DIY Dyno (Dynamometer): Part 2 - Sensors

This is Part 2 of DIY Dyno. This video looks at using earbuds as sensors to measure the RPM of both the motor and the inertia device which in this design is a pair of brake rotors. This video looks at selecting earbuds, the wiring, mounting and testing. An input protection circuit is built and tested to prevent damage to the laptop's mic/line input.
DIY Dyno (Dynamometer): Part 1 - Mechanical
• DIY Dyno (Dynamometer)...
DIY Dyno (Dynamometer): Part 2 - Sensors
• DIY Dyno (Dynamometer)...
DIY Dyno (Dynamometer): Part 3 - Software
• DIY Dyno (Dynamometer)...
DIY Dyno (Dynamometer): Part 4 - Proof of Concept
• DIY Dyno (Dynamometer)...
DIY Dyno (Dynamometer): Part 5 - Moment of Inertia
• DIY Dyno (Dynamometer)...
DIY Dyno (Dynamometer): Part 6 - Gear Ratios vs. MoI
• DIY Dyno (Dynamometer)...
DIY dyno (Dynamometer): Part 7 - More Testing
• DIY dyno (Dynamometer)...
DIY dyno (Dynamometer): Part 8 - Moving Forward
• DIY Dyno (Dynamometer)...

[@glennedward2201]

Ear buds don’t work as a load sensor. Thats good for RPM signals only.
You still need a load sensor or a rotary torque sensor.

[@blanchae]

Good point

[@ralger]

Nice dual trace scope, I'm jealous ☺

[@blanchae]

Unfortunately, not mine, I borrowed it from my friend Paul

[@ralger]

@@blanchae and here I thought something I could borrow 😉

[@zakhsq4274]

hi, i am trying to use my earphones as a sensor but in my laptop there is only the port for earphones with 4 rings. Do you know if I have to buy a microphone adapter or is there some way to fix it, thanks.

[@blanchae]

You can buy a microphone adapter. They are inexpensive.

[@hustlaz2k]

hi... can we use hall sensor instead of earphone?

[@blanchae]

Hall sensor should work better. Just need to build a circuit that works with it.