Automatic Fog Warning System
System background
In northern Taiwan, extreme fog is common and frequently causes traffic accidents. An automated fog warning system would provide drivers with preventive warnings and lights in foggy conditions.
System requirements
One powerful PC-based controller was needed to process the complex data acquisition and control system. The system needed to connect to visibility sensors, analyze fog density, control fog lamps along the road, and report wirelessly to the traffic center for fog alerts. The solution must meet the following requirements:
GPRS access
RS-232 port to connect to fog detection devices
8 digital output channels for fog lamps
Digital input channel for door alarms
Solution description
Moxa's IA240 embedded computers running Linux programs form the core of the system. The ARM-based controllers connect to fog detection devices and the Oncell G2150I via RS-232, and to the ioLogik E2210 using Ethernet. The IA240 easily established Linux I/O communication with the ioLogik E2210 by leveraging Moxa's MXIO library. Empowered with Click&Go™ control logic, the ioLogik E2210 can automatically turn connected fog lamps on or off in response to the fog reading decoded by the IA240 computer. A cabinet door alarm and sensor were also connected to the ioLogik E2210 for intrusion monitoring. With the Oncell G2150I installed, the system includes wireless communications over cellular networks for fog data transmission. In this way, the traffic center was able to provide real-time visibility information along the road and acknowledge the fog warning when necessary.
Moxa's Linux Solution:
Easy Linux programming with MXIO library
Real-time event messages by TCP, UDP, eMail, SNMP Trap
Superior embedded Linux performance
High-performance computing capability
IF-THEN-ELSE Click&Go™ logic for local output control
Highly integrated with all Moxa products
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