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GigiG

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Everything posted by GigiG

  1. Thanks all, I've added the Gerber files, just in case ...
  2. Designed as a simple and general Stepper motor tester/controller, may be it can be useful also as a stand-alone programmable electronic focuser ... https://sites.google.com/site/gigimysite/home/gstepper Regards, Gigi
  3. Hi all, here is my just completed small project for an alluminium enclosure/case and OSD remote control to hold my ICX811 38x38mm CCTV board Camera to be used for EAA. Best regards, Gigi
  4. Thanks. It's an encoder/decoder system designed to monitors the telescope (GEM, Dobs, the mount type doesn't matter) axes rotations and give precise information of current position as output and compute the celestial coordinates at which the telescope is pointing so, as far as I know, it was designed basically to be a push-to system. However, I suppose that it can be implemented/integrated in others, more complete goto systems. Take a look at Dave Ek's pages for details.
  5. Hi all, It's been a while since I started my DIY DSC project but I finally have time to complete my gDSC. It's based on Dave Ek's DSC software and it uses Bluetooth (HC-06) for communications (PC's skycharts or Android SkySafari Plus) and two 'small and cheap' AMS's AS5040 Magnetic Rotary Encoders. Not extensively tested on field but it seems to be very accurate. I decided to try with the AS5040 that have 1024 tics/rev resolution (10 bit) but the AS5045 may also be used (4096 tics, 12 bit). If someone was interested, here is my gDSC web page. Comments and suggestions are welcome. Cheers, Gigi
  6. I have two cameras candidate for a DIY cheap CCD based polar scope, an ICX811 based DIY analog board camera and a USB RisingTech IMX224 CMOS. Both 1/3", 976x582 effective pixels (pixel size 5 µm x 6.25 µm) for the ICX811 and 1280x960 pixels (3.75 µm square) for the IMX224. I was wondering which of these objective lenses is more suitable for SharpCap polar align tool. Focal length available are 62/100/106/135mm. Thanks https://it.aliexpress.com/store/product/HD-Short-Focal-Length-Objective-Lens-Blue-Film-Green-Film-for-Teaching-Physics-DIY-Binoculars-Spotting/1093974_32817293499.html?spm=a2g0y.12010108.1000016.1.7ff28de48RP8H7&isOrigTitle=true
  7. Hi all, I was wondering if anyone has already pointed out or have been dealing with this optic's AliExpress seller. Some items caught my attention, for example there is a double air-spaced refractor objective D90-f5.5 for about 77$ but I'm not an expert and i'm only thinking about a possible DIY Very Low Cost refractor for EAA. The mirrors are not advisable because they are only spherical, not parabolic. Kind regards
  8. Yes you need these SSOP16 SMD ICs on a breakout boards. I've got these:http://m.ebay.com/itm/5-pieces-SSOP-16-SSOP16-to-DIP-16-Pin-Adapter-PCB-SMD-Convert-DIP16-/141638220193?txnId=1190315105004
  9. ... FedEx ... not WebEx, sorry
  10. Glad to hear that my litle project can be helpful, Andy. The delivery from Austria to Italy took only a couple of days with WebEx. If you like I can send you the svg files to home etching my boards (main Ek's interface for HC-06 Bluetooth board and the mini MRE support board). Anyway please keep me posted about your implementation, Gigi
  11. They are separate. Here the page for the magnets.
  12. You can obtain three free samples for both encoder and magnets directly from the product pages
  13. Hi, I've just build my first prototype of an Ek's DSC Bluetooth box that uses two AS5040 Magnetic Rotary Encoders (AMS). These are 10bit incremental encoders (1024 ppr) but I've tested also a couple of AS5045B (12bit, 4096 ppr) and they seems to work fine and they are promising. I don't own a Dobson to test these box on field but I'll try it as soon as possible on my NEQ3 or may be with a pan&tilt head holding a green laser pointer. Comments and questions are welcome. Ciao Image gallery and some videos: youtube1, youtube2, youtube3
  14. Thanks to all. I hope to make some shots as soon as possible. If someone is interested in building an electronics box like mine I'll make available the .svg mask for home etching the PCB (for both DRV8825/A4988 and EasyDriver).
  15. Hi all, just completed my metal barndoor project, built using simple hollow profiles of alluminium. The stepper is a RepRap like NEMA17, 12V. The electronics is based on an Arduino ProMini and an A4988 driver (I also built a version with an EasyDriver) and the software was written by Daniel Berrange. The critical part was the main hinge. I first tried to use a simple brass hinge (like those used for wood cabinets) but because of too much play I figured it was better to build a dedicated rotational joint by myself. Now it works very well. Hope that might be of help for someone diyer ... Ciao Gigi
