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86 lines
3.1 KiB
ReStructuredText
86 lines
3.1 KiB
ReStructuredText
ESP32 CAN
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=========
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.. seo::
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:description: Instructions for setting up the ESP32 CAN bus platform in ESPHome
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:image: canbus.svg
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:keywords: CAN, ESP32
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The ESP32 has an integrated CAN controller and therefore doesn't necessarily need an external controller.
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You only need to specify the RX and TX pins. Any GPIO will work.
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.. code-block:: yaml
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# Example configuration entry
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canbus:
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- platform: esp32_can
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tx_pin: GPIOXX
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rx_pin: GPIOXX
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can_id: 4
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bit_rate: 50kbps
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on_frame:
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...
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Configuration variables:
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------------------------
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- **rx_pin** (**Required**, :ref:`Pin <config-pin>`): Receive pin.
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- **tx_pin** (**Required**, :ref:`Pin <config-pin>`): Transmit pin.
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- **rx_queue_len** (**Optional**, int): Length of RX queue.
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- **tx_queue_len** (**Optional**, int): Length of TX queue, 0 to disable.
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- All other options from :ref:`Canbus <config-canbus>`.
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.. _esp32-can-bit-rate:
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The following table lists the bit rates supported by the component for ESP32 variants:
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=================== ======= ========== ========== ========== ========== ==========
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bit_rate ESP32 ESP32-S2 ESP32-S3 ESP32-C3 ESP32-C6 ESP32-H2
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=================== ======= ========== ========== ========== ========== ==========
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1KBPS x x x x x
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5KBPS x x x x x
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10KBPS x x x x x
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12K5BPS x x x x x
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16KBPS x x x x x
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20KBPS x x x x x
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25KBPS x x x x x x
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31K25BPS
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33KBPS
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40KBPS
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50KBPS x x x x x x
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80KBPS
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83K38BPS
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95KBPS
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100KBPS x x x x x x
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125KBPS (Default) x x x x x x
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250KBPS x x x x x x
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500KBPS x x x x x x
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800KBPS x x x x x x
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1000KBPS x x x x x x
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=================== ======= ========== ========== ========== ========== ==========
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Wiring options
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--------------
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5V CAN transceivers are cheap and generate compliant levels. If you power your
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board with 5V this is the preferred option. R501 is important to reduce the 5V
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logic level down to 3.3V, to avoid damaging the ESP32. You can alternatively
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use a voltage divider here instead.
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.. figure:: images/canbus_esp32_5v.png
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:align: center
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:target: ../_images/canbus_esp32_5v.png
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If you prefer to only have a 3.3V power supply, special 3.3V CAN transceivers are available.
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.. figure:: images/canbus_esp32_3v3.png
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:align: center
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:target: ../_images/canbus_esp32_3v3.png
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See Also
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--------
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- :doc:`index`
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- :apiref:`canbus/canbus.h`
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- :ghedit:`Edit`
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