To read the first digit simply sum all the activated LEDs corresponding values in the first (left most) column. Do the same for the other digits from left to right. You have now read the time in BCD! If you apply more solder than needed and short chip pins clean the tip of your iron and reheat where its too much solder. The surface tension of the liquid solder should pull a small amount of it onto the iron. You may have to repeat this step a few times until all the excess solder is removed. Binary Coded Decimal as mentioned in the second step codes individual decimal digits as their own binary number. The main benefit in this case is how much easier it becomes to actually read the time. It's so much easier to read each time digit 2 (10), 3 (0011), 5 (101), 9 (1001), than reading the complete number at once 2359 (100100110111).

The primary requirement for the battery was the size. The battery needed to be small enough so that it could fit inside the watch enclosure without making it look bulky. I figured that the battery could not exceed 20mm × 35mm × 10mm. With these size constraints and the current requirement of 250mA my choice of batteries was limited to LiPo batteries. I found a "Turnigy nano-tech 300mAh 1S" battery on Hobbyking which I decided to use. The Charging IC Stretch the cloth using your hands and apply the double-side tape on the rectangle marked on the jeans. You might need the help of a friend to achieve this step. Don’t worry if the tape is larger than the rectangle, we will trim it later. Make sure to apply pressure to the tape to secure it firmly. Step 6 Mechanical: I redesigned the case and the the bezel with snap-fit features, obviating the need for fastening hardware and reducing the number of required parts. I also modified the PCB outline to include tabs that mechanically engage with features in the case, so the PCB is fully mechanically constrained (axially and rotationally) when the assembly is snap-fitted together. I also replaced the tactile switch with a right-angle switch (P/N 679-2400-ND from Digikey), and replaced the crown post with a captive pin (P/N 95648A320 from McMaster), where the flange of the pin gets sandwiched between the switch and the case to constrain it/keep it from falling out. This approach eliminates steps 2-5 from Step 13. While there are no real inherent advantages to owning a binary watch versus a traditional watch, they are still going to appeal to certain groups of people. I secured the watch PCB between a couple of prototype boards using tape. This ensured that the PCB did not move during soldering, which is very important. I then placed the soldering stencil over the PCB and used a generous amount of solder paste to cover all of the solder pads. I proceeded to use a thin pair of tweezers to place all of the components on their corresponding pads. I then used a heat gun to reflow solder all of the components in place.

Calculate unknown numbers using ones you already know

In this article we will answer that question and more. Additionally, we will show you several of our own personal recommendations in binary watches. So let’s start with that first question. Have you ever heard of binary watches? Images reminiscent of sci-fi films may come to mind upon hearing that term. Or perhaps instead you may think they are watches designed specifically for computer geeks. The latter may be closer to the truth. These types of watches do represent a more obscure, niche market within the watch industry. Now we know we don't have to explain the binary principle to a real geek, but for everyone else, here's a short explanation about how the Binary Wrist Watch works: This is definitely one of the more stylish binary watches. Because the display is rectangular, it blends in with the watch band, making it appear more like a men’s bracelet than a watch. Insert the hex nuts into their designated hex slots and keep them in place with a small piece of tape

If only the left one is lit you are over half way through the hour but probably not into the last quarter (or only just!). 10[…] = '32-47' mins This is kind of a typical layout for binary watches. You see that on the top row, both the 2 and the 1 are lit up. You would add 2+1 to get 3. On the second row, you see that the 16 and the 4 are lit up. Add 16+4 to get 20. So the time here would be 3:20. Pretty simple. An overview over what components and tools were used in this build. More on how the parts were selected in the next step. The first row of dots might represent 8, 4, 2, and 1. The second row might represent 32, 16, 8, 4, 2, and 1. You simply add the glowing dots together in each row to read the time. For instance, if the dot for 8 is lit up and the dot for 2 is lit up on the top row, you add these two together. The hour is 10. Then, add the dots together that are glowing in the second row. If 16 and 2 are lit up, the minute is 18. By adding the dots together, you know that the time is 10:18.You may be afraid that 20 seconds is not enough time to read the time in a binary format. To that I say 20 seconds is more than enough! I've used the watch daily for a week now and it takes maybe two seconds to read the time. If you do want a longer time then just go ahead and increase the variable that stores the amount of time before sleep. Although not having worn the watch in the presence of normal humans, I can already guarantee that now everyone will be able to easily identify me as a nerd. To turn on a single LED simply set the selected row number to high, and the other row to low, while setting the selected column to low and the other columns to high. This means the current is provided by the row goes through the LED, and sinks into the column number. Understanding the formula is easier than you might think. All watches use dots to represent the hour and the minutes. The dots will be lined up in either vertical or horizontal lines. If the lines are horizontal, the hour will have representative dots on the top line and minute dots on the bottom line. If the dots are vertical, the first row of dots will represent the hour and the second row will represent the minutes. Available in three bold metallic color tones and two LED colors, R75 is a beautifully designed, unique, high quality watch design.

Choose values according to LED color. I had success with the red LEDs with values between 39 ohm and 2k ohm I've always been fascinated by both interesting ways of telling the time and binary code. It's amazing the amount of information can be stored in simple ON/OFF signals. I knew I wanted a new wrist watch so why not combine binary code with a wrist watch, and do it as an awesome DIY project? There was no particular requirement for the charge controller except that it needed to be compatible with a 1S LiPo battery. I found the MCP73831T which is a fully integrated charge controller designed for single-cell charging applications. One of its features is the ability to adjust the charging current through an external resistor which I found rather useful in this application. LiPo Protection The watch body needed to be solid when put together, yet easy to open up for changing the battery or making modifications to the code. That would mean no glue where I could use something less permanent. In fact, the only glue used in this build was for the crystal glass.The rest of the time programming went into making the other modes as intuitive as possible. I figured that having the same button responsible for the same functionality across all modes would be the most intuitive. After some testing, this is the button configuration that I came up with: Binary watches can come in more complicated sequences if you desire something a little more in-depth. Some binary watches have a third row to represent the seconds. Well, look no further! Here's the perfect, geeky, and totally original, solution: The Binary Wrist Watch. It's attractively shaped, neat, whilst proudly showing off your geeky identity in a subtle yet distinctive way. Many binary watches will display the numbers beside the dots to aid you in decoding the time. More complicated combinations of numbers and dots are available if you want something a little more challenging to memorize. A format exists also where hours, minutes and seconds are shown on three lines instead of columns as binary numbers. [1] Binary time [ edit ]