Hi! I'm doing my project regarding 40khz ultrasonic sensor which will be used to get accurate distance measurements. I have a separate transmitter and receiver transducer. I want to get the time between the moment my transmitter transmitted the waves and the time my receiver received it. However, I…

Yes, I have an oscilloscope with me, so I know that indeed, the transmitter is working When I connect the probe on the receiver, it doesn't show any echo. It's as if it doesn't detect any reflected waves

I don't know the brand of the ultrasonic sensor I bought here in the Philippines Sir. All I know is that it's center frequency is 40 khz. And for the accurate measurement, may be a deviation of +-1cm would be alright. I'm concerned with the latter part of my code Sir. What I'm doing is getting the …

Hi, Can you measure the DC voltages on the points in this Rx diagram please, with respect to gnd with no signal being Tx. [ReceiverEdit.jpg] With the Tx pointing at the Rx what do you see on the scope at point G when you fire the Tx? What voltage scale/cm do you have the scope set too and do yo…

Jenifer3096: I don't know the brand of the ultrasonic sensor I bought here in the Philippines Sir. All I know is that it's center frequency is 40 khz. And for the accurate measurement, may be a deviation of +-1cm would be alright. I'm concerned with the latter part of my code Sir. What I'm doing …

I'm sorry, I'll get back to you regarding the DC voltage at that points. I just disassembled my receiver circuit now since I'm not sure if the resistor and capacitor values I used are right. Thanks Tom

Hi, Can you show what scope pattern you get at points A and B with respect to gnd please? [UltrasonicTransmitterEdit.jpg] Thanks.. Tom... :slight_smile:

Have you done anything about the problem with your code, that I discussed in reply #4 (the 1 second transmit ensures that ranging won't work). Also, the receiver amplifier is just a low pass filter with a 3 dB point of about 40 kHz. A bandpass filter, like the used in the HC-SR04 will work much be…

Yes @jremington , the delay I used is actually 300 microseconds (I just tried that 1 sec delay and wasn't able to change t, my bad). And to set the center frequency of the amplifier, I changed the capacitor and resistor values as I have said earlier Sir.

to set the center frequency of the amplifier Your low pass filter has a 3dB "cutoff" frequency, not a center frequency.

Ultrasonic transmitter and receiver using arduino uno

Projects General Guidance

TomGeorge April 14, 2018, 8:17am 19

Hi,
Can you show what scope pattern you get at points A and B with respect to gnd please?

Thanks.. Tom...

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Ultrasonic transmitter and receiver using arduino uno

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