It had lots of linear amplification - lots and lots of matched NPN/PNP power transistors. I didn’t have enought time to order parts, design and etch the PCB, etc, so I decided to use whatever I had around. 1-24 of over 1,000 results for Electronics: Camera & Photo: ... STEPPERONLINE Short Body Nema 17 Bipolar Stepper Motor 1A 18.4oz.in/13Ncm DIY CNC Extruder. A pair of tensioner screws push the motor away from the driven pulley. If I remember correctly the gist of the discussion did not favor steppers.Does anyone remember a discussion along these lines?I … It turns a 16-tooth pulley and drives an 85-tooth 3D printed pulley. There are key steps here: (1) you need to build a board that can make a motor spin at a constant speed, (2) look for a suitable gear system/drive configuration, (3) attach the motor to the gear system/drive, (4) spend some nights “adjusting” the motor’s … The other benefit of using a local server driver is that the telescope controller can also run the focuser motor – no need for a second controller. I use Astrophotography Toolkit (free to try a full-functional version, and affordable to purchase a license) and PHD2 Guiding (free!) I had this LT1117 LDO board from an earlier project. When cramming everything into a case I was repeating to myself: “I will never design a PCB without selecting a case first again, I will never design a PCB without selecting a case first again, I will never design a PCB without selecting a case first again, I will never design a PCB without selecting a case first again…”. Thinking back, I should have used a thicker interface plate on top, perhaps 1/4″? but I’ve opted to use a modified barn-door drive. Unfortunately it seems that the plastic transmits a small amount of light, so the camera is sensitive to ambient lighting near the scope. 72 sold. Demonstration of slewing performance and tracking accuracy using the direct drive module. Thanks for reading! Howard even created a free Android appfor controlling the mount. The knob you see to the left of the motor is the release mechanism that allows me to manually move the scope sideways without damaging the motor. So I removed the low-speed knob (and lost it…) then turned an aluminium replacement knob to replace it. Focus accurate and fast your telescope using our powerful Motor Focus Kit v2. I’ve been using my 100mm f/2.8L Macro for now, but would like to get another lens to use permanently (since I still like to use the lens for regular photography). The driver is powered by 6 AA batteries. The drive motor is mounted on a 3D printed PETG mount. It precisely controls the telescope's tracking speed during long, timed exposures of celestial objects, producing the best possible image sharpness. An Arduino would be just as good, but I prefer to build the entire controller on one PCB. A DIY driver for EQ2 equatorial mount motor We wanted to give a telescope as a Christmas present to one kid. Celestron Astromaster 130 EQ MD Motor Drive Reflector Telescope #31051 UK Stock 4.5 out of 5 stars (12) 12 product ratings - Celestron Astromaster 130 EQ MD Motor Drive Reflector Telescope #31051 UK Stock This high resolution geared box has a 0,06 degree step size can can easily lift more than 6 Kg. The PETG mount is flexible enough that I can just slide the motor shaft into the knob without separating the motor from the mount. You can see above how it folds nicely. I had dissasembled some projector TV I had found on a street a year ago. The RA barrel lift uses 1/4″ threaded rod. Some parts are painted, some are not. ... mmaarrccoo DIY … Unfortunately I didn’t document the process, but you can find the STL files for 3D printing on here on Thingiverse. So I decided to try build an astrophotography (AP) setup without draining the bank! The other side of the knob has a 5mm hole. Two 1/4″ UNF studs protrude from the side. An M5 screw (not shown) tightens the clamp around the telescope. A 3D printed battery blank (found here on Thingiverse) is wired up to a switching power supply (set to 7.4V), which connects to the telescope power. The tripod was painted red to improve visibility under red lights. Here is a closer shot of the azimuth motor. Voltage for the motor is provided by an adjustable switching DC-DC converter based on LM2596 (a cheap Chinese module off ebay). It contains a wealth of information for hobbyists looking to build a DIY computer operated telescope. For more detail: The DIY Arduino Telescope GOTO control project The following example shows the theoretical expected performance and limitations of a metal band drive used to drive a telescope. I expected to use the set screw to secure the motor shaft, but so far it seems that there’s just enough friction that the set screw does not need to be tightened. I can compensate by aiming slightly east or slewing east after it’s engaged. Let your telescope do the driving! Please excuse the poor surface quality of the driven pulley, I attempted to print embedded text into the pulley but failed with the more difficult PETG. Right now there aren’t any stops on the screws, so the knobs will fall off if they’re backed too