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E-Paper display for viewing sensor data from Home Assistant.

esphome homeassistant

ha-epaper-display's Introduction

HA Sensor ePaper Display

E-Paper display for viewing sensor data from Home Assistant. This firmware is based on ESPhome, so you need to install ESPhome and compile .yaml file by yourself.

Sensors data

The display shows PM2.5 value, temperature and humidity. Each set for indoor and outdoor.

I made PM2.5 the most prominent value. Because air pollution is currently a serious problem here in my hometime. Moreover, if the value exceeds the safety threshold, a warning sign will be displayed.

Hardware

Parts:

Waveshare 4.2" ePaper display
ESP8266 Wemos D1 Mini
3D-Printed Case, it can be found on my thingiverse page. [https://www.thingiverse.com/thing:4772803]
Stock M3 Screws from ePaper display

Note: You might need to apply some adhesives to 3d-printed parts joints, and also put some counterweight on the base to make it harder to tip over. This is my very first time designing 3D things, so it’s not perfect yet.

Wiring:

Connecting the display to Wemos D1 Mini is very straightforward. However, I soldered all wires diretly on both display and MCU in order to make it low-profile as much as possible.

ePaper Display Pin	ESP8266 Pin
BUSY	GPIO16
RST	GPIO04
DC	GPIO12
CS	GPIO15
CLK	GPIO14
DIN	GPIO13
GND	GND
3.3v	3.3v

How to use?

Install ESPhome on your computer or Home Assistant Add-on
Copy yaml file and fonts folder to your ESPhome folder.
Edit your Wi-Fi SSID/Password, sensors entity ID, etc. as your own preference.
Connect hardwares together.
Flash the firmware. I reccommended you to not flash via OTA.
Go to Home Assistant, it should automatically discovered your espHome display. If not, add it manually using IP address via ESPhome integration.
Enjoy!

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ha-epaper-display's Issues

GPIO15 not available for general purpose GPIO and causes issues flashing D1 Mini

Hi,

Thanks for this project, I have really enjoyed putting it together.

The README suggests connecting the screen's CS pin to GPIO15, which I found caused issues flashing the D1 Mini. The ESPHome ESP8266 documentation says GPIO15 is a "Special Pin" used to control the boot mode and isn't available for general purpose GPIO, which explains my issue.

I swapped the CS pin from GPIO15 to GPIO5 which is available for general purpose GPIO and things are back to working.

May I suggest modifying the README to replace the reference to GPIO15 with GPIO5.

An example configuration YAML would look like this:

spi:
  clk_pin: 14 # or GPIO14
  mosi_pin: 13

display:
  - platform: waveshare_epaper
    id: epaper_display
    cs_pin: 5
    dc_pin: 12
    busy_pin: 16
    reset_pin: 4
    model: 4.20in
    update_interval: 30s
    lambda: |-

# etc

Power Source

Hey,

What is the power source for this. It looks built-in from the pictures but I did not see a schematic or part for batteries.

edit: never mind it looks like that was just static displaying.

Temp

How to make temperature and pollution change place?? Please help :)

How display thermometer icon

file: 'fonts/materialdesignicons-webfont.ttf'
id: mdi_small
size: 31
glyphs: [
'󰤫', # mdi-wifi-strength-alert-outline
'󰔏', # mdi-themometer
'󰖎' # mdi-water-percent
]

it.print(375, 75 + offsetY, id(mdi_small), TextAlign::BASELINE_CENTER, "󰔏"); //thermometer

can display the thermometer icon?
how display other icon?

Battery

Hi,

great job :-)
Is it possible to powered the device with battery ?

STL Files

Nice Project.
I use it for display some datas from my Huawei Solar Stuff.
Can u provide the STL Files for the case?

Displaying Time

Can you use an e-ink display as a clock?, is it fast enough to refresh every minute?

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