Specifications :

Software : Android app (Ez Goto) / Windows Stellarium

Communication : Bluetooth / USB

Power Consumption : about 20W~30W (12"~16" Dobsonian or larger telescopes)

Features : Push To / Goto / Electric Focuser / Micro motion

We will help the buyer to make connectors, label the wires and test the goto system (take a clip if requested) before packing them.

The buyer can wire and play them directly in few minutes out of the box if you have had a 20~24V DC power supply or a 12V battery with a DC-DC converter (contact us if you have any question).

We do our best to make wiring and power connected by the way of fool proof (such as fuse, diode, XH2.54 and PH2.0 connectors).  However, the basic electric and mechanical knowledge are required.  

We advise you to send us the Alt bearing cover if you need us to drill and tap 4mm threaded holes on it (addtional $15 labor cost).  It is better looking and saves you much time.  Certainly, you can DIY if you have a drill press (not hand drill) or send it later after the purchase.

The complete kit is Only Free shipping in Continental US.   

Power Consumption :

GSO 12" Dobsonian

AZ :  nema17 ( driver set 1.5A ) 

ALT : nema23  ( driver set 2.8A )

Focuser : nema17 ( driver set 1.5A ) 

Actual Power consumption:

20V -  0.8A at idle staus

20V - 1.15A while full speed goto and tracking

20V -  1.3A while tracking and focusing.

Products description :

Ez goto kit: Az/Alt encoder modules, Bluetooth and USB, customized signal wires and a pair of USB-UART for windows Stellarium         ....      $150

1. DC cable     2. main bolt with Az encoder magnet

3. screws and spare parts    4. Ez goto AZ module

5. Alt bearing cover with Alt encoder magnet

6. data cable     7. Ez goto ALT module

8. A pair of USB-UART (CH340E)     9. USB cable for Windows 7/10/11

Az/Alt gears, customized steel slides ( short 75mm slide), nema23/nema17 motor brackets.      ....       $100

10. short Az/Alt steel slides (75mm un length)

11. nema 23 motor bracket ( all stainless ) for Alt motor

12 nema 217 motor bracket ( all aluminium ) for Az motor

13. Alt stainless gear ( R=285mm )         14. Alt teeth wheel

15. AZ teeth wheel  ( MT2 / no fence )        16. Az belt ( MT2 )

long shatf motors    .....    $41

17. nema 23 (2.8A) motor for Alt  ($24)

18. nema 17(1.8A) motor for Az ( $17, high torque : 0.75 Nm,  30mm shaft length )

From 10~16" Dobsonian, We advise a nema17 on Az and a Nema23 on Alt.  The shaft length is critical in our goto system.  Basically, the standard motors works without any issue in GSO manufactured Dobsonian.   However, longer shaft helps much if you DIY the base with a thicker materials.

AZ and ALT Motors drivers : true 256 micro stepper, up to 5.6A     ....       $68

19. Dual speeds relay (5~7.5 DCV)

20. Az motor driver (DM556H)

21. Alt motor driver (DM556H)

* We have soldered two wires (green/white) out of the jumper 6 to switch goto at 64 micro steps and tracking at 256 micro steps.

The driver is true 256 micro stepper used on standard 1.8°/step motor.  It could be 512 when working with 0.9°/step motors.

we recommend 1/128 driver at least. Most 1/256 drivers work quieter, less vibration and better accuracy.  

Mostly, the 1/256 drivers are designed for Nema23 or bigger motor.  Remind you to order a driver which allows the smaller output for nema17(1.5A).  A smaller nema17 is capable of Azimuth motion in 8”-16” Dobsonian.

Handmade wires   ....   free 

22. DC cable, Az motor signal wire (4 colors), ALT motor signal wire (4 colors), reference voltage with a diode.

Handmade Power Board   ....   free if you order the complete kit

23. input 20-24DCV,

     4x outputs : 20-24DCV (Az Mtr/Alt Mar/Focuser Mtr/reference voltage) 

    3x 7.5DCV outpu t: (Goto board/Dual speeds relay/AUX)

You must use our handmade wires to run ez goto system.  The diode inside the wire aviods the damage caused by msitaken +/- electrodes.

Wiring power is quite simple but risky.  However, it would be very safe if you insert few diode inside wires or use fool proof connectors.

We are used to make red wire for 20DCV, yellow for 7.5DCV and black or white as ground (0 DCV).  However, we sometimes mistake the wires to damage the electronics.  It becomes very safe after inserting a diode inside each power wire.  Beside, we apply the fool proofed connectors (XH2.54 or PH2.0) to make sure them connected easier.

The signals between drivers is less than 24DCV mostly.  In order to simplify the power system, we advise little lower than 24V, such as 20DCV in our demo.

The goto board requires the power DCV5-15.  There is a tiny DC converter on the power board to provide DCV 7.5 for goto board and the dual speeds relay.   

Softwares and Documents

GOTO : 

Installation Part One (Az/Alt modules) Ez Goto Installation Manual Part 1

EZ GOTO PARTS & WIRING ( 10/13/2023 ) EZ GOTO LITE Instruction

The Manual to Wire EZ GoTo step by step ( 02/24/2024) The Manual to Wire Ez GoTo

AZ / ALT Software : Traditional Dobsonian

Windows (7/10/11)) Stellarium Software

( 06/12/2024 )  EZ GOTO Plugin for Win Stellarium (v3,2024)

** The lastest plugins (1) change the method to fine tune tracking rate (2) correct the error of motor leaning when alt encoder passes zenith

( 08/02/2022 )  EZ GOTO Plugin Manual

( 01/03/2023 ) EZ GOTO Power Management

Android APK (8/5/2022) EZ GOTO

Android APK (11/18/2022) EZ GOTO (Dual Speeds, API 28)

Android APK (05/30/2024) EZ GOTO (Dual Speeds, API 31)

** The lastest apk : (1) API31 for Android 11/12  (2) Correct bug in motor learning when encoders pass 0/360 degree. (3) Add Herschel 400 data searching   (4) micro motion / electric focuser are activated by the gravity sensor instead of buttons  (5) micro motion / electric focuser direction options (6) new algorithm to fine tune tracking rate

PUSH TO :

Without Goto gears, you can still run the goto kits as push to on Windows Stellarium

EZ PUSH TO Plugins  for Win Stellarium (v3,2024)  (02/06/2024)

Download the app ("EZ PUSH TO") from Goole Play store or

(04/04/2024)  EZ PUSH TO (API 31) (for most samsung models) 

* Samsung S10+ works with both apk.  But, few models have BT problem.  Please download and install above apk manually. 

Horseshoe EQ Software: DIY application

Windows (7/10/11)) Stellarium Software 

( 10/07/2022 )  EZ GOTO Plugin for Win Stellarium

USB Tools

(14/02/2024}  Paired USB Connection Test