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circuitpython-calculator

Handheld Calculator running on CircuitPython. The hardware is a Keyboard Featherwing V2 from arturo182, an Adafruit Feather M4 Express and a 2000mAh LiPo battery. Circuitpython is a custom build which enables float64 (double) math as well as the cmath module. The supplied patches circuitpython-*.diff should work on 9.0.x and 9.1.x, respectively - the build script automates the build process, and sits on top of Adafruit's build-circuitpython. Make sure you understand this first.

All of this is still very raw but workable.

More information about building this device is here.

The supplied patch implements the following:

  • it enables FP64 math on the supported platforms (atmel-samd raspberrypi espressif mimxrt10xx)
  • it adds a numerical integration module ulab.scipy.integrate.

The CIRCUITPY contains the scripts that are supposed to be uploaded to your board.

  • umath.py is a wrapper on top of FP64 math and cmath, and transparently invokes numpy.array, float or complex routines for the math functions.
  • uncertainty.py is a rewrite / port of Python uncertainties to Circuitpython (mainly omitting several dependencies) and works in a very similar way.
  • ufractions.py does the same for Python fractions.

Building the image

Edit the build script 'circuitpython-prep.sh' to prepare the local repo, then run it, then build the desired image.

CIRCUITPY/Bitmaps

contains blinka images converted from the C source code.

CIRCUITPY/Decimal

contains some math on top of jepler-udecimal (https://github.com/jepler/Jepler_CircuitPython_udecimal). umath.py complements hyperbolic and some other functions, and cdmath.py, well, complex decimal math. Abandoned in favor of modifying Circuitpython mainly due to memory consumption but workable. Maybe useful for someone.

LVGL+Micropython

The lvgl-micropython patch adds FP64 and numerical integration to the lvgl_micropython fork. It is a direct spinoff of my earlier patch for Circuitpython 9.x.

Images

The images directory contains the images that were originally in the Adafruit Playgound article. It seems I cannot upload them there any more.

A couple of sample commands.

Fig. 1 A couple of sample commands.

A couple of sample commands.

Fig. 2 View from the backside.

A couple of sample commands.

Fig. 3 View from the backside with the Feather M4 removed. You can see the resistors for the voltage divider.

A couple of sample commands.

Fig. 4 Some commands enlarged.

A couple of sample commands.

Fig. 5 The battery charge current hack.