far. Telescope Drive Motors - posted in ATM, Optics and DIY Forum: I dont remember what forum I was reading but not too longago there was a discussion on what type of motor is best for telescope drives synchronous or stepper. The declination drive motor has some tolerance for error and is controlled using the AccelStepper library. I hacked a Microsoft HD-6000 into a scope cam. I want to thank the author of this page for providing valuable information about motor rotation speeds and gear ratios. It was also impossible for me to change the programming or maintain the system. Arduino can actually turn off the power to the telescope mount itself – handy when you detect an problem. It’s heavy but still manageable. Aug 2, 2020 This post is the first real part of my self made GoTo mount series. Certainly - for my scope - wouldn’t be able to handle a phone or camera attached to the scope. The controller uses an ATMega328P microcontroller with an Arduino Uno bootloader. The telescope gets mounted on the end of the declination shaft. Two small springs automatically open the clamping block when the knobs are loosened. A 5/16 UNF bolt locks each leg forward. Polar alignment is a bit easier with the illuminated reticle. This will drive another Bayside gearbox, this one 3:1 and then that will drive a 80:1 harmonic drive which will have the saddle for the telescope on it. To make life much easier, I built a dovetail clamp that bolts onto the declination shaft. Recently, I bought a 8" Newtonian telescope that came with a Dobsonian mount. I would share my own design for the switching supply housing, but it’s no better than the plethora of housings already available on Thingiverse. The mount fastens to the round interface plate on the top of the tripod. I can aim the scope using the three red screws, but that really isn’t a fun activity. This includes the L298 unit, the encoder counter, various hall sensors for doing PEC and fuses and relays. How do you drive a bipolar stepper? Here you can see an H-bridge circuit built using BDW93/BDW94 Darlington transistors - those just happened to be laying in my junk box after One battery can power my scope for several hours in the cold. I recently delved into it with my 80-200 f/2.8L and a home-built tracking mount. 4.5 out of 5 stars (12) 12 product ratings - Celestron Astromaster 130 EQ MD Motor Drive Reflector Telescope #31051 UK Stock . Oh well, I can go out and check the scope every now and then…. Since the drive is limited to only a few hours of tracking, most of the slewing is done manually by releasing the clutch and manually aiming the telescope. Notice the rifle scope. Using my little telescope: 1.5 arcseconds, or 0.0004 degrees, of error is an entire pixel of blur! I used to have the scope’s mounting rings bolted directly onto an adapter plate, but this was annoying as I couldn’t quickly remove the rings. Use this small Celestron Motor Drive to automatically track stars as they make their westward movement across the sky. The final driver in an enclosure looks like this. I opted not to paint the parts that are still being optimized. A clamping screw on the red part secures the motor. Just keep in mind the precision required on these drives. On average it draws about 0.1A of current at 6.5V, this allows for some 8 - 12 hours of operation on one battery set. This dual axis motor drive, with drive corrector capabilities, is designed for Celestron's CG-4 mounts for tracking in RA and allows movement in DEC. The problem was that a telescope alone is useless for star pics – some quality infrastructure is needed. In 24 hours this is only slightly more than one full revolution (360°), so in one hour the platform should turn 360/24 = 15°. I decided to make do without a tumbler for changing a default direction of rotation, but add a potentiometer to fine-tune the rotation speed. Comparison of the three methods to add tracking to a telescope: Changing to an equatorial mount: advantages: if carefully polar aligned, a single drive motor operating at a constant speed can handle the tracking, drawbacks: a heavier more complicated mount that is trouble to transport, eyepiece can be awkwardly placed unless a rotating tube cradle is added, and the … The code and schematics are available on my github repo if someone wants to reproduce this or just to poke around. I’ve tried to reproduce the functionality of the commercial EQ2 driver. The LDO was of the adjustable variety, so I hooked it up to source ~3.6V for a microcontroller. The bottom of a veroboard never looks good, but in this case I’m pretty happy with it. The code is not spectacular - I have an array of H-bridge switching configurations and output them to MCU IO port on every timer compare match interrupt: Published The driving arm slides onto the right ascension shaft and is secured with a wing nut. Hopefully others can learn from my experience and enter the world of astrophotography without such a massive front-end cost. I think it is the best solution especially for you, since you need to drive more than one motor.
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