Bike light interferes with computer

[Tristand]

The problem is coming from the light.

It is either caused by the DC-to-DC converter or the PWM power driver.

Either way, throw it out because it is probably going to cause even more

problems like with indoor trainers, cell phones, etc. 

 

PS. Clearly is NOT CE compliant.

[thisismyotherbike]

I'd still like to know the brand and model of the light.

[Rocket-Boy]

Contrary to what you eye sees, the light is flashing at a very high duty cycle (on-off). The electronics doing this is probably causing RF interference with the wireless comms between speed sensor and bikeputer.  It's likely the light unit doesn't have EMI suppression.

 

You can confirm by wrapping the light in foil (just a temporary means of confirming). it will help suppress the EMI, and your bikeputer should work normally or close enough.

 

Successful resolution can require some invasive soldering to the electronics controlling the light, suppression coils around the power leads, or replacement with a unit that complies with FCC/CE/ICASA  EMI regulations.

 

Brand of light?

I used to enjoy the days when video was shot with fluorescent lighting due to the lower cyclic rate and how it would cause the stroboscopic effect on car wheels.

[Capricorn]

I used to enjoy the days when video was shot with fluorescent lighting due to the lower cyclic rate and how it would cause the stroboscopic effect on car wheels.

you can relive your youth twirling a pen with fluorescent lighting as background. same effect. also makes the pen look somewhat bendy

[Jensie]

Cheapest way to get past this get a wired cycle computer or Bryton 10e (R660).

 

https://en.ciclimattio.com/s/bryton/rider-10e-2018/?id=21740

[Capricorn]

Cheapest way to get past this get a wired cycle computer or Bryton 10e (R660).

 

https://en.ciclimattio.com/s/bryton/rider-10e-2018/?id=21740

 

it depends if the cable is shielded or properly protected against EMI. The EM field generated by the light or its battery can induced currents in the wire from the speed sensor to the head unit as well. While the interference might not be as disruptive as it is to a wireless setup, it can generate misleading data.

 

But the focus should be on CE/FCC/ICASA compliance wrt EMI. Then none of these issues should occur (assuming a suppression circuit/component hasn't failed.)