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Updated 2018-02-01 Introduction This is an Arduino-based rotator interface that interfaces a computer to a rotator or rotator controller, emulating the Yaesu GS-232A/B and Easycom protocols which are supported by a myriad of logging, contest, and control programs. It can be easily interfaced with commercial rotator control units. With the addition of a proper capacity power supply and several interface components such as relays, this unit could also serve as a total replacement for a rotator control unit or serve as the basis for a 100% homebrew rotation system. Several azimuth and elevation position sensors including potentiometers, rotary encoders, and I2C devices are supported. The code is very flexible, modular, and easy to read allowing intermediate and advanced experimenters and builders to customize it. And the rotator controller he built using the K3NG Rotator Controller code.
Here’s a demonstrating his customized K3NG Rotator Controller build. Looking for a PC board or kit?
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This is a very interesting project for me, as I’m looking for an interface for my G-1000SDX and a home made elevation system with an actuator and an ordinary potmeter for elevation readout. If I’ve read well these are both supported by thsi design/project. I’m not into PIC programming e.g. But very familiar with electronics and a bit of programming. When I sudied electronics back in 1985 we used 8088 (IBM) / 6502 (Apple) / Z80;-) programming in machine code. Those were the days my friend hihihi thought they never end My question is what do I need? A development kit?
8 or 16 MHz clock? Any info would be very welcome. Got the boards, start plumbing and YES got it working for Azimuth, haven’t connected Elevation at the moment as I need to make some connections on my elevation rotorboard. The only thing which is strange is that the heading is allways North on the display.
Azimuth is showing 83 deg for example but the text above shows North, no matter what direction I turn. Also when I let HRD turn the antenna by clicking a direction.
The display shows Rotating to 99 deg for example. When the rotor stops at 99deg Bearing shows North. So making progress.;-). Hi Goody, i am not sure if you get my previos mesage! I would like to use multiple rotators with Arduino cards and to controll it with Microham Stationmaster. MH SM have outputs for CCW and CW reference voltage (not needed) and POT input (analog).
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In this case i will need probably DAC inbetween Arduino and MH SM. Idea is to get same analog level from each rotator (of course over arduino and DAC) for all rotators for each antenna direction! Then i cann swicth any rotator (automaticly or manual) i have to MH SM. John PA5MS is correct in his response below. This Arduino project essentially does a portion of what the Microham unit does, interfacing a rotator controller to a computer.
It sounds like you want to switch the CW rotation contact, the CCW rotation contact, and the analog azimuth voltage line between multiple rotators, allowing the MH to control multiple rotators. This is fairly easily to do with switches, relays, or transistors. It would not require an Arduino unless you wanted to interface it somehow to a computer or you needed something more intelligent to invoke the switching.
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I’m not familiar with the MH unit capabilities, however I’m guessing you could use contact closures to control a switching circuit which would be a more integrated solution than an Arduino. If you need just a simple switching circuit, let me know and I could probably draw something up. Braco, I think you don’t understand quite well what this rotor interface does. It is a sort of digital read-out of an analog rotor with POTMETER. Also this controller is an interface between your computer and the rotor. It makes it possible to control your rotor by computer. Like with Ham Radio Deluxe (HRD) It can replace you rotor controller if you use relays and a suitable power supply.
If you understand the concept then Also I don’t understand what you have in mind to build with the microham station manager. I think the station manager is also a computer interface to control a rotor which the arduino is as well so basically the same. Hello John, well i know very well what for it is! I have 12 differnt rotators and i would like to use single controll box for it! In this case i need same signal level from each rotator pot. My idea was to use Arduino to digitalize analog signal from pot and then convert it back to analog but with same signal level for same direction!
This will allow me to use single controllbox for all rotators i have of course i will need to install on each rotator one card and i will need to have some switching martix for it! MH SM i have allready and i want to use it as controll box, but it could be anything else! Branco, Now it is clear to me what you want to do with the arduino board. The rotor interface has no control voltage output for Azimuth / Elevation.
These are just inputs which the board needs to read Azimuth and elevation. So it reads the analog voltage from the pot and calculates the coresponding Azimuth / Elevation and shows this on the display.
Don’t think you can use it as a sort of “level converter” wich gives you an equal output at an Azimuth / Elevation regardless the rotor you use. Think there are easier solutions to convert the azimut / Elevation from whatever rotor you use to a “standard” for example 0.00 to 5.00 V output The Yaesu 1000SDX rotor has an adjustable output 0 to 4.5V for 0-450 degrees If your rotor has a potmeter inside you can use a simple op-amp circuit to adjust the level to a “standard” which is useable for you. I’ve never worked with compass sensors or accelerometers, but looking briefly at the data sheets for both of the devices you mention I see they have I2C interfaces.
This would make it fairly easy to interface both devices to an Arduino. With a little bit of research, I could probably give you some code to do this, however the readazimuth and readelevation subroutines in the code are where you would want to drop the I2C interface code in to read the devices. Let me know if you want to pursue this. Hello Goody, Thank you for great arduino project! I need to ask, is this motor shield can be used instead of K3NG rotor interface?
“This motor shield allows Arduino to drive two channel DC motors. It uses a L298N chip which deliveries output current up to 2A each channel. The speed control is achieved through conventional PWM which can be obtained from Arduino’s PWM output Pin 5 and 6.
