|MX025 is a pre-built module, that gives you a four-digit bright red
LED display, attached to a driver module, which offers a 24 hour clock
mode, as well as a stop watch mode, capable of counting to either 24 hours, or to 99 hours, depending on the state of a jumper! The thing is, it doesn't do the
standard 12 hour clock mode, instead it does 24 hour military time
(which is more precise, especially when you can't see the sun).
Hang the display anywhere you need a good bright clock, or stop
watch. Mount it in a case if you want, or just as is. Great for public
events, stores, timing laps, or just to have around the shop. Anywhere
you need a digital clock, you can have one, and it can be seen from
pretty far away, because it's 265mm by 95mm, and a very bright red. So
bright that it's almost uncomfortable when you have it a foot away from
your eyes, and you attempt to look straight at it.
The battery backup terminal allows you to connect 3 AA NiCads, with
your own suitable battery holder, so that in the event of a power
failure, the module will still remember the time. It has a built in
charge circuit as well, so only use rechargables (NiCad). For the main
circuit power, this module requires a 12vDC power supply, of at least
125mA (that's what the circuit draws with all segments lit up). The
circuit has a built in rectifier, so it doesn't matter if it's center
positive or negative. You can use almost any 12vDC adapter you might
have, but if you are unsure, then this is what you need.We change these power inputs to 2.1mm when ordered together (clock and adapter), the boards come with a 1.8mm barrel type connector receptacle.
Upon power-up, the display lights up, and the device begins to keep
time, beginning at midnight, (0:00, as this is a 24 hour clock) and it
will start counting the seconds. Press S2 to increment the hour (it will
also reset the seconds, for easy syncing). Press S1 to increase the
minutes (once again, the seconds will reset). Now your time is set!
While this is happening, you are still free to use the stop watch mode.
Press S3 to change modes. Now you will notice all the segments are lit
up, reassuring that you are in stop watch mode. Press S2 to start or
pause the time. While paused, if you press S1, it will reset to zero.
Sounds easy enough, eh? Good. It is! Just like using your wrist
When you are in clock mode, and you have J2 in the down position
(open), you will see the hour, and minute, and the colon will flash so
you know it's counting the seconds. To see the seconds, place J2 in the
up position (closed). You will notice it moves the hour and minutes over
to the left, and the hour is no longer visible. But now you can see the
seconds! To see the seconds and milliseconds, place J3 in the up
(closed) position. J4 is not used. J1 is for 99 hour mode. If you only need to use the stop watch running for 24 hours, leave J1 in the down (open) position, but if you want to count up until 99 hours, put it in the up position.