Added an extra pair of pins for I2C and a reset switch. The reset switch in the Arduino is under the shield and inaccesible if you install a shield. Reset is used to restart the program. I used a PCB drill bit and a handheld Dremel to make the extra holes.
NOTE: I've had to make some changes to the pull-up resistors for the I2C lines from the 5V connection to the 3.3V connection because the OPUS is a 3.3V device. See this post.
NOTE: I've had to make some changes to the pull-up resistors for the I2C lines from the 5V connection to the 3.3V connection because the OPUS is a 3.3V device. See this post.
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