Tips & Tricks
Temperature Dependence
The display refresh speed depends on the environmental temperature. Thus, if your room temperature is significantly different from ~22°C, grayscale accuracy might be affected when using the builtin waveform. This can be mitigated by using a different timing curve, but this would require calibrating the display timings at that temperature. If you did this for some temperature other than room temperature, please submit a pull request!
Deep Sleep Current
Board Revision V5 is optimized for running from a battery thanks to its low deep sleep current consumption. In order to achieve the lowest possible deep sleep current, call
epd_deinit()
before going to deep sleep. This will de-initialize the I2S peripheral used to drive the diplay and bring the pins used by epdiy to a low-power state. You should be able to achieve a deep-sleep current of less than 13µA. If your deep-sleep current is much higher, please check your attached peripherals. With some modules, you have to isolate GPIO 12 before going to deep sleep:
rtc_gpio_isolate(GPIO_NUM_12)
Adding a New Display
This section is work-in-progress.
Add display definitions in
displays.candepd_display.h.Include waveform in
bulitin_waveforms.cCalibrate timing curve in
scripts/generate_epdiy_waveforms.py.Add to the list of displays to build waveforms for in
MakefileDocument