hongthiet1994 Posted May 28, 2019 Share Posted May 28, 2019 I had DMM Shield: 7-Function Digital Multimeter Shield Link product: https://store.digilentinc.com/dmm-shield-7-function-digital-multimeter-shield/#write_review I had code for Board DMM Shield,now, it can measure voltage, current, ohm,.... but only RMS Now, i want to display waveform of signal I do not know Hy3131 which can read ADC to have wayform? any suggest for me? Link to comment Share on other sites More sharing options...
JColvin Posted May 28, 2019 Share Posted May 28, 2019 Hi @hongthiet1994, My understanding is that the code for the DMM Shield does not currently support the reading and displaying of waveforms (because the DMM shield doesn't have a display). As shield is reading inputs from an external source, it is possible minimize the reading delay and set up some extra code to display these points on a separate screen. None of us here at Digilent have attempted this though. Thanks, JColvin Link to comment Share on other sites More sharing options...
hongthiet1994 Posted May 29, 2019 Author Share Posted May 29, 2019 i can use hardware SPI to communication with H3131 which had high speed But, i worry adc speed'Hy3131 not enough to read signal 1Khz Link to comment Share on other sites More sharing options...
JColvin Posted June 3, 2019 Share Posted June 3, 2019 Hi @hongthiet1994, I think you are correct in that the HY3131 will not be able to read a 1 kHz signal, based on the datasheet of the HY3131 only claiming an output rate of 5 Hz (though it isn't the most clear on this point). I believe the important thing to remember with this module is that it is acting as a digital multi-meter, not an oscilloscope (which can operate at high speed). Does that answer your question, or did I misinterpret what you were asking? Thank you, JColvin Link to comment Share on other sites More sharing options...
Cristian.Fatu Posted July 9, 2019 Share Posted July 9, 2019 I agree with James, there are poor chances to implement a proper oscilloscope with this DMM device due to its poor acquisition rate. To check this, you could modify the provided demo and remove the delays from the main loop, so you can see data acquired at maximum rate. Link to comment Share on other sites More sharing options...
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hongthiet1994
I had DMM Shield: 7-Function Digital Multimeter Shield
Link product: https://store.digilentinc.com/dmm-shield-7-function-digital-multimeter-shield/#write_review
I had code for Board DMM Shield,now, it can measure voltage, current, ohm,.... but only RMS
Now, i want to display waveform of signal
I do not know Hy3131 which can read ADC to have wayform?
any suggest for me?
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