Since the Ramps board does not support program-controlled microstep mode switching, the motors will only ever run at the 1/32 microstep rate you have configured (both physically and in Config.h) so that means your desire for _DRIVER_MICROSTEPS_GOTO 8 will not be effective. Since the Atmega is such a slow processor, OnStep can't pulse the STEP line fast enough to make the motors go any faster in 1/32 mode than what you are seeing now.
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On 2021-04-21 1:25 a.m., Marius Ungureanu via groups.io wrote: Hello,
I have just started motorizing my mount on it’s RA axis but i am getting verry slow speeds.
I use Ramps 1.4 with DRV8825 DRIVER and ML17A3 motor.
I have set the jumpers to 32 microsteps
I use a 20t pulley on my motor and 60t on the telescope mount (so 3:1 ratio), the mount has a further reduction of 100:1 on it’s worm pulley.
Could you have a look? Am i doing something wrong? I get verry slow speed on tracking.
// TRACKING BEHAVIOUR -------------------------------------------- see https://onstep.groups.io/g/main/wiki/6-Configuration#TRACKING <https://onstep.groups.io/g/main/wiki/6-Configuration#TRACKING>
#define TRACK_AUTOSTART ON // OFF, ON Start with tracking enabled. Option
#define TRACK_REFRACTION_RATE_DEFAULT OFF // OFF, ON Start w/atmospheric refract. compensation (RA axis/Eq mounts only.) Option
#define TRACK_BACKLASH_RATE 25 // 25, n. Where n=2..50 (x sidereal rate) during backlash takeup. Option
// Too fast motors stall/gears slam or too slow and sluggish in backlash.
// SYNCING BEHAVIOUR ----------------------------------------------
see https://onstep.groups.io/g/main/wiki/6-Configuration#SYNCING <https://onstep.groups.io/g/main/wiki/6-Configuration#SYNCING>
#define SYNC_CURRENT_PIER_SIDE_ONLY ON // ON, Disables ability of sync to change pier side, for GEM mounts. Option
// SLEWING BEHAVIOUR ----------------------------------------------
see https://onstep.groups.io/g/main/wiki/6-Configuration#SLEWING <https://onstep.groups.io/g/main/wiki/6-Configuration#SLEWING>
#define SLEW_RATE_BASE_DESIRED 2 // 1.0, n. Desired slew rate in deg/sec. Adjustable at run-time from <-Req'd
// 1/2 to 2x this rate, and as MCU performace considerations require.
#define SLEW_RATE_MEMORY OFF // OFF, ON Remembers rates set across power cycles. Option
#define SLEW_ACCELERATION_DIST 5.0 // 5.0, n, (degrees.) Approx. distance for acceleration (and deceleration.) Adjust
#define SLEW_RAPID_STOP_DIST 2.5 // 2.0, n, (degrees.) Approx. distance required to stop when a slew Adjust
// is aborted or a limit is exceeded.
#define MFLIP_SKIP_HOME OFF // OFF, ON Goto directly to the destination without visiting home position. Option
#define MFLIP_PAUSE_HOME_MEMORY OFF // OFF, ON Remember meridian flip pause at home setting across power cycles. Option
#define MFLIP_AUTOMATIC_MEMORY OFF // OFF, ON Remember automatic meridian flip setting across power cycles. Option
// PARKING BEHAVIOUR ----------------------------------------------
see https://onstep.groups.io/g/main/wiki/6-Configuration#PARKING <https://onstep.groups.io/g/main/wiki/6-Configuration#PARKING>
#define STRICT_PARKING OFF // OFF, ON Un-parking is only allowed if successfully parked. Option
// MOTION CONTROL --------------------------------------------------
see https://onstep.groups.io/g/main/wiki/6-Configuration#MOTION <https://onstep.groups.io/g/main/wiki/6-Configuration#MOTION>
#define STEP_WAVE_FORM PULSE // SQUARE, PULSE Step signal wave form faster rates. SQUARE best signal integrity. Adjust
// Stepper driver models (also see ~/OnStep/src/sd_drivers/Models.h for additional infrequently used models and more info.):
// A4988, DRV8825, LV8729, S109, SSS TMC2209*, TMC2130* **, and TMC5160* ***
// * = add _QUIET (stealthChop tracking) for example "TMC2130_QUIET"
// ** = SSS TMC2130 if you choose to set stepper driver current (in mA) set Vref pot. 2.5V instead of by motor current as usual.
// *** = SSS TMC5160 you must set stepper driver current (in mA) w/ #define AXISn_TMC_IRUN (IHOLD, etc.)
// AXIS1 RA/AZM
// see https://onstep.groups.io/g/main/wiki/6-Configuration#AXIS1 <https://onstep.groups.io/g/main/wiki/6-Configuration#AXIS1>
#define AXIS1_STEPS_PER_DEGREE 10666.66667 // 12800, n. Number of steps per degree: <-Req'd
// n = (stepper_steps * micro_steps * overall_gear_reduction)/360.0
#define AXIS1_STEPS_PER_WORMROT 38400 // 12800, n. Number of steps per worm rotation (PEC Eq mode only:) <-Req'd
// n = (AXIS1_STEPS_PER_DEGREE*360)/reduction_final_stage
#define AXIS1_DRIVER_MODEL DRV8825 // OFF, (See above.) Stepper driver model. <-Often
#define AXIS1_DRIVER_MICROSTEPS 32 // OFF, n. Microstep mode when tracking. <-Often
#define AXIS1_DRIVER_MICROSTEPS_GOTO 8 // OFF, n. Microstep mode used during gotos. Option
#define AXIS1_DRIVER_IHOLD OFF // OFF, n, (mA.) Current during standstill. OFF uses IRUN/2.0 Option
#define AXIS1_DRIVER_IRUN OFF // OFF, n, (mA.) Current during tracking, appropriate for stepper/driver/etc. Option
#define AXIS1_DRIVER_IGOTO OFF // OFF, n, (mA.) Current during slews. OFF uses same as IRUN. Option
#define AXIS1_DRIVER_REVERSE OFF // OFF, ON Reverses movement direction, or reverse wiring instead to correct. <-Often
#define AXIS1_DRIVER_STATUS OFF // OFF, TMC_SPI, HIGH, or LOW. Polling for driver status info/fault detection. Option
#define AXIS1_LIMIT_UNDER_POLE 180 // 180, n. Where n=150..180 (degrees.) Max HA hour angle + or - for Eq modes. Adjust
#define AXIS1_LIMIT_MAXAZM 360 // 360, n. Where n=180..360 (degrees.) Max Azimuth + or - for AltAzm mode only. Adjust
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