This repository contains some experimental setup for using the esp32-2432s028 develoment board with tft display within Home Assistant. Only a few gpio pins are exposed and usable, but by using I²C you could use a MCP23017 module to add additional ports.
All credits for extended pinout explanation go to macsbug, see more on: https://macsbug.wordpress.com/2022/08/17/esp32-2432s028/
Flashing instructions: keep the boot button pressed when you plug in the USB cable/flasher, this will allow to flash the firmware.
Two separate SPI busses are being used for the display and the touchscreen.
spi:
- id: lcd
clk_pin: GPIO14
mosi_pin: GPIO13
miso_pin: GPIO12
- id: touch
clk_pin: GPIO25
mosi_pin: GPIO32
miso_pin: GPIO39The esp32-2432s028 has an ili9341 display that can be used via the lcd SPI bus:
display:
- platform: ili9xxx
model: ILI9341
spi_id: lcd
cs_pin: 15
dc_pin: 2
lambda: |-
...
# Former led pin in the display config
output:
- platform: ledc
pin: 21
id: former_led_pin
# Define a monochromatic, dimmable light for the backlight
light:
- platform: monochromatic
output: former_led_pin
name: "Display Backlight"
id: back_light
restore_mode: ALWAYS_ONTo add touch functionalities, a touchscreen component should be added via the touch SPI bus:
touchscreen:
platform: xpt2046
spi_id: touch
cs_pin: 33
interrupt_pin: 36
update_interval: 50ms
threshold: 400
calibration:
x_min: 280
x_max: 3860
y_min: 340
y_max: 3860
transform:
mirror_x: true
mirror_y: false
swap_xy: false
The default gpio pins for I2C on an ESP32 are GPIO21 and GPIO22. Both of them are exposed in the extended IO connector (P3), but apparently GPIO21 is also used as a led pin in the lcd SPI bus, so it looks as if this gpio pin is somehow useless on the extended IO connector. GPIO35 which is also exposed in the extended IO connector can only be used for input, so also useless for I2C. Luckily there is another connector with GPIO27, which makes it possible to setup an I2C bus.
i2c:
sda: GPIO27
scl: GPIO22
scan: true
id: bus_a# Define pins for backlight display and back LED1
output:
- platform: ledc
pin: GPIO21
id: former_led_pin
- platform: ledc
id: output_red
pin: GPIO4
inverted: true
- platform: ledc
id: output_green
pin: GPIO16
inverted: true
- platform: ledc
id: output_blue
pin: GPIO17
inverted: true
# Define a monochromatic, dimmable light for the backlight
light:
- platform: monochromatic
output: former_led_pin
name: "Display Backlight"
id: back_light
restore_mode: ALWAYS_ON
- platform: rgb
name: LED
red: output_red
id: led
green: output_green
blue: output_blue
restore_mode: ALWAYS_OFFsubstitutions:
devicename: "esp32-2432s028"
ssid: Esp32-2432S028 Fallback Hotspot
static_ip: 192.168.0.44
gateway: 192.168.0.1
subnet: 255.255.255.0
packages:
wifi: !include common/wifi.yaml
esphome:
name: $devicename
build_path: ./build/$devicename
esp32:
board: esp32dev
framework:
type: arduino
logger:
api:
ota:
- platform: esphome
captive_portal:
spi:
- id: lcd
clk_pin: GPIO14
mosi_pin: GPIO13
miso_pin: GPIO12
- id: touch
clk_pin: GPIO25
mosi_pin: GPIO32
miso_pin: GPIO39
i2c:
sda: GPIO27
scl: GPIO22
scan: true
id: bus_a
color:
- id: my_red
red: 100%
green: 0%
blue: 0%
- id: my_orange
red: 100%
green: 50%
blue: 0%
- id: my_yellow
red: 100%
green: 100%
blue: 0%
- id: my_green
red: 0%
green: 100%
blue: 0%
- id: my_blue
red: 0%
green: 0%
blue: 100%
- id: my_teal
red: 0%
green: 100%
blue: 100%
- id: my_gray
red: 70%
green: 70%
blue: 70%
- id: my_white
red: 100%
green: 100%
blue: 100%
font:
- file: "Helvetica.ttf"
id: helvetica_48
size: 48
- file: "Helvetica.ttf"
id: helvetica_36
size: 36
- file: "Helvetica.ttf"
id: helvetica_24
size: 24
- file: "Helvetica.ttf"
id: helvetica_12
size: 12
image:
- file: "power-off-button.png"
id: on_off_button
- file: "radio-station.png"
id: radio
binary_sensor:
- platform: status
name: "Node Status"
id: system_status
- platform: touchscreen
name: Power
x_min: 30
x_max: 90
y_min: 20
y_max: 80
- platform: touchscreen
name: Music
x_min: 150
x_max: 210
y_min: 20
y_max: 80
time:
- platform: homeassistant
id: esptime
text_sensor:
- platform: template
# name: Uptime Human Readable
id: uptime_human
icon: mdi:clock-start
internal: True
- platform: wifi_info
ip_address:
# name: ESP IP Address
id: ip_address
sensor:
- platform: uptime
# name: Uptime Sensor
internal: True