  16. Hi all. I got a couple of Magnetic Rotary Encoders (AS5040, 10bit 1024 positions per revolution) that I wanted to use on an old pan&tilt DIY project (here). I was wondering if these type of encoders can be implemented in a Ek's DSC like system. Regards Gigi
  17. Hi all. Here is my solution (sorry, it's in italian but with image gallery and video in the bottom of page) for an EQ3 with DIY motors and controller (PicGoto). The motors are intenally geared (42:1) 12V unipolar cheap chinese steppers, directly connected to the worm gear. Hope can help. Gigi
  18. Hi all, I have a couple of DRV8825 and two RepRap NEMA17 steppers (200 steps, 0.95A) so I'd like to try an DIY AstroEQ on my NEQ3. I read something about the possibility to build an 'hardware simplified' AstroEQ system based on an Arduino Mega board. The questions are: is it possible to use a 'clone' Mega board (seems that there are some of these cheapy boards on the internet) or it would be advisable to use an original one? Furthermore, where can I find schematics and partlist for this AstroEQ hardware solution? Thanks in advance, Gigi.
  19. Thanks Tom, in fact I was thinking about two alternative Nema14 bipolar steppers, to simplify things ... Cheers
  20. Hi all, I found some topics on this thread but I've not well understood yet so sorry for my question that probably has already been made. Basically, I was wondering if it is possible (and which applications to use in this case) to set up an AstroEQ DIY board and control it with a Linux box with Linux native software only. I read something about EQMOD with INDI and KStars. I have currently a NEQ3 motorized with a couple of little and cheap chinese geared steppers (my web page here), controlled by a PicGoto board in Windows, via an ASCOM dedicated driver. Using this system under Linux is not trouble free, almost all software should be used under Wine. So I'd like to know if AstroEQ can be controlled effectively with Linux native software to control my motorized NEQ3 (I don't have SynScan or other intermediate controllers). Thanks for your attention. Gigi
  21. The secondary support bracket is very robust. It is based on an alluminium strip 1mm thick (25mm wide) curved by hand and it is stiff, more than enough . I can adjust the position of the secondary mirror holder moving its curved bracket with respect to the turret assembly and eventually increasing/decresing its height slightly modifing the curvature of the bracket itself (didn't need to do, however). Not yet tested 'on field' but the collimation was relatively simple (my 6" is an f5). Thanks to all for comments! Gigi
  22. The main beam is composed of two 30x15mm aluminium section profile (1mm thick), fixed togheter side by side and about 700mm long. G
  23. Hi all, I've just finished building my newtonian 'light' structure and I'm rather satisfied. The overall structure is rather light (2.5Kg without mirrors) and stiff. The original project was to design a structure different from the usual rigid tube for my first 6" mirror (second hand on italian Astrosell online market). At the mean time, this 'main beam' layout give me the opportunity to evaluate an alternative focus mechanism (of course I was inspired by already existing designs seen on the web in the past). A longitudinal focusing rail to replace the classic radial focuser. The focus is adjusted by translating a 'dolly' that carries the secondary mirror and the eyepiece/camera turret, by means of a threaded rod. Rigid Teflon like plates are used to minimize friction on the translating surfaces. Comments and suggestions are welcome. Ciao! Gigi
  24. GigiG

    Hi from Torino

    Hi all, I've been interested in astronomy and telescopes for sometime in the past, when I was teenager (so, many many years ago ...) then the passion asleep for a while. One year ago my wife gave me a LidlScope, the Bresser 70/700, and the sacred fire awoke (I know, this scope is just more then a toy but I hope that it is sufficient to re-start with). Ok, the Bresser OTA may be sufficient but its mount is terrible so I found a reasonable alternative, a new Skywatcher NEQ3 mount from Germany. Searching the web for a simple (and cheapy) technique to motorize the NEQ3 was the next step. I found the spanish Picgoto group that was very interesting and promising. Finally, I build my own Picgoto++ controller with a couple of cheapy chinese steppers. In case someone is interested, here is my PGT++ web page (sorry, not in english yet). Cheers, Gigi from Italy
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