C# Serial Port Communication Arduino: If you have problems on Serial communication with Arduino in C#, this post is perfect for you!!!These days, I'm learning serial port communication and want to write a simple demo on my LattePanda. LattePanda is a Win10 single board computer, it in. Click the serial monitor button in the toolbar and select the same baud rate used in the call to begin. Serial communication on pins TX/RX uses TTL logic levels (5V or 3.3V depending on the board). Don’t connect these pins directly to an RS232 serial port; they operate at +/- 12V and can damage your Arduino board.

I am working on a project and it is almost done except for a few things including increasing the baud rate. I use a verification where the Computer will say 'Hello?' And if the arduino receives 'Hello?' It will respond back 'Hello!' Which will then be verified by the computer.

This works all fine until I increase the baud rate above 9600. I am changing the baud rate on both ends and I have tried for hours to mess with the timing and such, but nothing works.

The odd thing is if I increase the baud rate on the arduino and then use the arduin IDE serial monitor and send 'Hello?' At the same baud rate, it works. Therefor it is more than likely that the error is on the computer end.I've attached the code the main thing to look at is the arduino Matrix Display 3.0 and the SerialClass and main.cpp. I've included all the code in case anyone wants to look at it.Any help will be greatly appreciated. Try adding a short delay between characters sent by the Arduino. Even though the baud rate is fine, delays in processing the characters on the computer end can cause problems.

Some versions of Hyperterminal are particularly bad in this regard. Sometimes you can get a little pacing by sending 2 stop bits instead of 1.You can test it by with a wrap plug - jumper pins 2 and 3 on a DB9, stick it in the computer's port and send a text file to the serial port. If the computer is bogging down, you should be able to see it missing characters. Note that if you have flow control enabled you'll also need to jumper the handshaking lines.You also could do a wrap plug on the Arduino side. Send long strings and compare what comes back.If both ends work, it may be the cable/MAX232 etc. Some cheapo USB-RS232 adapters perform poorly under even reasonable comms loads plus there are counterfeit ones out there.Good luck. Kotor 2 best planet order. I've tried adding a delay in multiple place to no avail.

I'm using USB not DB9. I've narrowed it down a little bit more. I set up so that if the arduino does not recieve the 'Hello?' From the computer it sends back what it did receive.When I try 14400 baud it sends back ' He' or ' He'When I try 115200 baud it send back '≡≡He'When I send 'Hello?'

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The serial port I receive the correct response back.So it is either seems to be in the computer sending the 'Hello?' OrThe computer receiving the 'Hello!' Theres a part of my code that basically says if the number of characters in the serial buffer is less than the number that has been told to read, then read only the amount that is in the serial buffer. When I test it this if statement is always true with saying there are either 3 or 4 bytes to read in the buffer. You need to do this in steps, first set up the arduino such that it lights a led for a short time when the correct data is received.

It may be that the arduino receive function is too slow for this to work at high speeds or short intervals between characters - this is the problem with using arduino instead of plain old C, you have hard time finding how it really works under the hood.Second, try sending the string from the arduino to Pc in a loop with a bit of delay between the strings and see what you get on the pc. You need to do this in steps, first set up the arduino such that it lights a led for a short time when the correct data is received. It may be that the arduino receive function is too slow for this to work at high speeds or short intervals between characters - this is the problem with using arduino instead of plain old C, you have hard time finding how it really works under the hood.Second, try sending the string from the arduino to Pc in a loop with a bit of delay between the strings and see what you get on the pc. I have done it in steps, very small steps indeed. Everything worked, and then I said 'ok I'm going to increase the baud rate and make it faster.'

One step at a time. I went from 9600 to 14400.

And things didn't work so I messed with the timing did a lot of troubleshooting and determined one thing. It works perfectly when the C computer end initiates the connection before the arduino starts its connection.So what I am wondering if there is a way to pause/hang the arduino until the Computer connects to it. I have tried stuff like while(!Serial) and while(serial.available), but neither has worked.