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GENERAL INFORMATION |
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- Home Automation Project is a set of devices which control
house or office equipment.
- HAPCAN is Open Source Hardware (schematics
and accompanying documentation available) and in large part
Open Source (source codes for firmware and
PC software).
- Each device carries a single, simple function (eg dimmer
button, relay).
- Devices are connected to one bus, which simplifies
installation. As a bus the UTP cable is used.
- Nodes on the network can communicate each other. Communication
is based on broadcasting. This means that a
module sends a message to all the others, and they decide whether
the message is useful for them.
- HAPCAN is decentralized, there is no central
module. Each node has its intelligence and can work independently.
In the event of one module failure there is uninterrupted operation
of the other modules. Defective unit does not block the bus.
- The network is scalable - easily extensible
with new modules.
- Module configuration is performed without mechanical
switches, but remotely through the bus, using PC and
software. It is possible to change a firmware of nodes also
through the bus.
- Module configuration is stored in non-volatile memory.
Loss of power does not cause loss of data.
- The system can be programmed and controlled over
the Internet.
- System control can be done with third party software such
as
OpenRemote (www.openremote.org)
- gives access from all devices with internet browser
Command Fusion (www.commandfusion.com)
- gives access from all devices with Android or iOS (iPhone,
iPad)
iRidium Mobile (www.iridiummobile.net)
- gives access from all devices with Windows, Android or iOS
(iPhone, iPad)
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TECHNICAL INFORMATION |
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- All system devices are designed with UNIV 3 CPU
processor, which is PIC18F26K80 microcontroller with pre-programmed
bootloader (or earlier UNIV 1.0 CPU processor). Bootloader allows
firmware uploading, which makes the module acts as a specific
device.
- Network topology is the bus and must be terminated on two
ends with the resistors of 120 Ohm.
- The Protocol is a CAN 2.0B bus (Controller
Area Network) with 125kbps speed.
- A bus is a four-wire, 2 wires for data and 2 for power supply.
The UTP cable is used.
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1 - CAN H
2 - CAN L
3 - not used
4 - CAN V+
5 - CAN GND
6 - not used
7 - CAN GND
8 - CAN V+
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- Length of the bus depends on the bus wire, speed and the
amount of modules. The maximum length is 500m when bus speed
is 125kbps (as in this project). Following the recommendations
of the CIA-303-1 organization CIA (CAN in Automation), when
using UTP cable and 100
modules connected, the bus maximum length is 150m. To
determine the maximum length of the bus, should also be considered:
voltage drops and maximum current consumption that must not
exceed the limit of UTP cables - 1.5 A
- The maximum number of modules on the bus is 112,
it comes from the maximum permissible load a CAN transceiver.
It is advised to not exceed 100 nodes when
using UTP cable as the bus. Buses can be combined into a larger network using CAN repeater
of any brand.
- After installation devices need to be programmed to be able
to communicate each other. Programming specifies the relationship
between nodes. There is dedicated software (HAPCAN Programmer)
to program the system. Examples of programming can be seen
here
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