit which i have built recently using this manual available online
https://www.electro-tech-online.com/custompdfs/2008/07/UltrasonicMotionDetector-1.pdf
I haven't purchased the kit for it i have paid money to a professional PCB maker who designed the PCB for me using the layout given in the manual I have verified the PCB using layout, it seems okay, then i have purchased the parts from the market and sold them very carefully. Also i have verified them after soldering using the layout and schematic given in the manual.
Now the problem is that whenever i power up the circuit the LED which should trigger on motion detection is turned on continuously, also the output signal is on always no matter i cover the ultrasonic sensors or change the sensitivity level using variable resistor the circuit remains on always.
Now the only changes i have made in this circuit are
1. I have used non-polarized capacitors rather than capacitors which have polarity to avoid the mistakes in polarity.
2. I am using a 39.270 KHZ crystal rather than a 40 KHZ crystal (40 KHZ is mentioned in manual) because exact 40 KHZ crystal is not available in the market here so i have chosen the closest value of 39.270 KHZ. Both ultrasonic sensors operate on 40 KHZ.
so please tell me does anyone built this circuit and verified it ? Also please tell me that does the changes i have mentioned above can cause this circuit to operate in an abnormal way (Always ON).
Please help me out i need this device for my project. Thanks in advance.