Projects / Project Swiftlet Original post date: 05/20/2015
Here are the couple of really old ultrasonic transducers that I bought a long time ago. The one on the left is MA40A3R (receiver) and the one on the right has a T30 marking. (transmitter)Microchip AN1536 Ultrasonic Range Detection There are quite a bit of technical back information on interfacing the sensor.
The equivalent circuit would comes in handy when it comes time to simulate the driver circuit.The ringing time limits the minimum distance that the range finder can be used. It is not an issue for this application as the distance is going be less than what I am going to be used as the proximity alert.
Prowave App Notes:
Prowave AP050830: Selection and use of Ultrasonic Ceramic Transducers
The nice thing about my placement is that my head will be blocking the beam going to the other sensor. Still I am going to alternate the rangefinder to avoid interference and reduce current consumption.
This one is quite a bit farther and the results are encouraging too. Looks like that Chinese ultrasonic range finder PCB works better than I thought.
I am going to order a few and try to see if I can improve on the design in fine tuning for size, weight and power consumption. Ideally I would like to use the same transducer for transmit and receive.
Other websites:
http://www.kerrywong.com/2011/01/22/a-sensitive-diy-ultrasonic-range-sensor/
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