High end Stromers are often problematic and getting help from the US distributor is a spotty thing. On forums like this one as well as the ebike forum on mtbr (skip the bs ebike hate posts, which are plenty), you learn things: Like R&M with the Rohloff electronic shifter leaks hub oil. Here's an E7000 motor failure with pics: Their new EP8 motor has quality control problems as well and the turnaround time for warranty replacement is a joke: Less waste ,better place.īreakdowns at only 100km is ridiculous and totally unsat. We need to start fixing and repairing instead of discarding. Kind of ridiculous.Īlso with everyone complaining about climate change and the huge amount of waste that gets discarded would it not be better to be able to repair these things instead of having to throw the whole thing in the garbage just because of one small defective part. Just think if you went out a bought a new car and you had engine problems and you find out that the car manufacturers do not make replacement parts for your car. These companies who are producing these should be following up with replacement parts. So for those that are looking at E-bikes and it comes equipped with a Shimano motor be prepared for the extra expense of fixing it if you have motor problems. You will have to go out and buy a complete motor at a higher expense then it would be to just buy a part for the motor like you can for a Bafang or a Bosch. What he is getting at is that, if you own a Shimano motor, and it breaks you will not be able to buy parts for it to fix it. He is not complaining that his bike broke down. *Example sketch to control a stepper motor with A4988 stepper motor driver and Arduino without a library.I totally get what Anton.somora is saying. You can copy the code by clicking on the button in the top right corner of the code field. This sketch controls both the speed, the number of revolutions, and the spinning direction of the stepper motor. I like these assortment boxes from Amazon, this way I always have some capacitors of the right size on hand. Pololu suggests a capacitor of 47 ♟ or more (I used a 100 ♟ capacitor). To protect the driver you can connect an electrolytic capacitor between VMOT and GND. The A4988 carrier board uses low-ESR ceramic capacitors, which makes it susceptible to destructive LC voltage spikes, especially when using power leads longer than a few inches. Normally I would use 1/8 or 1/16 microstepping and connect the appropriate pins to 5V (see the table in the introduction). This makes explaining the code a bit easier. In the rest of this tutorial I have left MS1, MS2 and MS3 disconnected, so the driver operates in full-step mode. When this pin is set high the driver is disabled. The EN (enable) pin can be left disconnected, it is pulled low by default.If you are not using the pin, you can connect it to the adjacent SLP/SLEEP pin to bring it high and enable the driver. When pulled low, all STEP inputs are ignored until you pull it high. Meaning, pulling this pin low puts the driver in sleep mode, minimizing the power consumption. You can choose a different digital pin if you want, but these are the ones I used for this tutorial and the example code. The STP (step) and DIR (direction) pin are connected to digital pin 3 and 2 respectively.The GND pin (lower right) is connected to the ground pin of the microcontroller and VDD is connected to 5V. The two coils of the stepper motor are connected to 1A, 1B and 2A, 2B (see below).
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