Unity3d serial port communication

Also, if you are getting Quaternion values, do not loose time to convert them to Euler Angles. If you reduce baud rate, your data from IMU can be corrupted. I mean, you can downsample your data. As you know, Unity does not allow us to use data received event but you can create your own event to understand if all of your data has been received.

Also try discardInBuffer if you have problem with streaming. If you are using Windows, you can start searching with kernel Since serial data has it's own speed and must not be depended on the game update frequency otherwise it causes the serial stream to buffer and huge lagging accures , the following solution worked for me:. In the initialization function init I call invokeRepeating - timer that repeats itself every 0. This way, when there is a problem inside serial port, game won't lag because the thread takes the pressure on itself.

InvokeRepeating will make sure the threading reading data is attempted to be called every fixed desirable amount of time and therefore serial data will not buffer. Worked just fine for me. Serial data speed was about 16Hz and gameplay framerate was - fps. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 6 years, 8 months ago. Active 6 years, 6 months ago. Viewed 2k times.

In this case, we will replace Serial. Now let's test it by opening up the Serial Monitor again and typing 1 in the input field and pressing the Send button. This time we will get 1 in the output window. If we type and send it, we will get back in the output window. Don't forget that if you have any Serial. I made this mistake once which caused me a lot of headaches as I was trying to figure out what all that extra data was that was coming out of my serial data stream!

Now that our Arduino board is setup to receive and send serial data, let's use Unity to send and receive data with instead of the Serial Monitor. Create a new empty project in Unity.

Let's create a script that will get a list of COM ports that we can connect to for our serial connection.

In this example, I've called the script "SerialTest", but you can call it whatever you want. Here we are going to use a dropdown from Unity's UI that the user can select from to get a list of COM ports that are available to connect over.

We put this in a separate method called RefreshPortsDropdown so that we can call it from a "refresh" button if we wanted to. Net 4 in order to use the SerialPort class, otherwise you may get errors in your project.

Note that we are setting the DtrEnable property of our SerialPort instance to true. Without this you may not be able to read a response back from your Arduino board. Now that we have a way to connect, it is important to also have a way to disconnect our serial connection.

Otherwise the connection will remain open! Notice that we are calling Disconnect in OnDestroy. This is to make sure we close the connection we opened if the script is destroyed or if the app is closed down. In this case we are writing out a byte buffer of size 1 and setting the binary value 1 in it. You could write out more data if you wanted, but here we only need to pass 1 byte to illustrate our point.

To read our response from the Arduino board, we need to check our serial connection if data is available to read. We can do this by first making sure our connection is open and then checking to see how many bytes are available to read. If we have some data to read, we create a buffer of the appropriate size to read into and then print the results to the Unity console if we got anything. Now when we send data to our Arduino board using the Ping method we wrote earlier the Arduino board will read it and then reply back with what we sent it.

In this case, a 1. To use the SerialTest script we wrote above, attach it to a component in your scene and create a Canvas that has a Dropdown, Button "Connect" button for connecting to the selected port, Button "Ping" button for calling our Ping method, and a Text component for showing the status of our connection. Joined: Apr 13, Posts: Hi everyone, I spent the last 3 days on trying to receive data from an automated relay.

I tried every snippet of code I found online and whatever I try, I have a timeoutException. The relay works fine when I use his bundled software. I tried to sniff the hex bytes going through the cable to make sure the request made from UNITY and the software were the same but nothing works.

I copy pasted my small test class here. If anyone has the experience of serialPort Communication and see something wrong that can lead to my TimeoutException, I'll gladly accept the help!

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