Python Serial Usb Example For Mac Os X

Where is google drive on my pc. On windows, install python, win32 extensions and pyserial (if you want to. On Mac OS X (10.5 or later). Also type ls /dev/tty.usbmodem* to find the device name of the mbed USB serial connection. This is an example using HTTP.

I used to have great success on mac (about a year ago on an older version of OSX and arduino IDE), but recently I can't seem to upload to Arduino consistently. Nine out of ten times I get the errors below and one out of ten I get a successful upload. I'm running OSX 10.10.4 on a mac book air Arduino 1.6.5 Trying to upload to: Uno R3, Mega2560, bare conductive board. I have multiple of each and have reproduced the problem on all of them. Also, I'm able to upload successfully from another Ubuntu machine that I have, so I think the hardware is ok. It's unclear what is the culprit.

I've read that the mac ftdi drivers have changed, but the new Arduino boards have ditched the FTDI chip for an onboard usb-serial-converter. I also noticed that the /dev/tty.usbmodem* has disappeared from the port options under tools, so I have to use /dev/cu.usbmodem*. Oddly, if I ls /dev from the command line both cu.usbmodem and tty.usbmodem exist. I frequently get one of the errors below and the boards fail to program, occasionally I get no error and the board fails to program silently. Restarting the Arduino IDE will normally allow me to upload the first time and then will give me errors on subsequent uploads, ~10% successful.

I get similar errors trying to open the serial port and need to try about 6-10 times before connecting. Is anyone else seeing this? Any suggestions on troubleshooting this issue? Errors: 1) Error opening serial port '/dev/cu.usbmodem1421'. (Port busy) 2) avrdude: ser_open(): can't open device '/dev/cu.usbmodem1421': Resource busy avrdude: ser_send(): write error: Bad file descriptor Problem uploading to board. See for suggestions.

3) processing.app.debug.RunnerException at cc.arduino.packages.uploaders.SerialUploader.uploadUsingPreferences(SerialUploader.java:131) at processing.app.debug.Compiler.upload(Compiler.java:165) at processing.app.Sketch.upload(Sketch.java:1167) at processing.app.Sketch.exportApplet(Sketch.java:1141) at processing.app.Sketch.exportApplet(Sketch.java:1113) at processing.app.Editor$DefaultExportHandler.run(Editor.java:2380) at java.lang.Thread.run(Thread.java:745) Caused by: processing.app.SerialException: Error touching serial port '/dev/cu.usbmodem1421'. At processing.app.Serial.touchForCDCReset(Serial.java:92) at cc.arduino.packages.uploaders.SerialUploader.uploadUsingPreferences(SerialUploader.java:120). 6 more Caused by: jssc.SerialPortException: Port name - /dev/cu.usbmodem1421; Method name - openPort(); Exception type - Port busy. At jssc.SerialPort.openPort(SerialPort.java:164) at processing.app.Serial.touchForCDCReset(Serial.java:86). I have basically the same setup and have had the exact same problem for quite a long time now.