Hey guys
I'm a beginner working with arduino and have finished just a few tutorial/sensor projects,... So far i am having a lot of fun.
While sitting on my oldtimer spinningbike, i thought of replacing its old cyclometer, but actually don't have the slightest clue, how, and if it is even possible to realize to access signal.
Yellow cables are sensor input
This is the board which is connected to everything (e.g.powersupply, LCD, and sensor input)
Sensor input is a stereo/phonejack.
Cyclometer only shows speed, distance (guess is is calculate), and time.
Do you think, that it is possible at all to build my own?
Yes, sensor type is the key. Many of the old cyclometers (and new ones for all I know) used a reed switch picking up from a magnet on the wheel. These days a Hall Effect switch would be better.
Reed switches are very prone to bouncing which has to be "debounced" but Hall devices don't suffer from this. Very low cost devices (A3144 IIRC?) have 3 wires, + - and a logic signal, go straight into Arduino logic pin.
The device is still in "pristine" condiition, but it looks a bit chunky. That's the only reason i want to replace it.
Its only a guess, but i think it is a reed switch.
I did have a Look into the manual, unfortunately IT is in german, and i am Not able to find Information in there.
If any of you is familiär with german, here's a link.
I'd have to Look at the flywheel, to see if it is hull or reed?
Close up images, more than just the PCB please... definitely the sensor. But you will have to make electrical measurements too. Are you comfortable with that? Have the equipment?
Once we can identify the sensor, youll need to characterise the input stream of pulses.
Number of pulses per revolution, outer diameter of the wheel etc.
