Monthly Archives: September 2014

How to get OS X 10.9 Mavericks and Arduino IDE to play nicely with each other

Apple tried to be smart with OS X Mavericks, developing their own FTDI drivers. Just too bad they don’t seem to work.

I have been getting nothing but “avrdude: stk500_recv(): programmer is not responding” errors when trying to upload sketches to various Arduino compatible boards.
In the end, the only thing that worked was programming the boards using a dedicated programmer (in my case an USBasp).

Some digging around forums and Apple’s support site, the following steps has solved the issue on all the OS X machines where I have tried it. In short, you need to replace Apple’s drivers with the ones from FTDI.

  1. Open a terminal
  2. cd /System/Library/Extensions/IOUSBFamily.kext/Contents/PlugIns
  3. sudo mv AppleUSBFTDI.kext AppleUSBFTDI.disabled
  4. sudo touch /System/Library/Extensions
  5. Restart computer
  6. Install FTDI’s virtual COM port drivers from In version 2.2.18 this package contains two executable files, I have had success with the one named FTDIUSBSerialDriver_10_4_10_5_10_6_10_7
  7. Restart again (might not be needed, good practise though after installing drivers)

Voila – The Arduino IDE can now upload sketches to all boards I have tried, both with the old/legacy bootloader and Optiboot.

Raspberry Pi won’t boot – only red power light comes on – SD card corrupt? Not so fast…

After having problems with SD cards failing after a few months in a Raspi that was supposed to be always-on, it was time to look for options.

The IPE distribution seemed like a perfect match – it effectively makes the Raspi only use a ramdisk, except possibly during boot. When needed the SD card file system can be made writeable, meaning that apt-get etc can be used as usual to install apps.

This worked great for ca 3 weeks, then this setup ALSO failed, with the same symptoms as before: at boot only the red power light would come on – nothing else. A fresh SD card with a fresh copy of IPE worked fine in the same Raspi hardware, thus not the Raspi itself that had fried (the cabinet where it lives is kind of warm, nothing too crazy though).

Now the weirdness starts for real. The failing SD card works perfectly fine when inserted in both an iMac and a Windows laptop. I spent hours and hours reformatting the card with various low-level tools, then writing the standard Raspian image to the card. Just for reference I did the same to a third SD card too, that card was identical to the failing one.

Still the same issue: that one card would still prevent the Raspi from booting.

The card in question is a Kingston 16 GB microSDHC card marked SDC4/16GB 081. It comes with an adapter that makes it usable also in large SD card connectors.

Photo on 11-09-14 at 06.52 #2

Finally, and I of course should have thought of this sooner, I tried swapping the two different microSD to SD adaptors. And of course… the solution was simple. It was not the SD card that had failed, it was the adapter. For some reason (heat? just poor quality?) the adapter had a small crack in its plastic housing, and as a result most likely some poor connection inside, between the microSD card itself and the surrounding adapter. When inserted into a proper computer, there was probably enough pressure on the adapter to squeeze it against the actual microSD card, while the SD card holder on the Raspi is kind of flimsy, and did not provide the needed pressure. When using a working adapter all three microSD cards work flawlessly in the Raspi.

Note to self: Use full sized SD cards in Rasperry Pis….