Arduino - poznámky
Z Hujer.Net
- A4988 A4988
- TMC2100
- DRV8825
Pro převodovku s poměrem 3.71 : 1 plus kola 54 zubů / 16 zubů
// Axis1 is for RA/Az
#define StepsPerDegreeAxis1 15359.4 // calculated as : stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
// NEMA17 + PLANET : 200 * 16 * 3.71*54/16 * 138/360 = 15359.4
// Axis2 is for Dec/Alt
#define StepsPerDegreeAxis2 9794.4 // calculated as : stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
// NEMA17 + PLANET : 2000 * 16 * 3.71*54/16 * 88/360 = 9794.4
// PEC, number of steps for a complete worm rotation (in RA), (StepsPerDegreeAxis1*360)/gear_reduction2. Ignored on Alt/Azm mounts.
#define StepsPerWormRotationAxis1 40068L
// NEMA17 + PLANET : (15359*360)/138 = 40068L
Pro převodovku 5+2/11 :1 RA kola 55 zubů / 16 zubů a DE kola 54 zubů / 16 zubů
// Axis1 is for RA/Az
#define StepsPerDegreeAxis1 21850.0 // calculated as : stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
// My NEMA 17 : 200 * 16 * (5+2/11) * 55/16 * 138/360 = 21850.0
// Axis2 is for Dec/Alt
#define StepsPerDegreeAxis2 13680.0 // calculated as : stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
// My NEMA 17 : 200 * 16 * (5+2/11) * 54/16 * 88/360 = 13680.0
// PEC, number of steps for a complete worm rotation (in RA), (StepsPerDegreeAxis1*360)/gear_reduction2. Ignored on Alt/Azm mounts.
#define StepsPerWormRotationAxis1 57000L
// My 16m step : (21850*360)/138= 57000
Přímé spojení kola 54 zubů / 16 zubů
// Axis1 is for RA/Az
#define StepsPerDegreeAxis1 4140.00000 // calculated as : stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
// My NEMA 17 : 200 * 16 * 54/16 * 138/360 = 4140.00000
// Axis2 is for Dec/Alt
#define StepsPerDegreeAxis2 2640.00000// calculated as : stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
// My NEMA 17 : 200 * 16 * 54/16 * 88/360 = 2640.00000
// PEC, number of steps for a complete worm rotation (in RA), (StepsPerDegreeAxis1*360)/gear_reduction2. Ignored on Alt/Azm mounts.
#define StepsPerWormRotationAxis1 10800L
// My 16m step : (4140*360)/138= 10800
Upřesněné převody šneku 138:1 a 88 : 1 Kola 49 zubů / 16 zubů
#define StepsPerDegreeAxis1 3756.66667 // calculated as : stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
// My NEMA 17 : 200 * 16 * 49/16 * 138/360 = 3756,66667
// Axis2 is for Dec/Alt
#define StepsPerDegreeAxis2 2395.55556 // calculated as : stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
// My NEMA 17 : 200 * 16 * 49/16 * 88/360 = 2395,55556
// the EM10b has two spur gears that drive the RA/Dec worms, they give an additional 1.25:1 reduction
// in addition to the 18:1 gear heads on the steppers for a 22.5:1 final ratio before the worm/wheels at 144:1
// PEC, number of steps for a complete worm rotation (in RA), (StepsPerDegreeAxis1*360)/gear_reduction2. Ignored on Alt/Azm mounts.
#define StepsPerWormRotationAxis1 9800L
// My 16m step : (3757*360)/138= 9800
Původní odhadované převody šneků RA 144 DE 72
#define StepsPerDegreeAxis1 3920.0 // calculated as : stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
// My NEMA 17 : 200 * 16 * 49/16 * 144/360 = 3920
#define StepsPerDegreeAxis2 1960.0 // calculated as : stepper_steps * micro_steps * gear_reduction1 * (gear_reduction2/360)
// My NEMA 17 : 200 * 16 * 49/16 * 72/360 = 1960
#define StepsPerWormRotationAxis1 9800
// My 16m step : (3920*360)/144 = 9800
Frekvence pro Seben RA motor 12.67Hz Seben
Manuální původní verze 144:1 (worm gear) and 2.05:1 (printer gears) = 295.2:1. with a A4988 in a 16 microstep mode, a 200 steps motor will run at 3200 steps/revolution. if polar axis should run roughly at 23 hours 56 minutes y 4,0916 seconds (sidereal day) per revolution, this gives a 82800 s + 3360 s +4.0916 s = 86164.0916 seconds /rev. of the polar axis. for each revolution, the steps count for the motor will be (3200 x 295.2= 944640 steps), wich gives a (86164.0916 s/944640 steps) = 0.091213681 seconds/step, or 10.9632676703 Hz. this ~11Hz signal can be generated using an arduino. to keep costs low, a NE555 can be used. for a fast feed of the equatorial mount, a higher trigger frecuency can be used according t desired feed speed. a switch for direction changing of the stepper. is also recommended
