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Showing results for tags 'digital i/o'.
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Afternoon, all I have a question about the digital I/O interface between the Analog Discovery 2 oscilloscope and the Impedance Analyzer board. I am attempting to emulate the Waveform software impedance measurement screen for the purposes of First, I was able to use the LabVIEW drivers provided by the manufacturer to generate 3.3 volts for as an output measured between the pin and ground. Per the schematic provided for the Impedance analyzer board, the digital I/O pins are used to channel through the various resistors utilized to measure whatever load is applied between the oscilloscope pins. However, when I use the Waveform software and select Adaptor board in the Impedance screen, I am unable to measure any change in the digital I/O which are used to switch the resistor values 1M, 100K, 10k, 1k, 100 and 10 ohms. I used the same meter I used to verify that I was getting a voltage output between the digital I/O pins and checked measured between the pin and ground, but was unable to read anything. I also used an oscilloscope to see if I was missing a momentary pulse that I wasn't seeing on Also, there is nothing wrong with the board or the oscilloscope since I can hear the switches clicking on my Impedance Analyzer board when I select different resistor values and also measure the values between the Oscilloscope 2 and ground. It is just that I can't measure the digital I/O voltage when I am actually using them Therefore, my question is in regard to verifying the digital I/O being applied to the Impedance Analyzer board and whether or not I am measuring across the pins (the output pin and ground) or if there is some other verification process in order per the waveform software which I am not privy to in the selection process. Please advise at your earliest convenience. I am uploading the diagrams I am utilizing for my testing. Let me know if you have any follow up question in regards to my query. Thanks as always, Forrest Palmer analog_discovery_impedance_analyzer_sch (1).pdf
Dear Digilent Support Staff,I'm a graduate student at the University of Arizona, and for my Master's Project, I'm designing an irrigation process control system. I'm using a Digilent UC32 microcontroller to read whether or not a switch from a relay contact from a flow meter is either open or closed. I will be using a 5 V power supply, and have read that the digital input pins on the Digilent UC32 can handle 5V at logic levels. I have a few questions: What is the maximum current that is safe for the UC32's digital pins to handle? Do the digital pins have a built-in resistor that will limit the current draw, or do I need to use a voltage divider for this? What is the minimum current that the UC32's digital pins can take accurate HIGH/LOW input readings at, from a 5V power source? Best Regards, Nick