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Can't connect to Serial Device using Mathematica 10 under Windows 7

Diego Zviovich
Posted 10 years ago

Following instructions as listed in the documentation Serial (RS-232 / RS-422 serial protocol I'm unable to successfully connect to the device (Arduino Uno) using 

DeviceOpen["Serial",{"COM10","BaudRate"->9600}]
(*SerialLink`SerialPortOpen::nopen: Could not open the port COM10.*)

Port COM10 is alive, well and tested in the computer, using another program to link the device, send byte codes and receive values back. enter image description here
POSTED BY: Diego Zviovich
9 Replies
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Diego... My apologies for bringing an out of subject issue. I have been going back and forth between Arduino and Mathematica Devices forums. At some point the line got blurred. Thank you for the links.
POSTED BY: Jose Calderon
Diego Zviovich
Diego Zviovich
Posted 10 years ago

Hola Jose, Serial.println and Serial.write are Arduino functions and not from mathematica.

For Serial.println > http://arduino.cc/en/Serial/Println

For Serial.write > http://arduino.cc/en/Serial/Write

POSTED BY: Diego Zviovich

@Fahim Chandurwala This is ver interesting.. I just puzzled.. How did you figure this out?

Another thing,, I an confuse as to when to use Serial.println[] and when to use Serial.write[]? Can anyone comment here?
POSTED BY: Jose Calderon
Diego Zviovich
Diego Zviovich
Posted 10 years ago
POSTED BY: Diego Zviovich

Diego, there will be a fix in Mathematica 10.0.1 to make "COMn" work for n>9. Thank you for reporting this.
POSTED BY: Arnoud Buzing

@Diego Try "\\.\COM10" instead of "COM10" as a workaround. 

DeviceOpen["Serial", {"\\.\COM10", "BaudRate" -> 9600}]
POSTED BY: Fahim Chandurwala

Diego,

I am seeing the same issue: DeviceRead[serial] blocks and DeviceReadBuffer[serial] returns always {}

I'm using the following arduino sketch:

void setup() { Serial.begin(9600); }

void loop() { Serial.write(42); delay(1000); }

In a serial monitor this prints out asterisks (*) which is character code 42.

We looking into it and will update you when we have a solution.
POSTED BY: Arnoud Buzing
Diego Zviovich
Diego Zviovich
Posted 10 years ago

Hola Jose,

Indeed I closed the Serial Monitor and Putty. Only one program can communicate with the arduino at a time. The reason Im showing it on the screen is that indeed the COM10 port works with all tools except mathematica.

Here is the sketch

#include <dht11.h>
dht11 DHT11;
#define DHT11PIN 2
int inByte = 0;         // incoming serial byte
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);

}

void loop() {
  // put your main code here, to run repeatedly:
 if (Serial.available() > 0) {
    // get incoming byte:
    inByte = Serial.read();
    if (inByte == 84){
      int chk = DHT11.read(DHT11PIN);
      Serial.println((float)DHT11.temperature, DEC);
    }
    if (inByte == 72){
      int chk = DHT11.read(DHT11PIN);
      Serial.println((float)DHT11.humidity, DEC);
    }

 }


}
POSTED BY: Diego Zviovich
POSTED BY: Jose Calderon
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