energydisplay

This is an energy status display that uses a 400x300 e-ink screen by Waveshare and a standard ESP32 with integrated WiFi. The data is fetched from a Raspberry Pi or Beaglebone or any http web server for that matter. Getting the data into the relevant files is done elsewhere, this is just a display. There's one file for the core values, and then two text files for the histogram data for PV energy production and domestic power usage.

To extend the lifetime of the e-ink display, the image is refreshed only once every 5 minutes. Your SSID, wifi password and URL to fetch the files has to be filled into the relevant variables in the source.

The following libraries are needed to compile:

• The Display Library GxEPD. It can be found at https://github.com/ZinggJM/GxEPD. This implementation uses V3.1.
• As an dependcy the Adafruit GFX Library must also be installed. It can be found at https://github.com/adafruit/Adafruit-GFX-Library.

The used pins are 3, 5, 16, 17, 18, 19 and 23 as per the sourcecode, but this can be changed as needed. Wiring is up to personal preference.

A color LCD version with animations for use with the M5Stack line of modules can be found on https://github.com/dividebysandwich/energydisplay-m5 as well.

/energydisplay/state

line	name	value	unit	description
1	battery	0-100	%	battery state in percent
2	pv	0.0-99.9	kW	current PV power
3	use	0.0-99.9	kW	current usage
4	grid	-99.9-99.9	kW	current power from or to grid
5	battuse	-99.9-99.9	kW	current power from or to the battery
6	curtime	00:00-23:59		current time (formatted)
7	curdate	02.11.2023		current date (formatted)

/energydisplay/lastpv

line	name	value	unit	description
1	current	0-65535	W	pv power output
...
130	latest	0-65535	W	pv power output

/energydisplay/lastuse

line	name	value	unit	description
1	current	0-65535	W	power usage
...
130	latest	0-65535	W	power usage