id: uptime_sensor
update_interval: 1s
on_raw_value:
then:
- text_sensor.template.publish:
id: uptime_human
state: !lambda |-
int seconds = round(id(uptime_sensor).raw_state);
int days = seconds / (24 * 3600);
seconds = seconds % (24 * 3600);
int hours = seconds / 3600;
seconds = seconds % 3600;
int minutes = seconds / 60;
seconds = seconds % 60;
return (
("Uptime ") +
(days ? to_string(days) + "d " : "") +
(hours ? to_string(hours) + "h " : "") +
(minutes ? to_string(minutes) + "m " : "") +
(to_string(seconds) + "s")
).c_str();
- platform: wifi_signal
# name: "WiFi Signal Sensor"
internal: True
id: wifi_signal_sensor
update_interval: 5s
- platform: bmp280_i2c
temperature:
name: "Temperatuur"
unit_of_measurement: °C
accuracy_decimals: 1
id: "bme_temperature"
pressure:
name: "Luchtdruk"
unit_of_measurement: hPa
accuracy_decimals: 0
id: "bme_humidity"
address: 0x76
update_interval: 30s
display:
- platform: ili9xxx
model: ILI9341
spi_id: lcd
cs_pin: 15
dc_pin: 2
invert_colors: false
lambda: |-
int hs = it.get_width() / 2; // Horizontal Spacing = text data horizontal center point
int hq = it.get_width() / 4; // text data horizontal center for two vertical lines
int vs = it.get_height() / 8; // Vertical Center = text data vertical center point = how many lines
int line_gap = 21; // distance of line from center of data text
it.rectangle(0, 0, it.get_width(), it.get_height(), id(my_blue));
it.rectangle(0, 20, it.get_width(), it.get_height(), id(my_blue));
it.strftime(5, 5, id(helvetica_12), id(my_white), TextAlign::TOP_LEFT, "%H:%M:%S", id(esptime).now());
it.print(hs, 5, id(helvetica_12), id(my_blue), TextAlign::TOP_CENTER, "${devicename}"); //print title
if (id(system_status).state) {
it.print(it.get_width()-5, 5, id(helvetica_12), id(my_green), TextAlign::TOP_RIGHT, "Online");
}
else {
it.print(it.get_width()-5, 5, id(helvetica_12), id(my_red), TextAlign::TOP_RIGHT, "Offline");
}
it.line(0, it.get_height()-20, it.get_width(), it.get_height()-20, id(my_blue)); // line across bottom above footer text
it.printf(5, it.get_height()-3, id(helvetica_12), id(my_gray), TextAlign::BOTTOM_LEFT, "%s", id(uptime_human).state.c_str());
it.printf(hs, it.get_height()-3, id(helvetica_12), id(my_gray), TextAlign::BOTTOM_CENTER, "%.0fdBm", id(wifi_signal_sensor).state);
it.printf(it.get_width()-5, it.get_height()-3, id(helvetica_12), id(my_gray), TextAlign::BOTTOM_RIGHT, "%s", id(ip_address).state.c_str());
it.image(hq - 25, 50, id(on_off_button));
it.image(3*hq - 25, 50, id(radio));
it.line(0, vs * 3, it.get_width(), vs * 3, id(my_blue));
it.print(hs, vs * 3 + line_gap, id(helvetica_24), id(my_white), TextAlign::CENTER, "BME280 sensor");
it.line(0, vs * 4, it.get_width(), vs * 4, id(my_blue));
it.print(hq, vs * 5, id(helvetica_12), id(my_white), TextAlign::CENTER, "Temperature:");
it.printf(3*hq, vs * 5, id(helvetica_12), id(my_white), TextAlign::CENTER, "%.1f°C", id(bme_temperature).state);
it.print(hq, vs * 6, id(helvetica_12), id(my_white), TextAlign::CENTER, "Pressure:");
it.printf(3*hq, vs * 6, id(helvetica_12), id(my_white), TextAlign::CENTER, "%.0fhPa", id(bme_humidity).state);
# Define pins for backlight display and back LED1
output:
- platform: ledc
pin: GPIO21
id: former_led_pin
- platform: ledc
id: output_red
pin: GPIO4
inverted: true
- platform: ledc
id: output_green
pin: GPIO16
inverted: true
- platform: ledc
id: output_blue
pin: GPIO17
inverted: true
# Define a monochromatic, dimmable light for the backlight
light:
- platform: monochromatic
output: former_led_pin
name: "Display Backlight"
id: back_light
restore_mode: ALWAYS_ON
- platform: rgb
name: LED
red: output_red
id: led
green: output_green
blue: output_blue
restore_mode: ALWAYS_OFF
touchscreen:
platform: xpt2046
spi_id: touch
cs_pin: 33
interrupt_pin: 36
update_interval: 50ms
report_interval: 1s
threshold: 400
calibration:
x_min: 280
x_max: 3860
y_min: 340
y_max: 3860
transform:
mirror_x: true
mirror_y: false
swap_xy: false
# Exposed switches.
switch:
- platform: restart
name: ESP32-2432S028 Restart
Using one of the above enclosure options, a 600 MAh 3.7V battery and a MT3608 step-up convertor, I tried to make a Home Assistant remote control. Conclusion: it works, but unfortunately I didn't manage to keep it working for an acceptable period of time, even with deep sleep implemented.
