How to calculate cadence using gyroscope/accelerometer with nrf52

RE: How to calculate cadence using gyroscope/accelerometer with nrf52

exman — Tue, 23 Jun 2020 15:34:19 GMT

powermeters are made with accelerometers that can be driven with coin cell batteries because they are low power and low voltage.

the cadence can be calculated from centrifugal acceleration,

but it needs a good algorithm to filter the shocks from the road and rider's leg on accelerometer and

remove the effect of gravity.

RE: How to calculate cadence using gyroscope/accelerometer with nrf52

bronsus — Wed, 17 Jun 2020 08:13:18 GMT

Hi am doing the same as you and I had the same problems. The status of my project now is that I can calculate the cadence from the values I got from the MPU6050 and send them via ANT+ to my Garmin Forerunner 735. Now I am implementing the HX711 to measure the strain gauges, This routine also works with some issues at the moment.

So if you are interested, send me an email and we can help us each other.

I also developed my own PCB...

RE: How to calculate cadence using gyroscope/accelerometer with nrf52

drewvigne — Thu, 16 Apr 2020 16:01:21 GMT

As a previous user has already mentioned this is probably not the best forum. However I am working on a similar project and can help you so why not.

there are many ways to measure cadence using a gyro/accel IMU. You could simply count the degrees per second using the gyro and convert to rpm for example. There are more accurate ways to do this using Euler angles. Check this research project out and you should be good to go:

https://csce.ucmss.com/cr/books/2018/LFS/CSREA2018/ESC3700.pdf

good luck

RE: How to calculate cadence using gyroscope/accelerometer with nrf52

awneil — Tue, 03 Mar 2020 16:49:00 GMT

[quote userid="84776" url="~/f/nordic-q-a/58622/how-to-calculate-cadence-using-gyroscope-accelerometer-with-nrf52/237865"]I googled many times about it, but i'm not found it.[/quote]

Go on: https://www.livescience.com/40064-cadence-sensors.html

[quote userid="84776" url="~/f/nordic-q-a/58622/how-to-calculate-cadence-using-gyroscope-accelerometer-with-nrf52/237865"]How can I do the capture motion without sensor[/quote]

by definition, a sensor is what translates an external physical thing into an electronic signal that an electronic system can process. So, yes - you need some sort of a "sensor".

There's a vast range of different "sensors" available which could fulfil this role; eg

a simple switch which clicks once per revolution
a rotational sensor on the axle
an accelerometer - which gives the acceleration of a point, eg on the crank arm
etc, etc, ...

RE: How to calculate cadence using gyroscope/accelerometer with nrf52

Laerte Junior — Tue, 03 Mar 2020 16:35:56 GMT

I googled many times about it, but i'm not found it. I was started study because I won a nrf52dk kit and I'm cyclist 🙂

The crank arm is a rotate part and need a sensor to capture this motion? How can I do the capture motion without sensor?

RE: How to calculate cadence using gyroscope/accelerometer with nrf52

awneil — Tue, 03 Mar 2020 14:52:48 GMT

This has nothing to do with ANT, BLE, or Nordic.

There are many articles on how to process sensor data to deduce things like cadence, steps, etc. Many of them are based on AI / ML.

You need to get googling ...