Darron took his Amazon Kindle DX and decided to throw in Bluetooth connectivity by sticking in a Sparkfun Bluetooth Mate so that his ebook reader will be equipped with a wireless serial terminal. There are three big pads located in the middle of the Kindle PCB labelled GND, RX and TX, so it doesn’t take a rocket scientist to figure out which connection goes where, although managing the voltage proved to be much more of a challenge but Darron managed to find 4V coming off of one side of the Kindle’s wakeup switch. In order to protect the Bluetooth module, he decided to modify it to pull-up the TX from the on-board regulated 3.3V instead of the 4V coming in from the Kindle.
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