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readme: update instructions with more detail

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A.M. Rowsell 2026-07-04 15:47:52 -04:00
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README.md
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@ -13,7 +13,8 @@ I dunno, cause I wanted to play with these sensors and keep track of the air qua
### Prep
You need to have the pico-sdk installed. I have it installed in ~/workspace/rp2040/pico-sdk and this is currently hard-coded into CMakeFiles.txt. I'm not sure if exporting an environment variable overrides this by default, but you can always just edit it to point to wherever you have it installed.
You also need to create a file in include/ called credentials.h in the following format:
You also **must** create a file in include/ called credentials.h in the following format:
```c
#ifndef CREDENTIALS_H
@ -30,6 +31,8 @@ You also need to create a file in include/ called credentials.h in the following
This keeps your credentials separate from the git history in case you want to make/submit changes. The build will fail if you don't create this file and define those four things.
You'll also need to edit src/main.c and change the MQTT topic names to whatever you are using.
### Build
Create a new directory in the project called build. Move into that directory and run: