Ultrassonic transducer switching

Question

Hi,

I'm currently making a distance sensor for a drone with some ultrassonic transducers ( one transmitter and one reciever ) but I have only the room for one of these .

I wanted to use a analog switcher but I couldn't find the right one.

What other device could I use ?

Thxs.

Nico

BigG · Accepted Answer

This Sharp IR sensor may do the trick. It claims distance detection from 1m up to 5m GP2Y0A710K0F SHARP, Distance Measuring Sensor, Optoelectronic, 550 cm, Analogue, 4.5 V to 5.5 V | Farnell UK

nicoloquinte · Answer

that was a good idea but I prefer this one (much smaller) http://www.mouser.fr/ProductDetail/STMicroelectronics/VL53L0CXV0DH-1/?qs=sGAEpiMZZMvzNxwKcL67%252bvkB1KBqITa79O7MZJAmmoU%3d

nicoloquinte · Answer

I have also a little budget

BigG · Answer

Not sure if this is within your budget: https://www.seeedstudio.com/Crazyflie-2.0-Flow-Deck-p-2920.html

nicoloquinte · Answer

Not a bad idea ,i will study this option but its accurate to only 2 M and iI need a bit more than 3.5 meters

dougw · Answer

You could try using the same transducer for send and receive like Maxbotix sensors.

nicoloquinte · Answer

That was my idea but I wanted to know what I could use to switch between the recieving and transmitting modes (can't use an analog swither or give me the right one )

DAB · Answer

At that distance you are better off going to LIDAR.

At >3.5 meters, the sound wave has greatly dissipated and the return echo will be miniscule and very hard to detect unless you go to a parabolic reflector.

The LIDAR can take you to at least 50 m with reasonable detection rates with simple optics included in the kit.

DAB

dougw · Answer

The receiver circuit can be connected continuously. The transmitter circuit can be disconnected by an analog switch such as TS5A3166 TS5A3166DBVR TEXAS INSTRUMENTS, Analog Switch, Single Channel, SPST, 1 Channels, 0.9 ohm, 1.65V to 5.5V, SOT-23, 5 Pins,…

nicoloquinte · Answer

Uh thats seems a little bit pricy but sounds like a good idea

nicoloquinte · Answer

The transmitter recieves 15v ac so ... I don't know if that is possible with this component

michaelkellett · Answer

You don't need a switch - you are trying to do exactly what car reversing sensors do - so there is a load of stuff on the web. I've done some of this work - here's a bit of circuit that I've used: The transducer goes between SE1 and ground, pulse D1 to drive the transducer, take the signal at PR1 to S10 on the filter. D1 and R19 protect Q1 from the huge voltage at SE1 when the transducer is driven. Most cheapo reversing systems work like this, although they often use a dedicated chip rather than discrete components. This is the bandpass filter and drives a 12 bit ADC on a micro. There are single chips that will do this for you. You can buy transducers, transformers etc from Farnell (and lots of other places too). MK

Ultrassonic transducer switching

Top Replies

http://www.mouser.fr/ProductDetail/STMicroelectronics/VL53L0CXV0DH-1/?qs=sGAEpiMZZMvzNxwKcL67%252bvkB1KBqITa79O7MZJAmmoU%3d

http://www.mouser.fr/ProductDetail/STMicroelectronics/VL53L0CXV0DH-1/?qs=sGAEpiMZZMvzNxwKcL67%252bvkB1KBqITa79O7MZJAmmoU%3d