Is GC9A01 1.28 Round IPS Display Compatible with Home Assistant (ESPHome)?
Electrical Specifications
Always confirm pin assignments against the manufacturer datasheet before wiring.
Compatibility Overview
Circular 240x240 pixel IPS display ideal for smart thermostat dials rotary menu displays and gauge dashboards.
Typical SPI Wiring Reference
Standard SPI signal names. This is a bus reference, not a pinout for this specific board — check the silkscreen and datasheet for its actual pin order.
Reference circuit only. A shifter is needed when the host and peripheral run at different logic levels — check both datasheets to confirm whether this applies to your pairing.
Technical Specification Matrix
| Feature / Attribute | Specification / Status |
|---|---|
| Hardware Protocol | SPI / 3.3V |
| Bridge Required | NO |
| Border Router Needed | None |
| Hardware Capabilities & Peripherals | Round Dial Screen Gauge UI Backlight Note: these entities come from the ESPHome configuration you flash — each one needs its matching component in that YAML before it appears. |
| Pairing Complexity | Intermediate |
| Factory Reset Instruction | Hold BOOT button while toggling reset. |
Wire, Flash, Adopt, Check
Wire it up
Follow the bus reference above. The host pins in the configuration are defaults — any free GPIO of the right kind will do, as long as the YAML names the pin you actually used.
Flash the configuration
Create a new device in the ESPHome dashboard (the Home Assistant add-on) and paste the configuration below into it, or save it as emb_esp32s3_round_display.yaml and run esphome run emb_esp32s3_round_display.yaml. The first flash goes over USB. If it is not detected, hold BOOT button while toggling reset to put it in download mode. Every update after that is over the air.
Adopt it in Home Assistant
Settings → Devices & Services. A node on the same network shows up as a discovered ESPHome device within a minute of joining Wi-Fi; choose Configure and enter the API encryption key from your secrets.yaml. If discovery does not find it, add the ESPHome integration by hand with the node's IP address.
Check it works
The entities on this page appear under the device in Home Assistant and update at the configured interval. The ESPHome log (Logs in the dashboard, or esphome logs) reports the setup of each component and any bus scan results at boot.
ESPHome Configuration
Starting configuration for GC9A01 1.28 Round IPS Display on ESP32-S3. Untested on hardware — verify wiring and pins against your own board.
# ESPHome configuration for GC9A01 1.28 Round IPS Display
# Host: ESP32-S3. Pin numbers below are host-side defaults — any free
# GPIO will do, and you should change them to match your own wiring.
esphome:
name: emb_esp32s3_round_display
friendly_name: "GC9A01 1.28 Round IPS Display"
esp32:
board: esp32-s3-devkitc-1
framework:
type: esp-idf
logger:
api:
encryption:
key: !secret api_encryption_key
ota:
- platform: esphome
password: !secret ota_password
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
spi:
clk_pin: GPIO12
mosi_pin: GPIO11
miso_pin: GPIO13
# The GC9A01 is driven by the ili9xxx platform under the GC9A01A model.
display:
- platform: ili9xxx
model: GC9A01A
cs_pin: GPIO10
dc_pin: GPIO9
reset_pin: GPIO8
invert_colors: true
update_interval: 1s
lambda: |-
// A round panel: the corners of the 240x240 buffer are off-glass.
it.filled_circle(120, 120, 110, Color(0, 40, 80));
it.print(120, 120, id(roboto), TextAlign::CENTER, "Hello");
font:
- file: "gfonts://Roboto"
id: roboto
size: 24
Before you flash:
the !secret values come from your
secrets.yaml, and the GPIO numbers are host-side
defaults rather than properties of this part — change them to match how you actually wired it.
Report a Pinout Error or Submit Tested Code Snippets
Found a pin mapping quirk or built a custom ESPHome YAML driver for GC9A01 1.28 Round IPS Display? Submit a pull request or report corrections to our index.