LeisureCAN

The open source CAN-Bus network for leisure vehicles

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functional_specification [2021/01/16 10:05]
christian [Advantages]
functional_specification [2021/01/17 17:29] (current)
christian [What is a CAN Bus?]
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-====== Functional Specification ====== +====== Functional Overview ====== 
-===== Overview =====+===== Introduction =====
 LeisureCAN is a CAN-Bus system designed for the leisure vehicle industry - campervans, boats, caravans, ... LeisureCAN is a CAN-Bus system designed for the leisure vehicle industry - campervans, boats, caravans, ...
  
-It allows manufacturers to control all electrical and electronical components of the leisure side of the vehicle through a single CAN Bus. Any component can be switched from anywhere on the bus system, and any measurement taken can be displayed or used anywhere on the bus.+It allows manufacturers and owners to control all electrical and electronic components of the leisure side of the vehicle through a single CAN Bus. Any component can be switched from anywhere on the bus system, and any measurement taken can be displayed or used anywhere on the bus.
  
 ===== What is a CAN Bus? ===== ===== What is a CAN Bus? =====
-CAN (Control Area Network) technology was designed for the automotive industry in the 1990s. Nowadays, pretty much every new car has a CAN bus system that controls the engine, temperature, lights, indicators, etc. through a single bus system. They are very reliable (if electronics fail, it's usually not the bus itself, but individual components), and have been manufactured in the millions. That means the individual components are cheap, ubiquitous and reliable.+CAN (Controller Area Network) technology was designed for the automotive industry in the 1990s. Nowadays, pretty much every new car has a CAN bus system that controls the engine, temperature, lights, indicators, etc. through a single bus system. They are very reliable (if electronics fail, it's usually not the bus itself, but individual components), and have been manufactured in the millions. That means the individual components are cheap, ubiquitous and reliable.
  
 ===== LeisureCAN functionality ===== ===== LeisureCAN functionality =====
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 The huge advantage of a LeisureCAN system is that it's freely configurable, and the configuration can be changed at any time. If the user wants to add a new component (e.g. a new switch), he/she can just do that, and then configure which device reacts to the switch. In the same manner, a new device can be connected to the relay output of a LeisureCAN unit, and then be configured to be switched on by a set of events on the bus, e.g. a switch that's operated, ...  The huge advantage of a LeisureCAN system is that it's freely configurable, and the configuration can be changed at any time. If the user wants to add a new component (e.g. a new switch), he/she can just do that, and then configure which device reacts to the switch. In the same manner, a new device can be connected to the relay output of a LeisureCAN unit, and then be configured to be switched on by a set of events on the bus, e.g. a switch that's operated, ... 
  
-Once the bus cable and a pair of power cables are fitted throughout the vehicle, new components can be added with a minimal amount of wiring required. Just hook up the new component to the power cable, and connect it to a relay output of the nearest LeisureCAN unit, and you are ready to go.+Once the bus cable and a pair of power cables are fitted throughout the vehicle, new components can be added with a minimal amount of wiring required. Just hook up the new component to the power cable (don't forget the fuse!), and connect it to a relay output of the nearest LeisureCAN unit, and you are ready to go.
  
 When you first think about a CAN bus, you might worry that this is a more complex system than a traditionally wired electrical installation. When you first think about a CAN bus, you might worry that this is a more complex system than a traditionally wired electrical installation.
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 If you have a bit of computer knowledge, you can fix the system yourself with a bag of parts worth £50, a soldering iron and a multimeter. If you have a bit of computer knowledge, you can fix the system yourself with a bag of parts worth £50, a soldering iron and a multimeter.
 +
 +The little OLED display on the master control unit also shows all events on the bus, so a faulty switch can be diagnosed within seconds. You flick the switch, and there is no message on the bus -> you have a faulty switch. Diagnosed without opening anything, without measuring anything, without following cables through small spaces, ...
 ===== Disadvantages ===== ===== Disadvantages =====
 You could argue that a traditional copper cable wiring to each component is more reliable, but you have to take into account that you have a lot more connectors, cables, etc. running through your vehicle. All those provide additional points of failure. You could argue that a traditional copper cable wiring to each component is more reliable, but you have to take into account that you have a lot more connectors, cables, etc. running through your vehicle. All those provide additional points of failure.
functional_specification.1610787952.txt.gz · Last modified: 2021/01/16 10:05 by christian