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Linistepper Equatorial Stepper Drive


Roman has written an alternative firmware package for the Linistepper to drive an equatorial mount at a precise and accurate rate. ceefna's excellent home built star mount for astro photography is the first using this new code. The code not only drives the motor but also generates a very accurate stream of step pulses which turns the motor (and so the camera) at just the right speed to cancel out the motion of the earth, allowing very long exposures which increase the sensitivity of the film and the brightness of the stars. Check out his excellent video:

ceefna has written a spread sheet that will help in calculating the correct values to enter into the program to adjust it for your mount gear ratio, which has been adapted to this web page here. To use the form, just enter your gear ratio and press enter. For example, if your gear ratio is 4672:1, enter 4672 and press enter.

SIDERAL SECONDS

GEAR RATIO

MICROSTEPS

STEP TIMING
86164.1 ÷ :1 ÷ = seconds

The 2 dipswitches supplied with the Linistepper Kit are not used, and probably shouldn't be installed. The 2x5 header which normally carries step, direction and enable signals to the driver is used to select options, and can be connected to switches or just jumpered to the desired setting:

PORTA.F0 = INPUT_RUN run; (0v=run, 5v=stop) //normally the "STEP" input, on pin 5 of the header.

PORTA.F1 = INPUT_DIR motor direction; (0v=forward, 5v=reverse) // remains the "DIRECTION" input on pin 3.

PORTA.F2 = INPUT_SPEED selects speed 1 or speed 2; (0v=speed1, 5v=speed2) // normally the "ENABLE" input on header pin 1.

Custom chips available! Don't have a PIC programmer? Pre-programmed PIC's are now availabe, custom set to your gear ratio (be sure to specify your SPEED1 value when ordering).

See also:

file: /Techref/io/stepper/linistep/equatorial.htm, 4KB, , updated: 2012/2/22 23:35, local time: 2012/5/25 02:38,
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Stepper motors CAN be smooth!
And stepper controllers can be strong and cheap. Roman Black's Linistep stepper controller kits:
o 18th microstep
o Linear smoothing 		  o Open source
o Full kit $25!
 

Robotics nuts!

Check out http://users.frii.com/dlc/robotics/projects/botproj.htm from Dennis Clark. This guy ROCKS! He has made (and sells but also releases code, docs, etc...) for a number of cool little robotic modules including whiskers, IR proximity detect and remote control, Sonar proximity detect, PWM, Servo, compass. Most of these use the little PIC 12C508 controller which costs basically nothing and is soooo tiny.
The 4 servos, 2400 baud serial servo controller is a wonder of magic and he sells the programmed chip for $8. Wow!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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