RCCrawler Forums

roktoy · 04-13-2008, 11:56 PM

I'd make sure you have a decent quality switch and that you have no cold solder joints.
Jay

Mikey007 · 04-14-2008, 03:38 PM

Thanx for the suggestions Jay! It seems to quit when I have the antenna extended all the way........I'm thinking a cold solder joint somewhere.

grommit327 · 04-24-2008, 02:20 PM

Alright...finally got my VF unit installed and started playing with the settings. Looks like the EPA's actually trim the third channel when set up this way with push buttons. Maybe time to give in to that pretty lookin DX3R that's been callin my name

TLTCrawlin · 01-26-2009, 11:36 PM

Is it possible to wire a 2 push button switches to a MX3.
You hold one button it turns servo left (front or rear dig)
You hold the other button it turns servo right (front or rear dig)
Dont touch any button and the servo is centered (4wd)

roktoy · 01-28-2009, 12:09 AM

Quote:

Originally Posted by TLTCrawlin

Is it possible to wire a 2 push button switches to a MX3.
You hold one button it turns servo left (front or rear dig)
You hold the other button it turns servo right (front or rear dig)
Dont touch any button and the servo is centered (4wd)

Ok, try this. You really want a Stage 1 mod but using two pushbuttons in place of the toggle switch.

For this setup, we want the input node sitting at 2.5V (servo centered). Two push buttons are used.
Pressing Button 1 changes the node to 5V (servo full left). Pressing Button 2 grounds the node and
moves the servo full right.

You have to add in the 10k resistor in blue to center the servo (~2.5V) when neither button is pressed.

You can change the added resistor value if you want a different mid-point voltage or change to
a potentiometer if you want an adjustable mid-point setting.

Let me know if this works ok for you.
Jay

TLTCrawlin · 01-28-2009, 12:29 AM

Thanks alot buddy, It should be here in day now, bought my MX3 a few days ago. Ill let ya know.

roktoy · 01-29-2009, 08:06 AM

Also, for that application, the AUX channel (3rd channel) EPA can be set 0 to 150%.

Manual here:

http://www.airtronics.net/manual/MX-3Manual.pdf

Jay

DRCMAN · 03-02-2009, 09:31 AM

Does anyone know if this mod works ok on the MX-3 FHSS?

Don't want to butcher it

SDheavymetal · 11-22-2009, 10:44 PM

When I put 2.5v to the input and it wont center the servo. To get 2.5v I had to use 5k ohm resistor. I used a potentiometer. I can never get it to center. I have a 2.4 Airtronics sport radio. I was thinking of using a PWM dimmer. Do you think that would work. Anyone know where I could get one? They use them for LED lighting. Something cheap. Matt

roktoy · 11-22-2009, 11:08 PM

Quote:

Originally Posted by SDheavymetal

When I put 2.5v to the input and it wont center the servo. To get 2.5v I had to use 5k ohm resistor. I used a potentiometer. I can never get it to center. I have a 2.4 Airtronics sport radio. I was thinking of using a PWM dimmer. Do you think that would work. Anyone know where I could get one? They use them for LED lighting. Something cheep. Matt

Which configuration are you trying to setup?

Not sure what you're trying to do with the PWM dimmer.

Jay

SDheavymetal · 11-22-2009, 11:58 PM

For a DIG set up. Was using 2 switches. I only have full right and full left.
0 volts left-this works
2.5v middle/centered. (its takes 5k to get 2.5v but won't center)
5v right-this works
Removed the switch from the board.
(I used a potentiometer to get the 2.5 volts-The 10k wasn't getting 2.5v)
The potentiometer is tempory just to get the 2.5v.
With the 2.5v I can't get the servo to center. I though Maybe its was is some weird thing with the 2.4Hz. Maybe a PWM switch would center it?
I jumpers wires all over the place to get it to work.
-On the circuit board the top hole is neg-bottom hole is the 5v. I'm using the bottom hole to get the 5 volts. If jumper the bottom hole 5v to the top hole ground the servo moves al the way. Can't seem to get the center (to input)hole to work. Maybe that the problem. In your picture all your wires are differant colors the group of wires. Mine are all white. Thanks

roktoy · 11-24-2009, 07:07 AM

Quote:

Originally Posted by SDheavymetal

For a DIG set up. Was using 2 switches. I only have full right and full left.
0 volts left-this works
2.5v middle/centered. (its takes 5k to get 2.5v but won't center)
5v right-this works
Removed the switch from the board.
(I used a potentiometer to get the 2.5 volts-The 10k wasn't getting 2.5v)
The potentiometer is tempory just to get the 2.5v.
With the 2.5v I can't get the servo to center. I though Maybe its was is some weird thing with the 2.4Hz. Maybe a PWM switch would center it?
I jumpers wires all over the place to get it to work.
-On the circuit board the top hole is neg-bottom hole is the 5v. I'm using the bottom hole to get the 5 volts. If jumper the bottom hole 5v to the top hole ground the servo moves al the way. Can't seem to get the center (to input)hole to work. Maybe that the problem. In your picture all your wires are differant colors the group of wires. Mine are all white. Thanks

Maybe the circuit board has changed and the input node is not the same location ??

