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6. 5 The neon lamp control system
1. Display mode, for example: Array Electronics welcomes you !
1. 1 Display “Array”
1. 2 Display “Electronics”
1. 3 Display “welcomes you!”
1. 4 Cycle 1.1-1.3
2. Control requirements
(1) It should be automatically turned on at 18:00:00 and turned off at 23:59:59
every day.
(2) The control transition can be performed by selecting the switch manually or
automatically.
The neon lamp control system can be activated by hand at any time, but it can
also automatically run through the clock switch or the light sensitive switch.
(3) The light sensitive switch should act as a complement of the time switch.
When the light is plenty, the light sensitive switch will be automatically turned
off, while when the light becomes weak it will be automatically turned on.
What’s more, the light sensitive switch is useless from 0 o’clock to 10 o’clock
every day.
(4) Rain detector: in case of a rainy day, it should turn off automatically.
(5) Over/under voltage detector: it will be automatically turned off when its op-
erating voltage becomes too high or too low.
3.Input/output assignment
I1: connected to the rain detector
I2: connected to the over/under voltage detector
I3: connected to the light sensitive switch
I4: connected to the manual/self-acting selection switch
I5: connected to the manual switch
Q1: connected to the enable terminal “Array”
Q2: connected to the enable terminal “Electronics”
Q3: connected to the enable terminal “welcomes you!”
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