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Hopefully you’ve done the full setup described throughout this doc. If you have, the launchpad subsystem is embedded into your venv already! in your terminal (with the venv active), simply run
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launchpad install |
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You should be greeted with a message bunch of installs- and this sets up the ESP32 specific tooling. In order for these changes to be recognized, you should deactivate and then reactivate the ner-venv.
You'll need to then clone the launchpad repo - place it in the same NER folder described in the setup. This repo has a “src” folder with a main file with an outline, and then some other miscellaneous files and folders. You shouldn’t need any files beyond this main.
You also should have one of the esp dev kits and a magnet from us.
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That's all! You are not expected to necessarily know anything about freeRTOS, interrupts, or any of these skills; Just because I haven’t in detail explained these things in this doc does not mean you are expected to understand it. I literally am keeping these instructions somewhat vague intentionally to ensure I don't sway you towards doing this a certain way, because there are multiple ways to do it. Ask questions, do some individual investigation, or use whatever tools you want to help. freeRTOS and interrupts are used extensively in our vehicle apps, so getting some experience with them here will help out.
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To view the Bluetooth data, download the NRF connect app on your phone. In the scanner, you should see an ESP device. Connect to that and you should be able to see the message!
4. Tips/keep in mind
While it isnt conceptually important, ESP32 and freeRTOS specific syntax will be used in your code. I would piroritze understanding conceptually what you need to do - and then using online resources to figure out how to use their syntax to achieve that goal
The value returned from the sensor is a raw ADC value. This means it is a unitless value, understood as a strength “percentage”. To understand this value, the resolution of the ADC needs to be known. You'll notice the starter code defines this as 12 bits. This value is simply the number of bits used to depict this percentage - the more bits, the higher the precision you are able to achieve.
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Again, please ask questions! Bay times and meetings will dedicate time for launchpad discussions, if you are new to embedded, this stuff may seem really confusing and we are here to help make it less daunting.