Yes, now we do carry this super cool and huge watch kit. It comes in lose part and soldering is necessary. The Big-time watch kit is a geekishly stylish digital watch with a Velcro watch-band and a slick acrylic enclosure. The heart of the kit is the much venerated ATMega328 using a 32kHz clock-source to keep time. To check the time, just press the button on the side of the watch and it pops up on a 4-digit 7-segment LED display. Thanks to some low-level hackery, the ATMega is running at super low power and should get an estimated 2 years of run time on a single CR2032 coin cell!
The Big Time is a through-hole kit with a low parts-count, so it makes a great project for beginning solderers. After you’ve finished soldering together the component and PCB, simply stack the acrylic pieces around it and screw them together with the included hex-head screws. Once that’s done, pop in the coin-cell battery and go show off your nerd bling!
This watch kit is super hackable. Arduino Bootloader compatible pins are broken out to the side of the board and the watch-firmware is running on top of a Arduino bootloader! This means that all you need to do to add your own code is to open up Arduino or Wiring and select “Arduino Pro or Pro Mini 3.3V/8MHz w/ ATmega328” as your board.
1 x Pre-programmed ATMega328 DIP IC
1 x 4-Digit 7-Segment Display
1 x 32kHz Crystal
1 x 10kOhm Resistor
2 x 0.1uF Capacitors
1 x Right Angle Tactile Button
1 x 20mm Coin Cell Battery Holder
1 x 20mm Coin Cell Battery
4 x 4-40 Screws
1 x Allen Wrench
1 x Velcro Watch Band
Acrylic Enclosure Parts
Simple Assembly Guide
Big Time Watch Kit
-No software require
Big Time Watch Kit Assembly Guide
1st step: Solder the ATMega 328 chip
Actually we need to solder the ATMega chip first, but I forget in the early stage. But it is ok as long as all component are solder in that board with correct direction.
So when you insert the ATMega chip please be caution that you don’t reverse the chip. Pin 1 of Atmega should be on the right side of PCB.
Ensure the orientation is correct and insert it into PCB. You might need to bend the pin a bit to fit into the PCB. Please solder with care cause the pin are close to each other.
2nd step: Solder the capacitor and resistor
There are 2 capacitors and 1 resistor to be soldered in those slot. There are no polarity concern for capacitor and resistor. Feel free to solder in any orientation you like as long as it get into correct pads.
3rd step: 7 Segment
OK, this step is quite important and please make sure you follow exactly the explanation. The orientation of 7 segment should not be reverse else you will have a faulty clock and it cannot be fixed as de-soldering require skill.
Please do take note that the 4 dot (point) of 7 segment should be at the bottom, match it with the display on the board and you will get the correct orientation.
4th step: Battery Socket
Solder some lead in the middle pad like in page 8 of the instruction manual to enable battery touches the pad easily when insert in the slot
Next is to solder the battery socket/holder, Make sure the opening (where battery is being inserted) of socket facing bottom. Solder the other 4 leads.
5th step: Push button and Crystal
Push Button and Crystal. The Crystal is 32.768KHz and this is popular crystal for Real Time Clock.
The crystal and push button should be insert and solder at the location shown in the picture.
The real component picture and location is as below:
6th step: Remove Component Lead
The remaining lead of component should be cut since to make your project tidy and also to avoid any unnecessary short.
Before cutting the extra leads.
After cutting the extra lead 🙂 Nice! Make sure the lead of Atmega328 and push button being cut too as we want to level the PCB board nicely into the Acrylic enclosure.
7th step: Remove Acrylic Protection Plastic
There are 5 pieces of the Acrylic enclosure. The 5th part is the smallest acrylic which is for user to press the push button on PCB after it is enclosed.
Remove the protective cover
And this is what it will look like when the protection cover is removed.
8th step: Putting everything together 🙂
The last part of the project. Assembler the enclosure together according to the picture provided in the instruction manual page 15.
It should look like as below:
If you are comfortable with the enclosure, insert the velcro cable.
Please try the length required by wearing it on your hand and adjust before you screw it.
Screw all the 4 nuts. Screw from top to bottom cause you don’t want your hand to feel the nut cap when you wear the watch.
Let look at the sample below
Now you can wear the watch and go anyplace you want.
TO SET THE TIME
Hold down the button until you see the colons blink.
Continuing to hold the button will increase the value.
PROBLEM MAY OCCUR
Please solder the component at the slot prepare, if the lead connected 2 pads it will create short circuit.
When cut the wire at the backside please make sure that it is shot enough to close the other lit or you wont able to screw the enclose pass through it.