![]() Both ends of the bus should be terminated with 120 Ohms resistors (Rterm). Each device connected to a CAN bus is called a node. SignalingĪ CAN bus consists of two signal lines CAN High (CAN-H) and CAN Low (CAN-L) with an additional GND line for common reference. CAN bus can extend up to 1000 meters with suitable cabling but with reduced data rate with increased lengths. But unlike I2C, a CAN bus uses differential signals, has faster data rates, and can communicate reliably over longer distances. A similar interface you can think of is the I2C bus. Multiple devices can connect to the same shared bus. ![]() CAN is a de-facto communication interface extensively used in automotive and industrial applications. In this post, we will learn the basics of CAN interface, how to configure the integrated CAN bus controller of the ESP32, how to interface the TJA1051 external CAN transceiver with ESP32 and how to make two ESP32 boards communicate via the CAN interface.Ĭontroller Area Network (CAN) is a standard defining the physical description (PHY) and the Data Link Layer of a differential bus communication interface. Since it is highly likely that you have an ESP32 board with you, we thought we would use ESP32 for our first CAN bus tutorial. The ESP32 microcontroller from Espressif also has an integrated CAN bus controller. This interface has to be standardized so that the huge industry of aftermarket products can continue to exist and manufacturers of sensors and other products can save time and cost on product development.ĬAN bus was developed by Robert Bosch GmbH and it is now an ISO (International Standards Organization) approved communication interface ISO 11898 with multiple specifications released over the years. ![]() Noise, interference, voltage surges, high temperature, low temperature, vibration, and all can work against the critical electronic systems of a vehicle and put the passengers in danger. This interface has to be highly robust since the working environment of a vehicle can be unpredictable and harsh. Manufacturers quickly realized that they needed some standard communication interface that can carry information from one system to another reliably and fast enough. Mainly the ECU (Electronic Control Unit) has to get real-time data from different sensors so that it can adjust whatever output parameters in response to user input such as pressing the throttle. Since different electronic systems may be placed in different places on a vehicle, there should be some way to make them communicate with each other so that one system knows what is happening to some other system. As vehicles have become more of technology on wheels rather than just mechanical devices, the use of electronic sensors, actuators, and interfaces became vital for their functioning. CAN Bus or Controller Area Network is a communication interface standard widely used in the automotive industry.
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