Elastic Sheep

Because elasticdog was already taken

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Entries from January 14th, 2010

Reading an SD card part 2: Teensy 2.0

January 14th, 2010 · 8 Comments · Uncategorized

I was eager to try the ATMEGA32U4 so I ordered a Teensy2. In this post I will adapt the sd-reader library previously tested with an ATMEGA168 to the Teensy2. Converting the Teensy2 to 3.3V The Teensy2 can be powered by a 3.3V regulator. The conversion is described here. The regulator is soldered underneath the board. [...]

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Reading an SD card with an ATMEGA168

January 12th, 2010 · 35 Comments · Uncategorized

In this small week-end project, I will connect a SD card to an ATMEGA168 and try to read data from it. The SD card pin-out The SD card can be talked to with three different transfer modes: 1-bit SD mode, 4-bit SD mode and SPI mode. According to Wikipedia, all cards must support all three [...]

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Installing the LUFA TeensyHID bootloader

January 5th, 2010 · 48 Comments · Uncategorized

The LUFA project contains the TeensyHID bootloader that can be used as a replacement of the original HalfKay bootloader preloaded on the Teensy boards. It can be useful if like me you have completely erased the original flash with an external programmer. Because the HalfKay bootloader is proprietary code and is protected by lock bits, [...]

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