Sign up using Email and Password. The result of all this is that a modified HC-SR04 can measure tiny distances. Mail will not be published required. You can follow any responses to this entry through the RSS 2. I’m not sure what MAX’s he’s talking about but in my experience the output drive voltages are closer to 7 V rather than his quoted 10 V. Read any reference on 2nd order systems for an explanation of Q and resonance. This change is claimed to allow operation down to 3.

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There has to be something to make the line wiggle – my guess is that having removed the utrasonic signal through the air, there remains some electronic crosstalk between receiver and transmitter. To get to hundreds of amps, your output voltage is at a few millivolt as there is only so much current you can draw from an AA cell in the first place without its voltage sagging.

I have not been able to locate any examples. Ultrasonic Rangefinder, Part II: I connected the receiver element to my scope to detect the signal, and was surprised to detect nothing. Or maybe 8 us as per your title?

The speed of sound in air is nearly constant ignoring slight variations due to air pressure and humidityso the time from ping to echo translates directly into the distance to the object. It is possible to fit distance to be a function mxa232 time and phase.


The other two chips have no markings.

Good Vibrations: Giving the HC-SR04 a Brain Transplant

The threshold signal goes to the inverting input on the op-amp used as ulrrasonic of a comparator and the final amplifier output to the non-inverting input. I could find no such voltages.

The PIC has ultrasonlc internal 4x increase in oscillator speed, so the 2Mhz timer oscillator leads to the 10Mhz clocking. Someone has reverse-engineered at least one model of the board: In the first the red signal is the trigger input, and yellow the echo output. First picture circuit diagram; second simulated input and output green signals; third real result.

Anyone interested to help me or guide me to the right stuff that does what I want? The microprocessor then sends the 8 cycles of drive to the sender 14 V p-p through Ohm resistor, so there is no waiting for an osc to reach amplitude.

Good Vibrations: Giving the HC-SR04 a Brain Transplant | Hackaday

The first order of business was confirming that operating frequency. According to a comment on the All Electronics page for the transducers I orderedthey run at 24kHz. Leave a Reply Click here to cancel reply. When I pointed the ulrasonic at the receiver, a signal showed up on the scope; when I pointed it away, the signal abated.


JackCreasey Jack, I don’t think you understood my point at all. I’ve not had one with a chip actually marked MAX, and they ,ax232 be simpler driver buffer chips see the ” postscript “.

The result is that decreasing the distance by a small amount can end up with the value returned by the HC-SR04 increasing this is the lack of monotonicity. March 8, at Read times previous topic – next topic.

I will not respond to Arduino help PM’s from random forum users; if you have such a question, start a new topic thread. Notify me of followup comments via e-mail. It is a waterproof type and has too high a Q for good results in a ranging application. Goofballtech on Sep 09, Edit History Recent Changes all Search.

DIY Ultrasonic Rangefinder Ultrasonic rangefinders detect objects and measure distance the same way as a bat: I would agree with your comments more if the question was about the Rx channel, but it was about the Tx channel.

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