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Gizmo2 – Adding external PWR and RST buttons

In my previous post, I designed and 3D printed an enclosure for the Gizmo2. Unfortunately, this blocks access to the onboard power and reset buttons. So I searched for a way to have some external buttons which I could eventually mount to the enclosure.

Buttons

The process to find where I could connect my buttons to was rather simple actually. Using my multimeter, I searched for connections between the buttons and the JTAG debug port. I quickly found following mapping:

photo (3) DSCN3195
Using jumper wires, I made the connections with buttons on a breadboard and tested the setup. Both buttons work as expected.

UPDATE: the two colored pins on the top row are actually connected, so they could be replaced by a single, common connection.

Demo

Here’s a short video demonstrating the buttons functioning as expected:

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© Frederick Vandenbosch, 2014-2018. Unauthorised use and/or duplication of this material without express and written permission from this blog’s author and owner is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to Frederick Vandenbosch with appropriate and specific direction to the original content.