Jay

SDheavymetal · 11-25-2009, 06:41 PM

Jay-
The top hole is negative. The bottom hole is 5 volts. I assume the middle hole is the input node. So I should ground the center hole? I will pull apart tonight and mess with it agian.

Is the center hole the input node on the other Airtronics radios?
Matt

SDheavymetal · 11-25-2009, 08:55 PM

Spent 2 more hours on the Radio and can't make it work. I wired in a potentiometer from the input node to ground. When I turn it more then half way the servo will 90 deg. Oh well I tried. The radio is a 2.4 Airtronics sport 3 channel. If someone figures it out post it. Maybe a PWM dimmer switch would do it? Set the switch for half way and connect a switch to that. Matt

roktoy · 11-25-2009, 09:09 PM

Quote:

Originally Posted by SDheavymetal

Jay-
The top hole is negative. The bottom hole is 5 volts. I assume the middle hole is the input node. So I should ground the center hole? I will pull apart tonight and mess with it agian.

Is the center hole the input node on the other Airtronics radios?
Matt

I assume you mean the center switch hole.....yes, goes to IC input.
Jay

roktoy · 11-25-2009, 09:11 PM

Quote:

Originally Posted by SDheavymetal

Spent 2 more hours on the Radio and can't make it work. I wired in a potentiometer from the input node to ground. When I turn it more then half way the servo will 90 deg. Oh well I tried. The radio is a 2.4 Airtronics sport 3 channel. If someone figures it out post it. Maybe a PWM dimmer switch would do it? Set the switch for half way and connect a switch to that. Matt

Got any pics or diagrams of what you're working with?
Jay

SDheavymetal · 11-25-2009, 09:20 PM

Just put it back together. Maybe latter this weekend I will take some pictures. I will use it for 4X4 and dig only for now for the 2 positions.

SDheavymetal · 11-27-2009, 01:11 PM

Here is the picture. R19 is a 200 ohm resitor. The hole I soldered the wire to is connected to the hole above it. The hole I used to solder the black wire to the board has 5v and the hole above has 5v. The 2 holes above those are grounds.

roktoy · 11-27-2009, 08:10 PM

Quote:

Originally Posted by SDheavymetal

Here is the picture. R19 is a 200 ohm resitor. The hole I soldered the wire to is connected to the hole above it. The hole I used to solder the black wire to the board has 5v and the hole above has 5v. The 2 holes above those are grounds.

Looks like right now you just have one switch wired in?....can't see as it/they is/are out of the photo.

Here is what I think I understand (photo). I don't quite understand what R19 is hooked to.
I assume your ?? wire connects to the IC input?

Jay

SDheavymetal · 11-27-2009, 08:29 PM

Thats my problem I'm not sure if it is the input. The ?? marks are the ground I tied into. I removed the other switch. Wired it like the #84 post.

The R19 is in the circuit that the black wire I installed with 5 volts.

Should the input have 5 volts? There seems to be no middle input.

The 2 grounds are attached and the 2 5 volts are attached together.

01-29-2009, 08:06 AM	#107
roktoy Dirt Addict Join Date: Jan 2004 Location: Stumblin' thru the parking lot of an invisible 7-Eleven Posts: 1,053	Also, for that application, the AUX channel (3rd channel) EPA can be set 0 to 150%. Manual here: http://www.airtronics.net/manual/MX-3Manual.pdf Jay Last edited by roktoy; 01-29-2009 at 08:10 AM.

03-02-2009, 09:31 AM	#108
DRCMAN Quarry Creeper Join Date: Apr 2006 Location: Pittsburgh Posts: 412	Mx-3 fhss Does anyone know if this mod works ok on the MX-3 FHSS? Don't want to butcher it

11-22-2009, 10:44 PM	#109
SDheavymetal RCC Addict Join Date: Jul 2008 Location: San Diego Posts: 1,144	When I put 2.5v to the input and it wont center the servo. To get 2.5v I had to use 5k ohm resistor. I used a potentiometer. I can never get it to center. I have a 2.4 Airtronics sport radio. I was thinking of using a PWM dimmer. Do you think that would work. Anyone know where I could get one? They use them for LED lighting. Something cheap. Matt Last edited by SDheavymetal; 11-22-2009 at 11:59 PM. Reason: spelling

11-25-2009, 08:55 PM	#114
SDheavymetal RCC Addict Join Date: Jul 2008 Location: San Diego Posts: 1,144	Spent 2 more hours on the Radio and can't make it work. I wired in a potentiometer from the input node to ground. When I turn it more then half way the servo will 90 deg. Oh well I tried. The radio is a 2.4 Airtronics sport 3 channel. If someone figures it out post it. Maybe a PWM dimmer switch would do it? Set the switch for half way and connect a switch to that. Matt Last edited by SDheavymetal; 11-25-2009 at 08:58 PM.

