# How would you measure rower / rowing machine sensor output?

#### Crashcup

Joined Oct 11, 2017
17

#### AnalogKid

Joined Aug 1, 2013
8,226
The stock monitor does have calories displayed. I doubt it's very accurate, but I suppose they could roughly estimate effort based on the speed of the resistance wheel. Higher speed = higher effort, and they could have a lookup or an equation in the software to estimate force on the chain for any given wheel speed.
My old Nordic Trak has the same thing. Pretty much useless.

#### pmd34

Joined Feb 22, 2014
499
Hi Keith, without a scope....
You could connect a multi-meter to the sensor and potentially you may see a voltage dependent on the speed at which the sensor gets repeatedly triggered, it sort of assumes that the existing electronics after the sensor is putting a load on it so its not a dead certainty. You can as I say also try using a 5mm LED with a series resistor of say 1k..this will limit the current the LED can take, so should be safe and not over power anything.