Programming the "JZ-801 Digital LED Relay Board" isn't particularly intuitive,
but it isn't difficult once you get spend some time at it.
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First, you need to connect your power adapter to the timer board. As I said
earlier, the adapter needs to output DC voltage , from 9 to 15 volts, and be
capable of supplying at least 0.1 amps (100ma). It might be a spare unit from
an old calculator, answering machine, modem, printer, etc.
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The relay board is protected by a diode so it won't be damaged by incorrectly
wiring the board.
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Use a pair of scissors (or wire cutters) to snip off the plug at the
end of the adapter's wires, then strip off 1/4" of the insulation from the
two wires. Position the relay board so that the 4-terminal block is on your
left side (the 3-digit 7-segment LED is upper left). Then place one wire
from the adapter in the top terminal , using a small flat-head screw driver
to hold the wire in place. Then position the second wire immediately below
the first and screw the wire in place. Plug in the adapter, and look at the
LEDs. If they don't light up, unplug the adapter, unscrew the wires, and
switch the wires around when re-connecting them to the board.
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Once you have the board powered up, you'll notice four switches, labelled
STOP, SET, UP, and DOWN.
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Press the SET button for 3 seconds, then release. Then press the UP button
a number of times. You will see the MODE types being displayed, such as
"P1.1" , "P1.2" , "P1.3" , "P2" , etc. Stop when you get to "P3.2". Then
briefly press the SET button again.
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The letters "OP" will flash, then the existing value (in seconds) will be
displayed. Pressing the UP button will increment the time, and the DOWN
button will decrease the time. "OP" stands for "relay OPen time". Since
we want the relay to cycle every 15 minutes (900 seconds), press and
hold the ON button until the LEDs display "900", then briefly press the
SET button.
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The letters "CL" will flash. This stands for "relay CLosed time". Do the
same as above to set it to 900 seconds. Then briefly press the SET button.
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The letters "LOP" will flash. This stands for "number of LOOPS". Since we
want the relay to cycle on and off indefinitely, briefly press the DOWN
button until "- - -" is displayed. Then briefly press the SET button.
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Then press the SET button for 3 seconds.
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The board will then work as desired, with the 3-digit LED start to count
down from 900 to 0, then the relay will energize (and a small red LED light
will come on). The board will then count down from 900 to 0, and the relay
(and small LED light) will turn off. This will continue until the adapter
is removed from the wall socket.
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Because the board will be running all night, you can save some power by
having the LED display turn off after 5 minutes. To do this, press the STOP
button for 5 seconds. You will see "O-d", which means "display always On".
Press STOP so that "C-L" is displayed. This will turn the display off after 5
minutes. You will then select "ON" or "OFF" which will activate or deactivate
the relay. Make sure you select "ON". Then wait a couple of seconds and the
board will start counting down the seconds.
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In Part 4 I'll finish this project, talking about connecting the battery
pack to the relay board, and connecting the output wire.
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David
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