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07-31-2009, 07:33 PM | #61 | |
RCC Addict Join Date: Oct 2008 Location: Plainfield, IL.
Posts: 1,297
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http://www.hobbycity.com/hobbycity/s...x_&_Rx_(Mode_1) Think this one will have a spring on the left stick for throttle? | |
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08-01-2009, 12:53 AM | #62 | |
Rock Crawler Join Date: Feb 2008 Location: UK
Posts: 818
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08-01-2009, 07:10 AM | #63 |
Pebble Pounder Join Date: Jul 2009 Location: Windsor, UK
Posts: 141
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that rotary switch sounds perfect. Add in a few 3 or 2 way switches and you'll have a radio that IMO someone should release as a crawler radio. Any idea if you're going to do momentary 3-pos switch or normal one? I suppose for a winch a momentary one would be best, but for a dig you'd want one that stays where set. Perhaps have one of each, and the 3-pos 'normal' switch could also be used as a 2-way if preferred (for lights etc) |
08-01-2009, 07:46 AM | #64 | |
Rock Crawler Join Date: Feb 2008 Location: UK
Posts: 818
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I've followed the wiring colours of the original Turborix Tx where appropriate. I've had a closer look at the "spare" channels. The elevator channel (ch2 on my Tx) and channels 5 and 6 can all be converted, as 5 and 6 use standard 5K pots, same as the stick channels. This leaves us with 5 or 6 channels to configure any way that's needed for a particular crawler. If you have 4ws, you can use the rotary switch, leaving 2 channels for 2- or 3-position switches. If you have dual ESCs, you'd probably use a 3-position rotary switch and have three 2- or 3-position switches If you only have a 2ws crawler, you can have four 2- or 3-position switches. The reason why 4ws has less channels is because you need 2 of the 3 mixes to make the steering work, meaning that you can't use both chs 5 and 6. I actually have no use for a 3-position switch, I'm doing this purely for fun, although I'll probably add the rotary switch to my original DX6i/Mars conversion. The Tx might be available when I've finished, if none of the local crawlers want it. I think that I'll build it with one of each type - latching and momentary. I agree that it'd be nice if someone made these for sale, although I doubt that there's much demand here in the UK. I'm working full time, plus I'm running my own small business, so I don't really have the time to do this. A one-off maybe, but not in any kind of volume. | |
08-01-2009, 08:07 AM | #65 |
Rock Crawler Join Date: Feb 2008 Location: UK
Posts: 818
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3-position switch mod has been tested. Here's the schematic: And the test rig: This is the "full house" mod, allowing easy adjustment of the centre point (left pot in drawing and in photo) and both end points. This could be useful on a cheap programmable Tx like the Turborix, and is definitely useful on a non-computer Tx. If you want the trim and EPA adjustments easy to operate whilst driving, use proper pots. If you want to hide them away, use trimmers. With this setup, the trim range (centre position adjustment) is adjustable over the entire travel of the servo. The endpoint adjustment (switch in either of the "on" positions) range is from about 25% to 150%. This adjustment range should cover all real-life applications. I fitted this on ch2 (right stick up/down). I removed the 3 wires from the pot and soldered them to the 3 wires coming in at the left of the pic. The colours match those on ch2. The same mod will work on ch5 or 6, but the centre wire colour is different. The pot or trimmer values aren't set in stone - use something close, whatever you can get your hands on. Don't go too low, though. |
08-01-2009, 08:41 AM | #66 |
Pebble Pounder Join Date: Feb 2009 Location: LeMars, Iowa
Posts: 158
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You guys will have to forgive me, but I just finished up my $50 ghetto 6ch tx, and felt the giddy school girl need to post something about it. I know this thread has progressed much farther tech-wise than what I've been working on the last couple of nights, but here goes. Of course, like all projects, it's not finished: No, it's not a bad photoshop job, it just looks like it! It's pretty rough, but then again, I've only got about $50 total invested. Until I can find a better solution, I'm running ch 2 & 5 mixed for throttle control. The goal is the have the ability to run ch 1 & 4 , and ch 2 & 5 mixed or stand alone at the flip of a switch (just ran out of time the other night, and wanted to test it before I went any farther). |
08-01-2009, 08:50 AM | #67 |
Suck it up! Join Date: Mar 2008 Location: Arkansas
Posts: 11,652
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Holy hell, that thing is an abomination! Let us know how it works! |
08-01-2009, 09:02 AM | #68 |
Pebble Pounder Join Date: Feb 2009 Location: LeMars, Iowa
Posts: 158
