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With the LittleFoot Controller I do not only present a stepper controller with a competitionless price, i also present a controller with substantially more features then any other controller out there! She proves that efficiency does not have to be expensive!
The LittleFoot is used very gladly with the MT-1 engines and their clones, but the controller works also with all other mounts, e.g. Vixen GP, GP-E, GP-DX, Astro-5, Celestron ADM, Syntha EQ-4, EQ-5, SkyView PRO, GM-8, CG-11 and many other more, together. As the used Firmware is similar to the HEQ-5/6 MCU Update Kits (the Configurationssoftware and the Firmwareupdate is identically too.), LittleFoot has the same features. These are:
As all my Projects LittleFoot can be ordered as a Selfconstructionkit or a ready made controller. The Plate of the Selfconstructionkit has allready some parts on it because i do not want, that you have to solder those small SMD Parts and there are some extra parts needed to programm the soldered MCU. With the selfconstruction kit it should be easy to construct the Controller if you have some expirience with soldering. If you do not have this knowing, you can order the ready made controller as well. To configure the Parameter i wrote a small tool that can be downloaded in the Softwaresection. The Gearconfiguration will only take affect after you powered the controller down!
LittleFoot is now Open Hardware: Because of the LittleFoot Vpower this project is discontinued and offered as Open Hardware Project. I leave the construction plans online for those who like the self construction.Recommended accessories:
Here the guidance for the self construction, that also has the connection diagram for the connector ;-)
Software and Infos for LittleFoot: V4 Control from Doug Dieter (Win32) MCU Configure from Rick Saunders (Linux) Aspect from Wolfgang Hoffmann (Win32, Linux) LittleFoot MCU Update V3.40 (Win32) LittleFoot MCU Update V3.40 (PocketPC) LittleFoot PEC Explorer V1.30 (Win32) LX200 Tester V1.00 (Win32) LX200 Tester from Stefan (Linux) LittleFoot Protokoll (PDF) LittleFoot Handcontroller (JPG)
Guidance for the self construction: The selfconstruction kit includes anything what is needed to successfully build the LittleFoot controller. A Drillingtemplate is included in each kit as well. With a little bit expierence in soldering, there is no problem to build the kit. The MCU is allready programmed, so there is no need for a programmer or other special hardware!
As i mention above the PCB allready has some parts on it. This has some simple reasons. First i do not want that you have to solder small SMD parts and second there are some extra parts needed to programm the soldered MCU. All future Softwareupdates can be saved easyly over the serial interface.
The Schematic of LittleFoot shows, LittleFoot is constructed simple and easy. Except the two MCU's there are no special parts on the PCB. The here shown construction steps are just shown as sample. Any other sequence will also end up in success ;-) At the first step i recommend to solder all parts on top of the PCB. There is nothing special on this side. Just watch IC4 because this MCU is sitting in a socket.
At the second step all parts on the bottom of the PCB are soldered. There is nothing special to know or watch here as well. Just put the parts in the holes and solder them. The Voltageregulator IC6 is dimensioned for the MT-1 Motors. If using other Motors this regulator can be changed to any other type. If you don't know, just ask me. As general the voltageregulator is correct. IC5 is allready soldered ;-)
If so far everything is fine we can check our soldering once again and get ready to finish the Handcontroller housing. Here we cutout the printed Drillingtemplate and put it in the box.
Here it is wise to punch the center for the hole and remove the template before drilling. Do not throw the drilling template away because the connection diagramm for the motor connector is also printed on there ;-)
The other side of the housing can be fixed as simple as above. I suggest to drill two 6mm and one 8mm Hole and then file the 6mm Hole to the border. The slotted holes are used later for the pull relief of the motor cables.
At the front end we file a cut-out for the main connector in the housing. Here we can use the ready made PCB to check if the connector fits correctly. At this point it is also meaningfull to check if the bottons can be pressed easyly. If this is not true, we can enlarge the 10mm hole with a file a little bit. If so far everything is fine and the PCB is sitting well in it's housing, we can solder the wires for the switches and motor cables. This should be done before mounting the PCB in the box. The wires for the switches can look in the sky and will be soldered to the switches after we mount the PCB in his case. As next step we mount the switches to the case.
Now we can connect the switches as shown in the wire diagram.
As last step we put the pull reliefs on the motorcables and colse the controller case.
The connectors for the motors can differ from modell to modell. In the kit are two 8pol. DIN Connectors that will fit for the MT-1 Motors and there clones. The connection diagram for these connectors are printed on the drilling template.
Fronttemplate for the LittleFoot: The last finish for the LittleFoot comes from Zernie who created this Template!
You can download the Template and print it out ;-) That's it, now i only have to wish a lot of fun with the LittleFoot Steppercontroller :-)
Handbox Menus: In order to be able to configure and control parts of the functionality with the hand controller, i programmed a second processor in the handbox . I tried to avoid the green LED and like that this LED is only active in the PEC training. The LED color conditions: Red on = PEC active Red off = PEC deactivated Orange on = Key pressed Orange blinking = menu Green blinking 10s = PEC Training begins Green on = PEC Training running The software in the handpaddle has 3 menus. These can be activated over the switch (2x = menu 1, 8x = menu 2, 16x = menu 3) and the simultaneous press of all four direction keys. The LED flashes then 1x, 2x or 3x briefly. In the menu the direction keys have the following meaning: Menu 1: Left = Focus (-) Right = Focus (+) Up = Toggle 2x <=> 1.3x Down = Find Object (see Update Kit Protocoll) Menu 2: Left = speed Lunar Up = speed Siderial Right = speed Solar Down = no tracking (terrestial) Menu 3: Left = PEC off Up = Start/Stop PEC Training Right = PEC on Down = Invert GOTO DEC direction If both RA or DEC keys are pressed at the same time, the direction keys are exchanged.
Connection allocation of the connetor plug:
Too good lastly still the sayings, without which it unfortunately sometimes comes in our constitutional state to misunderstandings: The structural drawings veroeffenlichten by me, plates etc. are freely reproductionable for private users. A commercial marketing of devices to these structural drawings to attribute are, is permitted only with expressly written permission. Reproduction and application to own danger. For function and/or for possible damage, which due to reproductions, which from me publish structural drawings, plates etc. result in, I do not take over myself any responsibility! That sounds itself badly, is however half so wild (with me everything functions perfectly). I have only no desire me for a damage to answer for, only because someone has from such things no notion, a Akku short circuit and the hut or other absengelt. Copyright © 2004 by Anand Rajiva , E-Mail: LittleFoot@rajiva.de PLEASE CLICK TO VISIT THE SITE |
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