Instructables
Picture of Simple Binary Clock
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This project is a kit that is available at www.etsy.com/shop/applemountain and ebay.com/applemount

This is powered over a mini USB connection. It does not interface with a computer, it only leeches power from the USB port.

This is a great project for beginners, or anyone looking for a binary clock to build, or an easy binary clock to mod.

This project took me about an hour to complete.
 
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Step 1: LED Installation

Picture of LED Installation
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LEDs do have polarity. The bases are not perfectly round. There is a flat edge on the negative side of an LED.

The footprint of the LED is silk screened on the board. Not all of the LEDs are arranged with the same polarity. Check every LED for the proper alignment.

This is the focal point of the project, so we want it to look nice. Once the LED is placed in the board, I recommend a small piece of masking tape to hold it flat on the board while it is being soldered in place. If nothing is holding LEDs in place, they may solder in place at unwanted angles.

Once they are soldered in place, the leads can be clipped off.

Placing the LEDs in the four corners first, will permit an even work environment, and make placing LEDs straight and flush against the board, easier.

Step 2: Resistors

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There are four resistors, they do not have polarity. Once they are soldered in place, the legs may be removed.

The resistors limit the current any LED's can draw to about 20mA.  Without them, the controller would be stressed and the LED's would wear out too quick.

Step 3: Capacitors & Crystal

Picture of Capacitors & Crystal
The kit contains two disk capacitors and a crystal.
None have polarity.

The crystal provides a stable oscillation source.  It "ticks" several millions times a second, which the micro-controller counts and translates into seconds, minutes and hours.  The capacitors keep the crystal stable and insure they have enough voltage to get going.
Phil B1 month ago

The photo shows the kit I built. I like using it when I awaken during the night. Before I made the wooden stand for it, I accidentally touched the solder joints on the back of the circuit board and the clock reset itself to 12:00.

The wooden stand is cut from a common 2 x 4 on a table saw and sanded a little. Two #4 sheet metal screws hold the circuit board to the wood. They are just tight enough to hold the circuit board against the wood, but not tight enough to bend the circuit board.

I did notice one LED is weaker than the others, and I need to view it directly from the front to know for certain whether it is "on" or not. I may replace it with the extra LED that was included in the kit.

Even though I used a low wattage pencil soldering iron. I still had some solder bridges and used copper wicking braid to remove extra solder. I also checked the joints with a fairly strong magnifying glass.

I grounded myself frequently to avoid static buildup that could damage the LEDs or the processor chip. By the way, the sensor used to set the clock is two metal tabs in the place where the missing LED in the middle column (top) would normally be. Sometimes I need to moisten my finger lightly to make the clock begin the setting process.

I use an old cell phone charger to power the clock, but I had to add a 2,200 micro-farad capacitor across the power leads to keep the clock from resetting to 12:00 frequently. The charger has a steady output of 5.05 volts. After adding the capacitor, the voltage reads 5.13 volts.

The cable with the mini-USB end is an extra computer linking cable from a Garmin GPS receiver we replaced with a newer model.

At night I lay the LED clockface down on my nightstand to avoid light spill that might disturb my sleep. I grab the wooden stand and raise it to read the time when I waken.

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CK1012 months ago
Is it possible to use an external battery ? What is the input 5v?
CK1012 months ago
How big does it come out to be ?
Ploopy11 months ago

Cool!

could you please post a picture of the schematic :)

(just wondering how ATtiny45 can control all those leds)

Can someone try it and also upload the program,schematic I've copied.
RAULRO2 years ago
I GOT IT, BUT I WOULD LIKE INSTALL REAL TIME CLOCK, WOULD YOU TELL ME HOW. MAY BE WITH DS1307 AND A CRYSTAL.
THE SQUEMATIC WOULD BE GREAT. I MADE IT LIKE A WATCH WITH A 3.7V BATTERY Li RECHARGABLE. OR MAY BE YOU SALE WITH THAT RTC.
I LOVE IT,
THANKS
mmenendez2 years ago
can you offer a schematic? do i need to program something or is it just plug and use it? thanks
mr monoply33 (author)  mmenendez2 years ago
The controller comes per-programed in the kit. It is pretty much a "plug and use it" setup.