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My project is to build an example of PID controls, some thing like the Simple_PID_Demo.vi in LV library. I've look at the Block Diagram but not sure to understand it. I need help to build an example of only "P" control, then i can move to "I" and "D". I've tried but it not work , anyhelp is appreciate. Thank you

I've used the OC inverter 7406 IC to and then the input work. I think the reason for using it is about the pull up resistors. thank you for helping me!

I have read the instruction from NI about using Status Lines and Control Lines to import data from parallel port but there's some point that i does not understand. http://zone.ni.com/devzone/conceptd.nsf/we...6256B1800794596 As U can see in the picture below. 4 upper bit of the Status Register was map to be the D7 to D4 and 4 Lower Bit of the Control Reg -> D3 to D0. But i don't know why there are somekind of "Not Gate"? in the latter 4 Lines. I have try it directly and only the Status's 4 Bits response. So i think that these "Not gate" is must_be. Can anyone helping me about this, what is that icon and what is "O.C", what kind of IC must i use to do it.

Yes, u win your bet :thumbup: . I've tried to configure the serial transfering speed and it worked. Thank U very much. And now about the handshaking . I would like to do a software handshaking so i send a command character to uC and the uC send a byte of data back. It works with no framming error. But, the annoying thing is i have to stop the VI then run it again each time i want to send the command character. I had thought about putting the writting blocks into a case or a while structure but it did not work when i push the boolen button. I need a button that send a character each time i press it, how can i do it. Thans for help me one more time.

Thank you, i think the problem is about the parrallel thing u said. In the basic_read_and_write.vi example, they perform the write first and then the read and it work smoothly . and, thank u for the other thing like carriage return, i am confusing about it. :thumbup:

I am trying to send some streaming data from my Microcontroller to LabVIEW (through Serial port) and draw a waveform graph. In this case a send a string from A-Z and so on. It works (even though i have to make sure the LV run first and then the uC, this is to avoid wrong frame reading) . But a strange thing happen when i disconnect the uC. The VI still reading (from A to Z as normal). I try to stop and run it again but it still reading (and so does the graph). I close the VI and open it again, oh no, still running like hell . The whole thing only stop only after i open Hyperterminal or Basic_read_and_write.vi and read something. By the way, this problem does not occur on Hyperteminal or other reading application. What was happen with my program? As you can see below, i tried to use whileloop to do this, is this the right structure?. And how can i get rid of the wrong frame reading problem. I am thinking of sending some command from LV to uC to have it start sending data. How can i do it. Thank you alot for any helping. :headbang: Download File:post-4445-1145237515.vi

Oh, I see. Thank alot, i will try it when back to home.

The "typecast" has 3 "pin", 1 for input, 1 for output, and the last one for the type that the data trasform into, that's what i've learn from LV Help. But what kind of controls should i connect with the "type" pin? I've seen in the "serial61.vi" that the programmer does not connect any thing to the "type" pin (he use it to convert a number to string) . Another question, so what can i do if i need to do it reversely : convert a string read from serial port to a number. Thans for helping me and excuse my bad English.

:headbang: I have some problem down here, thanx in advance for help - I 've write a example like below to read back the value sent to Com port , but the program does not run as i thought. I have to click the RUN button several time to get something in the indicator and it's wrong most of the time. Can anyone help me figure out the reason? - I am trying to communicate my 8952 uController with Labview. write something to uC is working but reading is not. I have my uC sending continuously a character and then reading it in Labview with the VI downloaded in NI webpage (the Serial.vi). The problem is it always read the wrong value. I think that it is the problem of not recognize the right "frame". So how can i solve it ? - Another thing, i want to use VISA READ to read continuosly from Com port then display the value to an indicator . So what kind of structure should i use ? Thanks again. Excuse my bad English

Hi everyone, I'm new here. I'm on a project with LabView and i need to make "some thing" to desmonstrate the features of the program. I've tried to trigger some LEDs through LPT port and now i need to make somekind of DAQ device. i've just think of making a thermometer with LabVIEW (from scratch) and wondering if it's complex or not. Can u help me firgure out the way to do it or another idea about a simple DAQ device? Thank U in advance and sorry if my English is not good.