The enable/disable function of the motor control is signalled by Arduino Digital Pin 4 and 7. The Motor shield can be powered directly from Arduino or from external power source.” Thank you,. Yes, I think it could. I’m a little unclear on how exactly the direction pin works. Does the PWM always control the speed and a high on the direction pin reverse the direction, and a low makes it go forward? Are you intending to use this to build your own rotator? You would also need potentiometers for reading the azimuth and optionally the elevation.
In the code we would need to convert any digitalWrite command for the rotatecw, rotateccw, rotateup, and rotatedown pins to instead turn on the necessary pins for the shield direction control and PWM output. This would not be hard to do. I would convert the digitalWrite statements to call subroutines to do this. Let me know if you’re interested in pursuing further and we can look at it in more detail.
Hi Woody, thank you for prompt reply, I am collecting information to build an antenna rotator from a common ham rotator 360deg potentiometer sensor type as azimuth and a satellite actuator screw jack reed switch sensor type as elevation. The reed switch sensor will be changed to potentiometer later. Please look sample codes at: It’s Arduino variant which is embedded a 2A rotor shield.
It might have all the codes we need. Please take your time, I hope it will be a contribution for your great rotor control project. First of all many thank for your super project for Arduino rotor-controller.
I just started playing with arduino uno and uploaded your software setting some #define as required by my setup. Seem to work great except command Mxxx. Let me explain: – rotor is a Kenpro KR-5400B (only azimuth is actually used) – Azimuth indication on controller is 180 – 270 – 0 – 90 – 180 (so center is North ) – Potentiometer voltage out: left 180 = 0V / North = 2,5V / right 180 = 5V I try different software setup and tweak(360 deg rotor, nCenter, etc) and got correct azimuth indication on serial monitor and display, but if i give Mxxx command, something go wrong. Example: actual azimuth = 90 deg (the needle is on the right side of controller’s indicator and voltage about 3,7 V). Send M270 command, it should move CCW because position 270 is on the left side of indicator, voltage = 1,25V. Rotor start turning CW instead CCW, I think because he knows that 270 is than 90 so also analog voltage should be greater. For sure I am doing something wrong.
Any comment please? Thank you Pietro / hb9rxc. Hi Goody thank you for prompt reply! I downloaded your latest release and comment out #define OPTIONNCENTERROTATOR as required (but why? It is a N-center system )and uploaded. After calibration I moved to 135deg (right side of indicator) and then issued a M270 command.
Now rotor start moving in the right direction CCW but when passing 360 (north) beaming to 270 it stop and goes back CW to 020 then stop. I tried also to go manually with controller to 270, but everytime passed 360 sostware bringh back to 020 I wrote my own software (based on VE2DX example) with couple of tweaking to solve this problem actually it’s work great! I would like to send you my rotor.ino file but I need your PM e-mail. Btw if you are interested to see what I deed! Waiting 73′ Pietro.
Hi Radioartisan, thanks for great rotator code. However 90deg overlap one way and none the other direction is not my favorit food. My rotor G-800 ( and box) has mechanical stop in North + 90deg overlap. However I have offset the rotor in the tower -45deg, giving me an overlap of 45deg CW but also 45deg CCW. Can the code compensate (calibreate) this 2x45deg overlap? Great with PWM and slowdown before fullstop, but how about a slow-up start? Again great code, happy easter, vy73 de oz1bxn chris.
Hi Anthony, I was given a old Yaesu G-800 rotor without anything else. I was going to develop my own controller but fortunatly ran across this web page and you saved me a lot of time and effort. I ordered a arduino uno r3 from mp3car, a sainsmart 12864 glcd from sainsmart and went for it. Though there were some challenges in your latest release, CODEVERSION, I did get it working over the labor day weekend. Your program would show only short unreadable pixels on my display.
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I kept thinking it was my display or character addressing routines but by changing the ‘’ to a ‘ LCDUPDATETIME) ” in your updatedisplay function, I was able to get it working fine. To get to this point I placed debug statements inside that “if” test and they never printed. I found millis was below count of lcdupdate which stayed well below LCDUPDATETIME. After getting it working I took a pause and have not determined why this was happening. Testing with HRD rotator using LED’s for the azimuth motor drive and a 500 ohm pot it all checks out.
Later I would love to take up a question about how the overlap is only used on one direction of the rotor giving a large overlap rather than on both ends of the rotor’s rotation range and dividing the overlap in half, My rotor has 45 degrees of overlap at the end of CW and CCW before activating the stop switches as I interpret it. Again, thank you for some most excellent project and code. AF5FP — Don Lewis.
Note that the latest release is on SourceForge, though there weren’t any changes that I can recall in the area of the code you’re working on between 1 and. If ((millis – lastlcdupdate) LCDUPDATETIME) This line of code checks the duration of time since the last LCD update and if it’s over LCDUPDATETIME which is defaulted to 2000 mS (2 seconds), it updates the LCD.
If you’re changing the “” to a “. Regarding “overlap”, it’s more a state of mind than actually placing it somewhere, if that makes sense.:-) If you manipulate these lines: #define AZIMUTHSTARTINGPOINTDEFAULT 180 #define AZIMUTHROTATIONCAPABILITYDEFAULT 450 you can pretty much place the rotation wherever you like.
If your G-800 controller is like my G-1000, you can move the needle to accommodate a “non-standard” starting point. The overlap LED won’t come on after the usual 180 degrees when going clockwise, but will come on after 360 degrees of rotation. Pingback:.