![]() ![]() It's just a few closeup tracking passes with my developing rig. I hope my explaning is comprehensible and helpfull. You can try to limit more the max current (turn the limit to lower value, up to 150 mA), use a higher power supply (you can use up to 30 V) or use a other model of stepper motor. The motor make a big step not a small eighth step (aproximatly a half step). This value are not the current of the motor. The first eighth step are 140 mA and 735mA. The limit of the driver is set to 750 mA. If the stepper motor is a motor with a highter resistence (20 ohm or more) the Alegro A3967 cannot limit the current in the windings to make a eighth step bycause the current is limiting by the resistece of the motor winding not by the chopper function of the driver.Įxample: The max current of a 50 ohm motor on 12 V is 240 mA. When you look 2 windings: the current is sequential: 100%-0%, 92-38, 70-70, 38-92, 0-100 of Imax (setting point with the adj pontentiopmeter on Easydrive) In this way the rotor make steps between half steps.Įighth step or more: the motor current is modulated by the driver in a bigger number of steps. Quarter step It is used a limiting the current of the motor by the chopper mode of the driver. In both case (full and half steps) the current can are limitated to the winding resistance. This make that the rotor rotate a half step. Half step: between 2 full steps is a half step who is given current to only one winding. To undestand it you must undestand the theory of microsteps and the Allegro A3967.įull Step: everytime 2 winding of the stepper motor are on. Hi have a problem that his Stepper motor not make microsteps but only big full steps. Serial.println( " > " ) for (i = 0 i < 4000 i ++ ) // Iterate for 4000 microsteps. For all the product details visit // For the full tutorial visit // int dirpin = 3 ĭigitalWrite(dirpin, LOW) // Set the direction. // Inpired by the code and chat on this thread. ![]()
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