Mega Mount for a Bicycle

thingiverse

People with chronic computer addiction often struggle with fitness. I found myself spending too much time sitting on my bum, not getting enough basic exercise. My son handed me his bicycle, so I bought a bike stand with built-in magnetic resistance (I chose one that provided a replacement axle bolt as well, matching the wheel nuts exactly).\nI had a Mega2560 with a 3.2 Sainsmart Touch Display at my disposal, so I rigged up this bicycle computer to monitor my effort. The added circuitry is extremely simple, requiring only two wires to the reed switch. A moderate distance twice a day is very beneficial to circulation in my lower legs and gets into the aerobic range as well.\nThe printed objects, the Mega mount and the reed switch mount, are straightforward efforts but do the job and may inspire others to improve the designs. I used a proprietary reed switch mounted in a holder, along with the magnet on the spokes that came with it. I had put these aside from a commercial bicycle computer a few years ago. If you don't have these, then adding an extra hole to the reed switch mount for a standard mini magnetic reed switch is a good option.\nThe Arduino program is also pretty basic but proves the principle and I am looking to improve it to make my exercises more interesting. Please use the UTFT library mentioned in the Arduino program. It works! My long-term goal would be to use the computer to control the magnetic resistance system built into the bike stand, changing the effort required automatically or randomly to simulate hills etc\nIf this was to be mounted on a road bike and used for real riding through the countryside, I imagine the whole thing would need to be reinforced and possibly even have a waterproof cover. This project should not be categorized as "Sport and Outdoors," anyway have fun!\nPost-Printing\nExtra Info\n I held the Arduino Mega board directly onto the plastic mount using small self-tapping screws. A thin elastic cord was used to tie the mount onto the handlebars and yoke (see the two center holes). This works fine for a stationary exercise bicycle, but would need significant improvement for a bicycle on the roads or tracks.\nI used a three-prong header that had the connectors bent to a right angle. That way connections could be made to pins 21 and 19 without hitting the display board above it.\nA small vertical hole was provided for the reed switch.\nDouble-sided foam tape (mine was white) was used to secure the reed relay, preventing it from twisting or slipping around (for example into the spokes!!).