11-27-2009, 01:11 PM	#118
SDheavymetal RCC Addict Join Date: Jul 2008 Location: San Diego Posts: 1,144	Here is the picture. R19 is a 200 ohm resitor. The hole I soldered the wire to is connected to the hole above it. The hole I used to solder the black wire to the board has 5v and the hole above has 5v. The 2 holes above those are grounds. Last edited by SDheavymetal; 11-27-2009 at 01:50 PM.

04-13-2008, 11:56 PM	#101
roktoy Dirt Addict Join Date: Jan 2004 Location: Stumblin' thru the parking lot of an invisible 7-Eleven Posts: 1,053	I'd make sure you have a decent quality switch and that you have no cold solder joints. Jay

04-14-2008, 03:38 PM	#102
Mikey007 Pebble Pounder Join Date: Feb 2004 Location: Manitoba, Canada! Posts: 187	Thanx for the suggestions Jay! It seems to quit when I have the antenna extended all the way........I'm thinking a cold solder joint somewhere.

04-24-2008, 02:20 PM	#103
grommit327 Newbie Join Date: Jan 2008 Location: Da Shoug, WA Posts: 46	Alright...finally got my VF unit installed and started playing with the settings. Looks like the EPA's actually trim the third channel when set up this way with push buttons. Maybe time to give in to that pretty lookin DX3R that's been callin my name

01-26-2009, 11:36 PM	#104
TLTCrawlin I wanna be Dave Join Date: Apr 2005 Location: Eastern WA Posts: 2,489	Is it possible to wire a 2 push button switches to a MX3. You hold one button it turns servo left (front or rear dig) You hold the other button it turns servo right (front or rear dig) Dont touch any button and the servo is centered (4wd)

01-28-2009, 12:29 AM	#106
TLTCrawlin I wanna be Dave Join Date: Apr 2005 Location: Eastern WA Posts: 2,489	Thanks alot buddy, It should be here in day now, bought my MX3 a few days ago. Ill let ya know.

11-22-2009, 11:58 PM	#111
SDheavymetal RCC Addict Join Date: Jul 2008 Location: San Diego Posts: 1,144	For a DIG set up. Was using 2 switches. I only have full right and full left. 0 volts left-this works 2.5v middle/centered. (its takes 5k to get 2.5v but won't center) 5v right-this works Removed the switch from the board. (I used a potentiometer to get the 2.5 volts-The 10k wasn't getting 2.5v) The potentiometer is tempory just to get the 2.5v. With the 2.5v I can't get the servo to center. I though Maybe its was is some weird thing with the 2.4Hz. Maybe a PWM switch would center it? I jumpers wires all over the place to get it to work. -On the circuit board the top hole is neg-bottom hole is the 5v. I'm using the bottom hole to get the 5 volts. If jumper the bottom hole 5v to the top hole ground the servo moves al the way. Can't seem to get the center (to input)hole to work. Maybe that the problem. In your picture all your wires are differant colors the group of wires. Mine are all white. Thanks

11-25-2009, 06:41 PM	#113
SDheavymetal RCC Addict Join Date: Jul 2008 Location: San Diego Posts: 1,144	Jay- The top hole is negative. The bottom hole is 5 volts. I assume the middle hole is the input node. So I should ground the center hole? I will pull apart tonight and mess with it agian. Is the center hole the input node on the other Airtronics radios? Matt

11-25-2009, 09:20 PM	#117
SDheavymetal RCC Addict Join Date: Jul 2008 Location: San Diego Posts: 1,144	Just put it back together. Maybe latter this weekend I will take some pictures. I will use it for 4X4 and dig only for now for the 2 positions.

11-27-2009, 08:29 PM	#120
SDheavymetal RCC Addict Join Date: Jul 2008 Location: San Diego Posts: 1,144	Thats my problem I'm not sure if it is the input. The ?? marks are the ground I tied into. I removed the other switch. Wired it like the #84 post. The R19 is in the circuit that the black wire I installed with 5 volts. Should the input have 5 volts? There seems to be no middle input. The 2 grounds are attached and the 2 5 volts are attached together.

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