one can build a simple "shield" with the buffer IC and plug it into the adapter board. To make the addition more compact and convenient, I moved all header pins to 0.1" grid, so the board can be used with a prototyping board.
The adapter board is pin-compatible with the Quadrature firmware, so it's possible to re-flash the board with it and add a simple 5V-to-3.3V buffer IC to plug in the glass scales.
#Arduino mini usb adapter pinout upgrade
Quite a few people who bought the original adapter board at a later time decided to upgrade to glass scales. The new revision doesn't have the B line anymore (it's pulled down inside the MCU), so probe and tachometer inputs are now simple 3-pin headers. While this was a well-intended feature, it turned out to be a source of confusion, since people with non-directional tachometer used the wrong line (B instead of A), etc. I designed TouchDRO firmware to support directional tachometer, which requires two sensor inputs for A and B signals. Note: I have come across a few USB power banks that fail to detect the load (due to TouchDRO adapter's low power draw) and shut off after a few minutes. Since the board draws relatively low current (on the order of 20mA), a moderately sized rechargeable USB power bank can power it for hundreds of hours. Finally, it opens up the possibility of powering TouchDRO from a USB power bank.
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