Confused about wiring

[cameroncooke]

In the assembly document it says the following:

If using the accelerometer you'll need to share a GND pin.

Yet in the photo, the only ground pin being shared is that of the SDLT switch's middle pole and the FireBeetle GND pin.

Also it says:

The I2C headers are directly opposite each other so if you've soldered on a female header the easiest option here is some solid core wire.

In the above image you can see my board and that reference image (top left). On the reference image the first female pin header on the FireBeetle is blank and second is labeled VCC, on my board the first pin header is VCC. Also looking at the reference image the wires don't go to the corriposnding labeled port on the other side.

For example, GND on Accelerometer appears to go to 3V3, SCL to GND, SDA to SCL, and the SDA port on the FireBeetle is empty.

The documentation clearly spells out which labels to to which apart from the accelerometer where the documentation is vague and image unclear.

If anyone can advise I would much appreciate it.

[opensourcefan]

My plan was to create a schematic to solve the ambiguity in the wiring once I got it all working. No luck yet though. Hopefully someone else can do it.

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On Fri, Feb 21, 2025, 09:45 Cameron Cooke ***@***.***> wrote: In the assembly document it says the following: If using the accelerometer you'll need to share a GND pin. Yet in the photo, the only ground pin being shared is that of the SDLT switch's middle pole and the FireBeetle GRD pin. top-view.jpg (view on web) <https://github.com/user-attachments/assets/2b92021c-2ee2-4743-b0a5-a3550971501f> Also it says: The I2C headers are directly opposite each other so if you've soldered on a female header the easiest option here is some solid core wire. IMG_1362.2.jpg (view on web) <https://github.com/user-attachments/assets/58801329-5943-4c8d-9061-ed7b4631a2ae> In the above image you can see my board and that reference image (top left). On the reference image the first female pin header on the FireBeetle is blank and second is labeled VCC, on my board the first pin header is VCC. Also looking at the reference image the wires don't go to the corriposnding labeled port on the other side. For example, GND on Accelerometer appears to go to 3V3, SCL to GND, SDA to SCL, and the SDA port on the FireBeetle is empty. The documentation clearly spells out which labels to to which apart from the accelerometer where the documentation is vague and image unclear. If anyone can advise I would much appreciate it. — Reply to this email directly, view it on GitHub <#129>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACQPWFT4SJ4IFBUWWTEJ74D2Q5Q5FAVCNFSM6AAAAABXTYIL72VHI2DSMVQWIX3LMV43ERDJONRXK43TNFXW4OZXHE4TSNRXGQ> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[alex-code]

The firebeetle only has 2 GND pins but if you use an accelerometer you'll need 3.

1. GND for switch
2. GND for accelerometer
3. GND for rotary encoder

To make it simpler I used solid core jumper wire for the accelerometer so needed to share the last GND pin between the power switch and rotary encoder.

The picture is at a bit of an angle so maybe gives the wrong impression but the I2C pins on the firebeetle should all be opposite the accelerometer.

Firebeetle	Accelerometer
3v3	VCC
GND	GND
SCL	SCL
SDA	SDA

The VCC pin on the firebeetle should be empty.

Different angle picture here, accelerometer

[cameroncooke]

Thank you. It probably should have been obvious just was confused as the VCC didn't go to VCC on the Firebettle.

[alex-code]

It's unfortunate positioning that two components next to each other have the VCC labels as they shouldn't be connected.

I can add some more info to the docs.

[cameroncooke]

I didn't have any small single-core wire with a small enough diameter, so I soldered two right-angled pin headers together and wrapped them in heat shrink. It works well.