Ultrasonic sensor circuit design

Thread Starter

AlCapown3d

Joined Aug 14, 2014
1
Hello,

I´m trying to design a sensor circuit for this ultrasonic sensor:
my http://files.voelkner.de/500000-524999/505679-da-01-en-ULTRASCHALL_SENSOR_KPUS_40FS_18R_448.pdf

This is my current design:


I use an Arduino Mega 2560 with USB as power supply and serial connection.

I build a transmitter circuit with 24V supply for transmitter. I use the tone library to feed the gate of the mosfets with 40kHz.

My problem is that my sensor circuit only receives the signal within a 10cm distance. I want to get to 1m distance and since I try to use this circuit for trilateration I want the circuit to be as time invariant as possible.

I currently don´t have an oscilloscope. For example I have no idea what C2 does, but without it I receive random noise constantly.
 

MrChips

Joined Oct 2, 2009
30,618
It would be difficult to design and trouble-shoot such a system without an oscilloscope.
It would be like shooting in the dark. You can't see your target or how far off you are from your target.
 

pwdixon

Joined Oct 11, 2012
488
If you are using an Arduino what was wrong with the standard HC-SR04 ultrasonic sensor people use on Arduino's? They even have a library to process the sensor already.
 
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