So its great once youve finished up a prototype on an official Arduino UNO and want to make the project smaller. Tried installing updated Silabs drivers: Walked through the entire Arduino Mac OSX guide: After looking into the system info of my Macbook Pro, I can see the USB Controller is Broadcom based, in case that helps. The Pro Trinket PCB measures only 1.5' x 0.7' x 0.2' (without headers) but packs the same capability as an Arduino UNO. The Arduino pin mappings can all be customized if the defaults are not convenient, and the motor driver control lines are broken out along the left side of the shield for general-purpose use without an Arduino.

Tried various cables, including the one that a I used before the Yosemite upgrade. Pro Trinket For Arduino Drivers Also Offer These great drivers also offer current-sense feedback and accept ultrasonic PWM frequencies for quieter operation. Tried connecting arduino to both USB ports. Version of the FTDI driver hoping that would clear it up: /Volumes/FTDIUSBSerialDriverv2218 I followed a tutorial of how to remove the existing Apple drivers and removed the kext files, etc. I connected my Arduino UNO R3 to my computer for the first time after the Yosemite upgrade - it worked fine before this! When I opened the Arduino IDE I selected Tools Board 'Arduino UNO', but when I try to choose a Serial Port the only options are: /dev/tty.Bluetooth-Incoming-Port /dev/cu.Bluetooth-Incoming-Port /dev/tty.Bluetooth-Modem /dev/cu.Bluetooth-Modem I have followed several tutorials and threads on how to 'fix' this issue, all to no avail: I've installed the latest version of the FTDI drivers (even though, from what I recall the UNO doesn't even need them): FTDIUSBSerialDriverv23.dmg Downgraded to a prev. I have a MacBook Pro running OS X Yosemite (10.10.3). This document explains how to install the Arduino Software (IDE) on macOS machines.

Pro trinket driver for arduino mac