Ok, before I dropped off to sleep, I found the following article which is pretty much what I need to connect arduino to processing and have them sending data between them.
ℹ️ https://learn.sparkfun.com/tutorials/connecting-arduino-to-processing/all
- board -> processing : data from accelerometer
- processing -> board : bitmap image generated from accelerometer data
So that's today's goal, at least get processing picking up data from accelerator.
Before that happens, a little side-track
I wanted to see if I can get the accelerometer data in m/s instead of the raw data, and print it to the TFT.
Here's the bit of code that retrieves the data in m/s^2
lis.getEvent(&event);
I set the background of TFT to be black (ST77XX_BLACK).
Now when I write to the TFT, the text just writes on top of each other makine a mess after awhile. Did a little search on refreshing text on TFT, and all I needed to do was print the text with its text colour plus the background colour (in this case is black).
tft.setTextColor(color, ST77XX_BLACK);
Saved, compiled and uploaded the code and that did the trick.
Also played around setting the text size, if you are curious, this is what I used:
tft.setTextSize(3);
- Clearing existing text - https://github.com/adafruit/Adafruit-GFX-Library/issues/16
- https://github.com/adafruit/Adafruit-GFX-Library/blob/master/Adafruit_GFX.h
Now I have my data in m/s, let's get processing talking to it
I'm going to initially send over the X value.
Created my processing code and got this exception
RuntimeException: Error opening serial port /dev/cu.usbmodem14101: Port busy
🥪 BREAK 🥪
Over lunch I asked Mick that I couldn't connect to the serial port via Processing. He mentioned if I closed my Arduino IDE. 😳
Yep, very DOH! moment there.
So after lunch I closed Arduino IDE, modified the code on Processing a little and lo and behold... it worked!
Ok, I can read text, I want to read values now.
Before I do that, I'm ditching my PyProcessing code from before and changing to pure Processing now.
So do the same thing (easily replicated from the official tutorial docs drawing the grayscale image), and I wanted to save() the image as bitmap and exit() the programme, which was all fine.
Now I was looking at drawing simple shapes and lines, and have it randomised (colours between 0 and 255) and the X/Y co-ordinates in-between 240x240.
After a bit of reading through shapes and PShapes, I stuck with primative shapes, I wanted lines and various sized ellipses in various colours generated before the time lapses and gets saved to a bitmap file.
Here's a sample of the generated bitmap from Processing:
- Coordinate System and Shapes: https://processing.org/tutorials/drawing/
- PShapes: https://processing.org/tutorials/pshape/
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