Data streaming arduino with VisualfoxPro

[kenb4]

I can't understand how to transfer the Arduino sketch to Visualfox pro

That's not how it works. Each side runs its own code, entirely unaware of what is on the other side (other than something is supposed to be there). They communicate solely through serial-over-USB.

• sketch on Arduino
  • built-in serial with Serial
• form on VFP (the sample code below from that thread you linked)
  • a form component that wraps an object that can send information to the serial port

    PUBLIC oForm
    oForm = CREATEOBJECT("Form")
    oForm.ADDOBJECT("comm", "olecontrol", "MSCommLib.MSComm")
    
    WITH oForm.comm
    .CommPort = 1 && Set to your COM port number
    .Settings = "9600,N,8,1" && Match baud rate and settings
    .PortOpen = .T. && Open the port
    ENDWITH
    
    * Send "Hello World" to Arduino
    oForm.comm.Output = "Hello World" + CHR(13) + CHR(10)
    

    After assigning a few settings properties, data is sent by assigning to the Output property.

I should be able to transfer data from Arduino to Foxpro from a sensor. a data stream

In that case, the bits flow in the other direction. On the Arduino, you'd use Serial.print. In VFP, you apparently read the Input property, either by

• constantly polling it
• hooking an event that tells you when data arrives

I did not find any official documentation online, but there is a Word doc from the University of Iowa that (at least partially) explains this, and some old forum threads in various places. Relevant properties include

• OnComm
• RThreshold
• InputLen
• InBufferSize