Modding the 5v version of the $1.60 28BYJ-48 for the more powerful bipolar mode is easy, and allows on to use current-regulated Pololu A4988 Stepper Motor Driver modules. https://www.youtube.com/watch?v=jHLyJbNgcDo
The Pi's are one of the few things that break that old triangle."Fast, good or cheap. Choose two"
Have not tried that, probably worth trying if the weight of the bot can be kept low.Modding the 5v version of the $1.60 28BYJ-48 for the more powerful bipolar mode is easy,
Gavinmc42 wrote: ↑Sun Feb 24, 2019 1:52 amDC brush motors have a mechanical clutch
DC motors with good gearboxes and a tacho (magnetic or opto) sensor
Sumo bots have very sticky wheel treads and low duro rubber tires
A new way of compensating is with motion sensors, optical mouse type positioning.
I hate DC motor gear noise and I'm looking at magnetic gearboxes.
I have seen those FPV/Drone camera gimbal motor start being used now.
3 phase steppers, drone motors, controllers for speed control and not positioning control.
Simonyeee wrote: ↑Sat Feb 23, 2019 9:13 amThe robot should be able to drive really straight, so sometimes it has to travel 1 meter and should stay on the exact line and not change its orientation. It should also be able to do this if there is more weight on one wheel, because of an uneven ground. If possible it should also be affordable.
Gavinmc42 wrote: ↑Tue Mar 12, 2019 12:50 am1. Pixart robot vacuum navigation, optical mouse sensor, help bot suck in straight lines
2. gyros had a motor and a big spinning wheel.
3. Accelerometers size of single serve baked beans cans.
4. An IMU as accurate as the 6050 was only on Nuclear submarines or later on cruise missiles?
tlfong01 wrote: ↑Tue Mar 12, 2019 2:31 pmNext is to write a python program to do more tests.
Reading data from the MPU-6050 on the Raspberry Pi (using python) - BitiFly 2013nov07
http://blog.bitify.co.uk/2013/11/readin ... berry.html