Hi Dameri, maybe I didn't express myself correctly!dameri wrote: ↑Jul 10 2019 11:07amExcuse me for coming to this technical discussion. How does the driver's weight work? At least I sit in the saddle practically every time I cycle. So I don't push my pedal at full weight almost ever. And I think many others do the same when driving on an electric bike.fi7ippo wrote: ↑Jul 10 2019 5:48am
I am very happy that you like the idea, but I was thinking, and I believe that if it is not too much trouble, and there is enough memory space, the ideal would be to have two parameters that can be changed by the user:
1- User calibration weight available with an approximation of 0.1 or 0.5 kg (this is because it would be difficult for everyone to have an identical weight to be applied for the ADC reading);
The fact is that to calibrate the torque sensor (assuming it is now linear) we need at least 2 points. The first is the value at rest detected during power on, we must enter the second which apparently varies from sensor to sensor.
Now, we can perform an ADC reading with a defined weight applied to the crank (example 20 - 30kg), or, since it would not be easy for everyone to have the same calibration weight to apply at the crank to perform the second reading, we can have 2 parameters to configure, the weight applied during calibration and the ADC reading with applied weight! In this way, since a straight line passes only by two points each one would have its own sensor perfectly calibrated regardless of the weight used for calibration!
Yes thineight, essentially I do the same, the only trick is to apply the weight perpendicular to the crank to get an accurate reading. For me was difficult maintain the bike straight and firm with more than 25-30kg, I suggest you lock the bike firmly to something fixed or have someone help you keep the bike straight during the test.thineight wrote: ↑Jul 10 2019 12:16pm
Thanks for the effort and the new ideas guys! This project has now the right people onboard to obtain a great product!!
I will try to test the range of my torque sensor in the next days to see if it is linear or not..
Is it sufficient to have the bike on the ground (brakes activated) and apply the force on one pedal only with a luggage scale? Any better idea?
Thank You guys, see you soon!