varuntejavarma
New Member
Hello,
I want to build a Low cost proximity sensor for an automatic sense and spray device and i have choosen IR reflective property for this application. I have modulated the signal at 38khz frq and used a tsop38 sensor at detector side. But, I could acheive only a range of 10 cms. I have also tried using high intensity IR led's. I have tried different means but I could not acheive a long range with IR sensor.
1. In general, I want to know, what is the maximum range of detection possible using a low cost IR sensor with 5v supply??
In the mean time i have bought this product and opened the circuit.
**broken link removed**
It consists of only one diode. but i dont know which type of sensor it is. It cannot be PIR sensor. I think it triggers output with the change of light falling on it. It works very well upto 1.5 metre. The yellow led is just to indicate the status of the freshner. it blinks to show that the freshner is ready to detect any movement. if its stable it means the freshner is in sleep mode after completing a spray.
The actual detection is done by the large diode. It works on passive detection. so there is no transmitter in the circuit. And it is not even pir sensor.
my observation:
when an obstacle is in front of the sensor, it doesnt trigger the output. it triggers only when the obstacle moves away. by this i think it works on movement of shadows. maybe it takes in the surrounding light as default and when there is a obstacle movement there would be change of light and the output is triggered. This is what i am thinking. I am not sure. Is there any possibility for a diode to work in that way. If yes, which type of diode is used and how does it work.
How to find out which type of sensor is used in this circuit.
how does this sensor work and what is its principle.
It would be very helpfull if anyone could assist me in this project. It is my first project in electronics and i am tring the method of learning by doing and got no help around me
I want to build a Low cost proximity sensor for an automatic sense and spray device and i have choosen IR reflective property for this application. I have modulated the signal at 38khz frq and used a tsop38 sensor at detector side. But, I could acheive only a range of 10 cms. I have also tried using high intensity IR led's. I have tried different means but I could not acheive a long range with IR sensor.
1. In general, I want to know, what is the maximum range of detection possible using a low cost IR sensor with 5v supply??
In the mean time i have bought this product and opened the circuit.
**broken link removed**
It consists of only one diode. but i dont know which type of sensor it is. It cannot be PIR sensor. I think it triggers output with the change of light falling on it. It works very well upto 1.5 metre. The yellow led is just to indicate the status of the freshner. it blinks to show that the freshner is ready to detect any movement. if its stable it means the freshner is in sleep mode after completing a spray.
The actual detection is done by the large diode. It works on passive detection. so there is no transmitter in the circuit. And it is not even pir sensor.
my observation:
when an obstacle is in front of the sensor, it doesnt trigger the output. it triggers only when the obstacle moves away. by this i think it works on movement of shadows. maybe it takes in the surrounding light as default and when there is a obstacle movement there would be change of light and the output is triggered. This is what i am thinking. I am not sure. Is there any possibility for a diode to work in that way. If yes, which type of diode is used and how does it work.
How to find out which type of sensor is used in this circuit.
how does this sensor work and what is its principle.
It would be very helpfull if anyone could assist me in this project. It is my first project in electronics and i am tring the method of learning by doing and got no help around me