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61 lines
3.0 KiB
61 lines
3.0 KiB
# thermi2C - a thermal camera app for the jolla 1 phone
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This is an app used to interface a cheap melexis MLX90640 thermal camera (~35€ for the sensor) with a Jolla 1 phone, using the phone's built-in I2C bus.
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Note that the app is closer to a tech demo than a full thermal camera driver app, it can't do temperature readings just yet, or pictures, all you get is a direct view of the thermal sensor at ~11fps (due to I2C bus speed limitations on this phone). But at least you get quite a few themes for color :\)
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## screenshots
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### regular mode
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Sometimes the checkerboard pattern that is created due to interlacing doesn't go away, this is me waving at the camera:
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<img src="./images/therm.png" alt= “” width="300" height="value">
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### demo mode
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The app also has a demo mode for when the sensor fails/ isn't connected, it'll display perlin noise on the UI where the thermal view should be.
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theme hotiron | theme gray
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:-------------------------:|:-------------------------:
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**note:** __leaving the noise generation on can cause issues with the normal mode of operation (flashing), so this line needs to be commented for the demo mode to be available:__
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```c++
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#include <stdint.h>
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#define IGNORE_I2C_DISCONNECTS //comment out this line to enable noise generation / demo mode
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class MLX90640 : public QObject
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```
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Found in `mlx90640_API.h` line 92
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## credits
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This app uses code from these other repos:
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https://github.com/kimmoli/i2ctool
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(used for some of the I2C code, but largely reworked to maximize byte capacity and speed)
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https://github.com/melexis/mlx90640-library
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(used for most of the thermal sensor logic, also modified and objectified [C -> C++])
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## hardware
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You'll need a jolla 1 phone (2014)
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The 5V and INT pins on the phone are unused, here's the wiring:
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(N means unused here, i didn't bother to mark the 5V pin). I used some nickel strips to contact witht he pogo pins, this works quite well, a soldering iron can be used to melt the pins into their proper position.
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Some parts of the case are open, if you don't like this you can edit the fusion 360 project i dropped in ./stl/ and make your own.
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i usually get my sensors from there (MLX90640ESF-BAA):
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https://fr.aliexpress.com/item/1005004645739586.html
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## Compiling the app
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As for the SDK setup, you'll need the sailfish SDK (latest), **and this is important**: ***with*** version 3.4.0 OS target, which is the latest one the jolla 1 phone supports (or you can use your phone's current version if you don't want to update to 3.4).
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the sdk here: https://docs.sailfishos.org/Tools/Sailfish_SDK/
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for debugging i highly recommend this, to at least check that the camera IS connected and responding:
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https://github.com/kimmoli/i2ctool
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Probe with it, address 33 should light up green. If it doesn't either you wired it wrong or your camera's dead.
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this app can also be installed directly from the jolla store, easier to get working imo.
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Happy hacking! |