Need help building a mixer

[juicedcbr600f2]

HELP!

I am building a project for my father, an rc OV-1 Mohawk (BH Models) and had some questions. I am looking for a way to mix the flaps and ailerons for inboard flaperons. I am using the DX6i and i know it can do mixing in the radio but i am limited to 2 different mixes and using one of thost mixes for the flaps alone (because of the servo setup) and am out of channels to do it on the TX.

I am also looking for plans for a differential mixer for the throttles because there is no rudder, and cant do this out of the Tx because im out of channels.

any help or if i could pay someone to make me some ixers that would be awesome or plans would be great too. I am a total newb at electronics like that but am very quick to pick things up and learn.

thanks in advance.

- Justin

[jppizhere]

This would be a perfect job for a microcontroller or two. The amount of electronics knowledge involved in using a microchip is fairly minimal, but you would need to learn some programming. I personally prefer Picaxe microcontroller because you can program them in BASIC and they require no expensive programmmer, but they do have limitations. Others will say use a pic or avr, all personal preference I suppose.

Differential throttle should be really simple, read input for the throttle channel and simply pass it through while adding or subtacting from the output using a ratio based on the rudder channel. The most difficult part in my opinion would be finding the correct ratio between rudder and throttle change and I would think would require some expermentaion to get it correct.

Flapernons should actually be a little more straightforward, read aileron channel and make equal mathmatical changes to flap channel.

I can help you out with circuit and programming for this if intrested.

[Iflyj3]

Save yourself time and money and buy a transmitter with more function.

[Ron van Sommeren]

Isn't this a hobby forum?

[bamoore01]

Yes it is a hobby forum, but don't forget that some peoples hobby is to buy more equipment. Not saying that's a bad way to go.

Lots of different ways to do this but I like to use one of the 8 pin PICS with a basic compiler/programming environment by Oshonsoft.com (PIC Simulator IDE). It already has the servo routines for reading and writing built in. You can pretty much do a single 8 pin DIP solution (with a cap from power to ground if you want to get fancy). After using two of the pins for power and ground, you have 6 pins to use for inputs or outputs. Very small and light. The down side is you have to know some basic programming and have to learn how to download a program to the chip. Not hard, just takes some time and a little cash. $3.00 for the chip, ~$45. for the software and ~$20 for a programmer board.

[Iflyj3]

Isn't this a hobby forum?
Yes it is a hobby. But when he said he was limited on electronics knowledge and he was willing to pay someone to develop it for him, that removes that part from being a hobby.

If he pays someone to do it for him he will have to spend a lot more than the money it would take to upgrade to the next level transmitter. Custom development of a hardware/software project will run anywhere from $75 to $200 per hour.

Over the years I have spent more money trying to save money on a project than I care to discuss. I made my comments from actual experience and not guess work.

[Ron van Sommeren]

You're right, I missed that part.