varuntejavarma
New Member
Hello,
I have to design a circuit for a device to detect any motion in front of the device upto 2 metres. I have tried with Ir reflection sensor. but couldnt acheive the range. Then, I found out a circuit in internet which works on passive detection of shadows.
**broken link removed**
so, basically it takes in the ambient light and when there is a obstacle in front of the sensor, output is triggered. As mentioned in the circuit about using L14F1 as sensor, I could not get that part where i am living. So, I used a anormal phototransistor with some black sheilding around it. It seems to be working onfor 40 cms.
1. which type of sensor should i look out for. what are the specifications that i need to look for this application( detect fast change in light upto 2 metres with narrow detection)
2. My major problem is I do not know if this circuit works properly for fast light changes. I need to drive a dc motor at output for 5 sec whenever the sensor detects a movement upto 2 metres.
3. Is there any other kind of low cost and effective sensor or method for this kind of application??
I am a beginner to this field. I am willing to learn by doing. so,any suggestions or advices are greatly appreciated
Thanks in advance
I have to design a circuit for a device to detect any motion in front of the device upto 2 metres. I have tried with Ir reflection sensor. but couldnt acheive the range. Then, I found out a circuit in internet which works on passive detection of shadows.
**broken link removed**
so, basically it takes in the ambient light and when there is a obstacle in front of the sensor, output is triggered. As mentioned in the circuit about using L14F1 as sensor, I could not get that part where i am living. So, I used a anormal phototransistor with some black sheilding around it. It seems to be working onfor 40 cms.
1. which type of sensor should i look out for. what are the specifications that i need to look for this application( detect fast change in light upto 2 metres with narrow detection)
2. My major problem is I do not know if this circuit works properly for fast light changes. I need to drive a dc motor at output for 5 sec whenever the sensor detects a movement upto 2 metres.
3. Is there any other kind of low cost and effective sensor or method for this kind of application??
I am a beginner to this field. I am willing to learn by doing. so,any suggestions or advices are greatly appreciated
Thanks in advance