Is SN65HVD230 TWAI CAN Transceiver Compatible with Home Assistant (ESPHome)?
Electrical Specifications
Always confirm pin assignments against the manufacturer datasheet before wiring.
Compatibility Overview
Integrated 3.3V CAN bus transceiver leveraging ESP32-S3 TWAI peripheral for industrial CAN networks.
Wiring
Host connections for this device
Technical Specification Matrix
| Feature / Attribute | Specification / Status |
|---|---|
| Hardware Protocol | TWAI GPIO / 3.3V |
| Bridge Required | NO |
| Border Router Needed | None |
| Hardware Capabilities & Peripherals | Vehicle Telemetry CAN Frame Receiver Bus Errors Note: these entities come from the ESPHome configuration you flash — each one needs its matching component in that YAML before it appears. |
| Pairing Complexity | Advanced |
| Factory Reset Instruction | Hold BOOT button while cycling 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_canbus_ha.yaml and run esphome run emb_esp32s3_canbus_ha.yaml. The first flash goes over USB. If it is not detected, hold BOOT button while cycling 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 SN65HVD230 TWAI CAN Transceiver on ESP32-S3. Untested on hardware — verify wiring and pins against your own board.
# ESPHome configuration for SN65HVD230 TWAI CAN Transceiver
# 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_canbus_ha
friendly_name: "SN65HVD230 TWAI CAN Transceiver"
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
# The ESP32's own CAN (TWAI) controller, with the SN65HVD230 as a bare
# transceiver: no SPI, no crystal to match, 3.3V throughout.
canbus:
- platform: esp32_can
id: can_bus
tx_pin: GPIO5
rx_pin: GPIO4
can_id: 4
bit_rate: 500KBPS
on_frame:
- can_id: 0
can_id_mask: 0
then:
- lambda: |-
ESP_LOGI("can", "Frame id 0x%03X, %d bytes", can_id, x.size());
button:
- platform: template
name: "Send Test Frame"
on_press:
then:
- canbus.send:
canbus_id: can_bus
can_id: 0x123
data: [0x01, 0x02, 0x03]
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 SN65HVD230 TWAI CAN Transceiver? Submit a pull request or report corrections to our index.