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Step 5: Operation and Theory
– The board operates in run mode unless a jumper is connected on the two right pins in the
run/prog header.
– In program mode the next and inc buttons are used to change digits and modes and increment
the setting of the digit.
– Reset is the equivalent of unplugging and plugging the board in.
– Left most digit indicates mode, the other 4 indicate the number of increments.
– For example: A display of 00100 would indicate mode 0, qty of 100 units.
– The red LED indicates the total cycle time, for example 5 minutes.
– The green LED is the relay active period in the cycle. For example 1 minute.
– In this example, the green led would be on for the first 1 minute of every 5 minute cycle. The
programming calculates the "stop" or "wait" time for you. This allows great flexibility in
setting intervals.
– The timer operates in ticks. A tick is 1/10
– The modes are as follows:
– 0 is ticks (1/10
– 1 is seconds
– 2 is minutes
– 3 is hours
– 4 is days
– Sample settings:
– 20005 = 5 minutes
– 10060 = 60 seconds
– 00030 = 30 ticks or 3 seconds (30 x .10)
– 40001 = 1 day.
Flexible examples:
To set an on time of 5 minutes once per day, set green to 20005 and red to 40001.
To set an on time of 4.5 seconds once per 90 seconds set green to 00045 and red to 10090.
To set an on time of 7.5 minutes once every hour set green to 10450 and red to 30001. (i'm using
450 seconds on this once)
The output or logic header is provided for an SSR connection. Please reference the SSR
requirements for safe operation. The logic out is a 5v signal from the transistor. No load should
be connected here and it has a resistor for protection against shorts.
The input header
th
th
sec)
of a second and is a name I have given this interval.
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