How do bike computer speedometers work?
A bicycle speedometer is composed of a microcontroller, an lcd display, a battery and a reed switch. The battery supplies a small voltage (current limited) to one side of the reed switch and to an interrupt input of the microcontroller. The other end of the reed switch is connected to the negative of the battery (i.e. 0 volts). When the spoke mounted magnet passes the reed switch, the reed contacts close, thus the interrupt input is at 0 volts for an instant. The microcontroller’s program stops whatever it was doing, and services the interrupt, setting a flag to notify the main program to start a timer. A debounce code section filters out the multiple switch bounces all mechanical switches have. After a full wheel rotation, a second interrupt occurs, and the program calculates the time from the first interrupt to the second interrupt. The microcontroller knows the circumference of your wheel, because you entered that value into memory. The microcontroller performs the conversion from meters/second to mph or kph, and displays the result on the lcd. The speedometer also keeps track of distance traveled, which is just the sum of all the wheel revolutions times the circumference, converted to miles or kilometers.
How do you program a bike computer?
I already have the manual in hard copy. I just don't understand it. Only one small section is written in plain English. It's all written in Western European.
How do you program schwinn sc8 bike computer?
If it is the old one with a single button on the top then here it goes: There is a tiny reset button on the back, press and hold until display starts flashing (probably need a paperclip as it is recessed and small, the display will start cycling thru all the numbers & functions). When this happens tap the button on the top of the computer. What should now be flashing is the speed unit (kph). Press the button on top of the computer to get the desired unit, then press and hold down the button so it moves to the tire circumfirence setting. Tap the button on top to change the digit, press and hold to move to the next number. Once the tire size is set (should be four digits if I remember right), tap the reset button on the back. This should now finish programming the computer. To set the time, use the button on top to move to the clock, then tap the button on the back. The first number of the time should be flashing. Tap the top button to set it, press and hold to move to the next number. Once the time is set, tap the reset button to finish. If you do not know the 4 digit number to input for your tire size, go here, and look for the number corresponding to your tire size. The number listed should be pretty close to what you need. The computer you want is the astrale 8 as it uses a 4 digit code. http://www.cateye.com/en/tech_support/ma...
Will a bike computer work on an indoor trainer?
It will work, but you have to install the sensor on the rear wheel, the only one that spins. The wireless computers sometimes don't get the signal from the back, so get a wired one. A cheap one will work but get one with cadence counter. That is a very important tool for your training. It will tell you cadence, current speed, average speed speed, max speed, distance for the ride, distance for the week, total distance (odo), and time. I use a cateye. since there are two sensor, one for the wheel and one for the crank, you may want to see if the shop will install it for free or a small fee. If you don't have a trainer yet, I recommend the Kinetic by Kurt fluid. It mimics going in a slight incline. I paid less than that at my local bike shop. http://www.bikesdirect.com/products/wind...
Just got bike 'computer'. Wire is to short. Can I cut it and extend, with heavier wire, to desired length? ?
Usually these have loads of extra wire that needs wrapping around the fork to keep it from getting caught up in the spokes. Have you placed the sensor on the front wheel? But yes you should be able to chop it and extend the wire, however I would suggest using a wire with similar gauge and also adding only the length you need. The pulse from the magnet on the wheel creates only a very small voltage and any additional wire can reduce how well the computer receives the signal, possibly giving incorrect readings. Make sure you wrap up the wires with some good electrical tape so they don't get dirt and water in there.
How do you run 17v computer speakers with a battery?
Use a power inverter. This device converts 12 volt DC power to 120 volt AC power. Then simply plug the Dell computer speakers into the 120 volt AC outlet on the power inverter. Just make sure that you get a power inverter with enough output to power the speakers. However if this is a pedal bicycle forget it. The little dynamo that is commonly used to power a headlight does not have anywhere near the output capacity to power these speakers. You would ned to install a 12 volt car battery which would be way too cumbersome for a bicycle.
Is there extra value to own a bike computer like Wahoo ELEMNT or Garmin Edge if I already have a Garmin Fenix 2?
Yes. The Garmin Edge 800/810/1000 and Wahoo ELEMNT can give you maps with turn by turn directions. That means less time being lost when you’re farther from home. Those Garmins can also navigate to points of interest like drinking water and bike shops when you have problems on longer rides.You get more data too. For example, on long rides I use a screen withSpeed, for estimated times.Power, for pacing harder efforts. It responds instantly and doesn’t lag like heart rate. Over-doing it with over 100 miles to go would be bad. Riding faster up hill when it feels tough but that’s just fatigue can be a fine idea.Heart rate, for pacing long aerobic efforts because my heart rate at VT1/AeT doesn’t change with training like power does. Changes in the relationship between power and heart rate can also indicate problems.Cadence. If it’s looking low I might bring smaller gears next time.Distance, which lets me know how far I have to go can be correlated with a printed cue sheet if the GPS gets flaky.Elapsed time so I remember to eat every hour.Next navigation point. This indicates how important watching the distance count down is. The next of many wiggles on Mines Road is unimportant, although the left turn on Tesla after 50 miles without civilization is significant.Distance to next course point and type. It’d be bad to miss the only water for the next 1–2 hours. Missing turns is less likely when there’s advance warning.
"Discovery Channel" Bike Speedometer Help?
bike computers usually have a small 'set' button on the back that is used to put the computer into setup mode. It's very small and must be pushed with something like a toothpick or a pencil point. You have two buttons on the front, so one button is probably to advance numbers on the display and one is to move to the next field. Without knowing exactly which button does what, just use trial and error until you get it figured out, then worry about setting it correctly. Without specific knowledge of that computer, that's about all I can offer except to say that many weird-brand computers are actually Vetta brand with different colors. You might look at the Vetta website to see if their instructions work for your computer. http://www.vetta.com/Product_Computer_ma... Most bike computers accept the wheel circumference in mm (if 4 digits) or cm (if 3 digits.) So a 23x700 wheel might be somewhere around 1880/188 in circumference. The best way to determine the correct number to enter is to do a 'roll-out.' Roll the wheel along the ground 3 revolutions, measure the distance with a tape measure, and divide by 3. That gives a good reading for circumference. If your tape measure is in inches, convert to metric by multiplying inches by 25.4 to get mm.