| It definitely is...but it's oddly well balanced and somewhat comfortable. It's going to take some getting used to...but what the hell, it was fun. Last edited by WarMachine; 08-01-2009 at 10:56 AM. |
08-01-2009, 09:49 AM | #69 |
Rock Crawler Join Date: Feb 2008 Location: UK
Posts: 818
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Certainly the most unusual conversion that I've seen! Exactly what have you done, and how are the controls set up? I presume that you are using 2 Tx PCBs and 2 Rxs, but are you using both wheels? What about the triggers - 2 pots, or one pot feeding both PCBs? Are you using 16 AA cells? |
08-01-2009, 10:55 AM | #70 | |
Pebble Pounder Join Date: Feb 2009 Location: LeMars, Iowa
Posts: 158
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Pretty much spot on with what I did. 2 tx pcbs, and 2 rx. Channels 1,2,3 on tx/rx 1. Channels 4,5,6 on tx/rx 2. Tx1 trim on the right side Tx2 trim on the left side Ch 1: Right side wheel (front steering) Ch 4: Left side wheel (rear steering) Ch 2 & 5: Throttle via one pot (one or two esc) Ch 3: Thumb momentary set (dig unit) Ch 6: Finger tip momentary set (laser death ray gun) Eventually if I can find a suitable pot for the "mixed" throttles I'll separate them, but I haven't added the toggle switches for solo/mixed 2&5 yet. Just plain out got in a hurry to try it. Running it all off the 8 AA's in the bottom. The scope of this project (code name: Super Secret Project 6) was to make a useable 4 ch out of what I had laying around on the bench. The added bonus of 2 more channels opens up other possibilities down the road....or I'll shelf it and move on to Super Secret Project 7 (a whole different take on a controllers and CHEAP) | |
08-01-2009, 12:26 PM | #71 | |
Pebble Pounder Join Date: Aug 2008 Location: Spain
Posts: 103
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08-01-2009, 12:41 PM | #72 | |
Rock Crawler Join Date: Feb 2008 Location: UK
Posts: 818
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I need to find some miniature pots and suitable knobs. Are the trims in the HSP Tx suitable for re-use in the conversion? I've been googling for info on fitting a 3s LiPo. Most people say the Tx is fine with the slightly higher voltage. Once the HSP Tx arrives, I'll try and find a LiPo that fits. | |
08-01-2009, 02:30 PM | #73 | |
Pebble Pounder Join Date: Aug 2008 Location: Spain
Posts: 103
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I`ve find a mod to use only 4cells!!!. They say about 10hours working and no range trouble. IŽve troubles to understand correctly how to make the mod so I cannot try it. Later iŽll give you the link. They also say, that sometimes the PCB`s voltage regulator(7805) is not as good as must, so with this mod, the trouble is corrected. Cheers. | |
08-01-2009, 03:59 PM | #74 |
Pebble Pounder Join Date: Aug 2008 Location: Spain
Posts: 103
| Links: Post #783: http://www.rcgroups.com/forums/showt...967207&page=53 Post #1286: http://www.rcgroups.com/forums/showt...967207&page=86 Cheers |
08-01-2009, 05:14 PM | #75 |
Rock Crawler Join Date: Feb 2008 Location: UK
Posts: 818
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If I understand it correctly, the Tx takes the input from the 8 AA cells (between 9.6v and 12.8v, depending on the type of cell and the state of charge) and uses two 5v regulators to drop the voltage. The mod converts the battery box to use 4 cells, supplying between 4.8v and 6.4v. The two regulators are disabled by shorting the input to the output. The circuits now run directly on the battery voltage. There appear to be 2 versions of the mod. One bypasses each regulator individually. The other bypasses one regulator, then feeds it's output (which is shorted to it's input) to the output of the other regulator. The LED appears to alter the sensitivity of the low-voltage warning LED. If I had a spare Tx, I'd try this mod. I'm wary of risking my only Tx. |
08-01-2009, 05:49 PM | #76 | |
Pebble Pounder Join Date: Aug 2008 Location: Spain
Posts: 103
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I've a couple of TX here waiting for building to pistol, so I'm going to try it. If it works would be wonderful!. Cheers | |
08-01-2009, 05:57 PM | #77 |
Rock Crawler Join Date: Feb 2008 Location: UK
Posts: 818
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08-01-2009, 06:22 PM | #78 |
Pebble Pounder Join Date: Aug 2008 Location: Spain
Posts: 103
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WORKING!!!! Uploading pics & vid............. |
08-01-2009, 06:39 PM | #79 |
Pebble Pounder Join Date: Aug 2008 Location: Spain
Posts: 103
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Pics of voltage regulators bypassed: Batery box modified to solder the positive wire properly: And the vid of TX working after the Mod: http://www.youtube.com/watch?v=rmBsZzEZnnM I'm very happy! |
08-02-2009, 01:11 AM | #80 |
Rock Crawler Join Date: Feb 2008 Location: UK
Posts: 818
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Great. Are you going to try adding the LED as well? Also, what type of cells did you use - I wonder if it works with cheap NiMH? |
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