describe
Released by NeoGeo's NEO in "Make" magazine, I started to create my own Arduino power watches. Although the watch is very bored, I think there is too much GPS and compass in everyday use. On the contrary, I focused on making some things that have help me, not a hate. Although ordinary smart watches are cool, the price is too expensive, usually there is a customization. My goal is to make a watch between the small fitness tracker and a fully fully equipped smart watch. The Neopixel watch uses the data sent by the mobile phone, which can display any notifications, calls, and precise time. It also has a timer with stop / start / reset, the calibrated UV brightness meter, flashlight and automatic brightness function. Still in progress is an infrared remote control signal receiver and a transmitter, and music playback control on using buttons on the watch.
Function Demo Video
There are not many time recently, but I summarize the main functions of smart watches.
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Complete hardware
Ok, the watch is finally completed in hardware. Under the stimulation of the new part, I spent a weekend and weld all the things and bonded together. Never underestimate the value of high quality wires; 30AWG silicone insulated wire makes it easy to work more than one million times better than the old 26AWG PVC waste I used. I originally planned to use two-piece design, put Arduino, the battery, and the BL receiver on the bottom of the wrist and place the sensor and the lamp ring at the top. It turns out that I can install all components as one without affecting their thickness. The AdaFRuit USB charger module is covered by the strap when wearing. Tracking wires are very difficult because they are black, when I exchange the grounding and 5V USB wire, I almost destroyed Arduino, but the end result appeared very clean. The surface surface is made of 0.3 mm carbon. It is flexible, you can press anywhere on the right side to trigger the button. I used the black fabric strap instead of the elastic band, thereby well with the rest of the watch.
problem
Since my last post has passed for more than half a year, although this project has been attracting more attention, I have been working hard to end it. The first problem I encountered involved the board. The result of only 0.4 mm thick is very flexible. When wearing or handling, it is easy to be curved and caused by fracture of solder joints. On my two boards, I can completely assemble the first board, and then find poor connection, and before welding new pixel ring, I must first scrape off the second board. After assembling the entire battery pack + PCB + Arduino + Lux sensor + Neopixel ring and bonded together, it is almost impossible to discover the poor connection.
Another problem I have encountered is also a problem that I am very crazy. It is to try to integrate TV B-GONE functions into the watch. I will follow the Adafruit's TV-B-GONE guide as much as possible because the flock uses the same 32U4 chip as Trinket PRO, although the clock frequency is different. I played different resistors, voltages, infrared lights, but there is no effect. Even Ken Shirriff's excellent writing On the Arduino PWM register, the register introduces how to use the internal timer to output PWM in any desired frequency, PWM can not help me. I suspect that this may be related to the 12MHz clock speed. As far as I understand, the TV code stored in memory will be scaled in the clock frequency when retrieval. Since there is no real troubleshooting method (which can turn off the TV, you can not close the TV), I finally gave up, will use the space on the watch for the vibration motor. Yes, this is a simple way, but at this point, I need to complete the production of the watch, which makes me for a long time.
PCB
There are several ways to make disposable PCBs, but I use laser printer methods. HackaDay is actually a very good tutorial here. When I tried for the first time, I used sheep myndopia, but I was ironed onto the copper plate. I finally used magazine paper. There is no relationship on whether there is printing above because only the laser carbon powder is transferred to the board. With an iron, I have to press down for 5 minutes to clean the toner. The next step is the HCl + H2O2 solution to etch all remaining copper that is not covered by toner. My finished product is not perfect, so I have been plated with all the copper walking, and check it with a multimeter to ensure that all connections are intact. I think unless you need extremely low tolerances, the laser carbon powder PCB etching method is a quick and easy solution for DIY projects. The current split design of the watch is a good test for the software, but in fact, some improvements can be used in hardware. My goal is to significantly reduce the footprint and put the battery, board and new pixel ring on the wrist. The main challenge is to make the package thinner. To this end, I designed a circuit board to replace all messy wiring. This not only makes the watch thinner, but also reduces the possibility of the wires and breaks. The design also integrates TV B-GONE hardware in the upper right corner, I think this is a cool supplement. Since I didn't send it to board printing plants, I only use AutoCAD to create a simple double-sided design.
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Foreign sheet: Click to enter
Disclaimer: This article is translated by HackADay Authorized Circuit City, the original content of the circuit city, please indicate the source!
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