There are not really that many changes from rev3 to rev4 of the JeeNode Zero. The main one was to extend the main header by one more pin, and to move the radio module to other pins so that all of PA0..PA7 are now free to use - these have the most fexibility for general use (up to eight 1 Msps 12-bit ADC’s!), and also bring out the DAC (D-to-A converter), which is on PA4.
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