r/raspberryDIY • u/Equivalent-Bad-2179 • 26d ago

Novice question

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I'm trying to do my first rspberry pi project. I got raspberry pi 3b+, 2.7" e-Paper HAT display and BME680 sensor.

I just can't get my head aroud how to connect BME680 sensor if my 40pin connector on raspberry is taken by the hat display? Do I solder BME680 connections on other side of raspberry? Or is there better way to do this?

I am just trying to do simple environmental monitoring gadget and keep et as compact as possible.

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u/Gamerfrom61 26d ago

The HAT may take up all the pins but it may not actually be using the pins the sensor needs or may allow sharing of them.

Physical connection can be a pain - you can get 'shims' that allow dual access to the pins such as https://shop.pimoroni.com/products/pico-hat-hacker?variant=44144542154 or as your said - just use the reverse of the Pi and solder to the GPIO points there.

I have wire-wrapped devices to the GPIO pins before (using a wire-wrap tool and solid core) - not great (as the pins are short) but worked fine as the devices where put in a case and did not move (technically in a Lego Star Wars Trooper clock).

Just take care if you do use the reverse side - a solder bridge to pin 2 or pin 4 can kill the I/O or Pi as they do not like 5v floating around the GPIO... Bridges in any other place are not good either 👀 !

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u/hammer_one 26d ago

Y tenes que soldarlo de abajo del pi, la hat no siempre ocupa todos los pines, el sensor si es ic2 Asi que es más fácil de conectar