Learn how to interface arduino through serial communication with python using the pyduino library. There are few other tutorials out there on instructables on how to. The Delphi application I wrote to test the PC-to-Arduino communication is very simple. Six checkboxes are used to turn an Arduino digital pin HIGH or LOW.
Active4 years, 4 months ago
I want to read a string from my Arduino via Usb(Serial).I made this script but it has a problem:
https://printyellow.weebly.com/hashtab-60.html. The problem is that the 'count' isn't right.For example, when i send 'Backspace' this is the output:
But on the arduino serial monitor it works fine.Does anyone know why the the 'count' isn't right and how to fix it?
RRUZ
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jwz104jwz104
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2 Answers
As Remy said, when receiving data in serial communication you may have many events triggerin for the same string. In fact each byte is an event, but drivers usually buffer the data.
To know the end of your message you should add some char sequence at the end of this message. If you send the string from Arduino using
Serial.println() instead of Serial.print() , then it will add a new line mark after the text. This way you just need to add the characters to the ListBox1.Items.Text property instead of using Add function. You need to allow the chars #10 and #13 to make this work.
Also, if you do it this way, you don't need to send the bell character (#7).
mclopezmclopez
You are assuming a 1-to-1 relationship between the complete data and the event. There is no such guarantee. It may take multiple events to receive the complete Digitech rp500 patch list. data. The event is simply reporting that there is some data available at that moment. In your example, you likely received an event for 3 characters, and then received a second event for the remaining 6 characters. You called
Add() twice, once for each portion of data, rather than once for the complete data.
As such, you have to analyze the data you are receiving, caching it as needed between events, and then call Remy LebeauRemy Lebeau
Add() only when you have complete data to display. For example:
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Active5 years, 11 months ago
I am developing Delphi application on Delphi 2010 XE RAD Studio under Windows 7. My application talks on the serial port non-stop. I am using AsyncPro for Delphi 2010. Serial communication and everything else on the computer I develop with works great without any problem. How to install antares autotune in studio one 3 mac. However, when my release version of my application is run on another Windows 7 system, serial communication completely fails. We probed the serial communication itself for an answer and found out that Request to Send (RTS) line is not dropped right after sending all the bytes, whereas on my development computer RTS line is dropped correctly.
Even when I explicitly drop the RTS line to low or false state, RTS line doesn't drop right away but after good 15 milliseconds. Thus, serial communication on my release version is failing.
Am I missing important information about Windows 7 and serial communication issues?
UPDATE: I just found the bug with my Aysncpro 5.0 for Delphi XE. It is weird. When my Delphi XE IDE is open or running, my program is communicating flawlessly. When I shutdown or close my Delphi XE IDE while my program is running, the same program doesn't communicate very well or it times out. Guitar pro version 5 free download.
Chime in if you have any idea why it is happening.
Any help will be appreciated. Amazon download movies purchased to mac.
Thank you,
dsolimano
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3 AnswersArduino Serial Communication Example
Sounds like a timer resolution problem to me. I had the same problem trying to write to a USB FTDI driver using an event based timer with
timeSetEvent() . When Delphi loads, it changes the timer resolution to less than 20ms, which made my app work fine. When the IDE wasn't running I couldn't get things to work below 20ms +/- 5ms (the default Windows resolution I believe).
To fix the problem, I call
timeBeginPeriod(1) in the thread to set the minimum system wide timer resolution.
I believe this affects the resolution of other time based events, because I get better than +/-5ms accuracy on other (non-multimedia timer) wait events in my app when I use
timeBeginPeriod() .
So, what I'm suggesting is that somewhere in the AsyncPro code it's using some time based event or call back. That would be affected by Delphi's change to the timer resolution when it is loaded. Try calling
timeBeginPeriod(1) somewhere in your app when it starts and see if there is a change.
Oh, and don't forget to call
timeEndPeriod(1) when your app shuts down.
N@
NatNat
Windows 7 home keygen. Last few times I saw random inexplicable crap like I tried everything, and was unable to solve it for months.
I found two different common causes:
Arduino To Arduino Serial Communication
The Debug build not having the problem could be two things:
The easiest thing to do is to try it with a different USB to serial adapter, and if that doesn't solve your problem, I would be tempted to pull out AsyncPro which I have also had many random problems with, and either write your own serial port class, or use TComPort. I have some long experience using a TThread that uses a com port 'reader/writer' class and have found this the most reliable way to go, because you can tweak low level elements of the Win32 overlapped-IO calls, directly to meet your needs, and also be sure that you don't have some extra complexity/overhead getting in your way. (AsyncPro's complexity and overhead, are a significant potential source of bugs.)
Arduino Mega Serial CommunicationWarren PWarren P
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What Is Serial Communication
This has to be a driver problem on the other machine, surely? Hardware flow control works fine on my W7 test box as well, (and Vista development machine). If your Apro has set the DCB correctly, and it sounds like it does because of your 'manual' tests, the driver should work.
15ms for a 'manual' RTS change from user mode is sad, but not at all unusual on Windows - that's why the driver should do it.
Rgds,Martin
Martin James
Serial Communication PptMartin JamesArduino Multiple Serial Communication
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