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Adding GPIO Header To MTR-1

1. Unplug your MTR-1 from power and remove the stand if attached.

Back of the MTR-1 with the stand still attached beside the USB-C port

2. Remove the backplate of the MTR-1.

MTR-1 with the backplate removed, exposing the green PCB and mezzanine connector

3. Identify the "X" on the PCB on the back of your MTR-1 and the "X" on the top left corner of the GPIO Header addon.

Tool pointing to the X marking beside the mezzanine connector on the MTR-1 PCB

Tool pointing to the X marking in the top left corner of the GPIO Header addon

4. Keep the "X" aligned on both sides and gently push down until it securely seats in the small mezzanine connector.

Fingers pressing the GPIO Header addon into place on the back of the MTR-1

5. Align the new back for your MTR-1 that came with the GPIO Header addon. Push down on the corners closest to the GPIO Header addon first, and then push the back on securely on the other two corners.

GPIO Header addon seated on the MTR-1 PCB, with the new backplate ready to fit

6. The case should sit flush and you're now ready to add functionality to your device!

Assembled MTR-1 with the new backplate sitting flush around the GPIO Header addon

GPIO Header addon pinout diagram labeling the GND, 5V, 3V, SDA, SCL, and IO pins

!!! ! tip "Make sure to check out our GPIO Header LED Strip Tutorial!"

Brandon AKA SmartHomeSellout made this neat tutorial for how to connect a short LED strip to your MSR-2

<a href="https://wiki.apolloautomation.com/products/msr2/examples/gpio-header-control-an-led-strip/" target="_blank" rel="noreferrer nofollow noopener">GPIO LED Strip Tutorial</a><br>