HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Jan 19, 2002, 03:32 AM
Registered User
N. Staffs, UK
Joined Jan 1997
5,654 Posts
Help!
DIY Infra-red ?

Has anyone seen any circuits for building infra-red transmitters and receivers ? Last time I asked this question on Modeling Science several people told me it was really easy to do but no-one came up with any circuits or even detailed descriptions of how they work. E.g. do they use a carrier (what freqency 38KHz ?), is the encoder output simply "amplitude modulated" i.e. switched onto the carrier etc.

I like playing with electronics so I'm pretty sure I could design myself a system that would work but I'd prefer it to be compatible with existing receivers etc.

Steve
steve lewin is offline Find More Posts by steve lewin
Reply With Quote
Sign up now
to remove ads between posts
Old Jan 19, 2002, 04:16 AM
Registered User
Leicester England
Joined Jun 2001
591 Posts
DIY IR

I have never seen a circuit diagram, maybe because you have to program the pic chip anyway. I can supply you will the parts for the Z Tron system and you could make it from a kit if you like.
If you design your own you are reinventing the wheel, which is ok if thats your interest, but micro flight has lots of other problems sort out.
Also we are back to the problem of finding the parts in small quantities ...
Mark
aeronutz is offline Find More Posts by aeronutz
Reply With Quote
Old Jan 19, 2002, 04:43 AM
Registered User
jberg's Avatar
MSC Rödinghausen, Germany
Joined Feb 2001
954 Posts
Re: DIY IR

Mark,

Quote:
Originally posted by aeronutz
Also we are back to the problem of finding the parts in small quantities ...
Mark [/B]
try www.digikey.com , they have almost everything you can imagine, starting from very low quantities. Not cheap, but at least you get what you need.
jberg is offline Find More Posts by jberg
Reply With Quote
Old Jan 19, 2002, 01:22 PM
Registered User
Berkeley, CA USA
Joined Apr 2001
643 Posts
i'd suggest looking at the surplus places as well, like american science and surplus, and electronics goldmine.

if you know what parts you are looking for, maybe we can help you find them.
Mighty Mik is offline Find More Posts by Mighty Mik
Reply With Quote
Old Jan 19, 2002, 08:20 PM
Sticky Shepherd
Graham Stabler's Avatar
Oxford/England
Joined May 2001
4,017 Posts
As you Marks says if you can program a pic you can make the tx. It does use modulation but I can't remember the frequency. Also the ztron doesn't use quite the same pulse train as a std tx. So if you wanted it to work with ztron receivers you would have to find out the exact pulse format.

If you want to do it all yourself you could re-jig an rf tx just replacing the radio transmitter part with an oscillator to produce the correct modulation frequency for your ir receivers. This could then drive a mosfet switching an arrray of ir leds. This is a pretty cheap wat to do it but I think you would have to do your own rx as well and that involves some tricky pic programming.

People like digikey, farnell etc do have everything you can imagine but not necessarily the thing that you want. I have been looking for filters and other bits fro an rf receiver I'm working on and you just can't buy the ones I want. Even the samples I requested had to be specially made in japan. If I could afford a gram more on the design there would be no problems.

Graham
Graham Stabler is offline Find More Posts by Graham Stabler
Reply With Quote
Old Jan 19, 2002, 10:33 PM
Grand Poobah of Nothing
Trizza's Avatar
Once Australia, now Finland
Joined Feb 2001
1,022 Posts
I'm working on one right now. Post about it a page or so back on this forum. When its done I intend to release the software and the hardware (including the MCU programmer) design on my website.
It utilizes 2 AVR micro chips that retail about US$3 and an old computer joystick. Still in a very early stage so don't expect too much about it for a while. Still debugging and fine-tuning the code for a single channel, before I expand it to the planned 3 channels with channel reverse, electronic trim, and v-tail mixing.
Trizza is offline Find More Posts by Trizza
Reply With Quote
Old Jan 20, 2002, 03:51 AM
Registered User
N. Staffs, UK
Joined Jan 1997
5,654 Posts
Cheers Mark/Graham, I guess I'll just have to give up and buy some stuff. I tried that a while ago but it was impossible to get the transmitters from anywhere. That's the main reason I built a simple one of my own (using it with electric control line now cus the receiver is HEAVY !). Apparently FMA were going to sell the transmitters and then they weren't and Mr Z-tron wasn't answering any emails. Are they available again ?

Thanks Trizza, single channel would be fine for my electric C/L stuff which is also not so weight sensitive but you're right more channels are needed for micro r/c (remote control not radio).

But why AVRs ? I've only just about got to grips with PICs. I really don't want to have to learn my way round yet another microcontroller .

Steve
steve lewin is offline Find More Posts by steve lewin
Reply With Quote
Old Jan 20, 2002, 05:31 AM
Registered User
Leicester England
Joined Jun 2001
591 Posts
Good news

Steve - I have a spare Mk 3 Tx here if you are going to fly indoor one and two cells planes with it. If you want to fly control line then Z Tron have just made/are making a special Tx for that purpose, because you obviously dont need a standard Tx for three channels.
I have some Rx kits and coils too, let me know what sort of plane you want to fly and what size hall you have and I will advise on model size if you like.
I will post a new thread with regards to our latest two cells planes ....
Mark

ps Sergio told me he had 500 of the Mk 3 transmitter boxes and sold them all - so it migth be possibll to get one second hand and they where available for a couple of years but seemed interested then. We are still looking for a new supply of CHEAP Tx boxes that will be suitable.
aeronutz is offline Find More Posts by aeronutz
Last edited by aeronutz; Jan 20, 2002 at 05:33 AM.
Reply With Quote
Old Jan 21, 2002, 12:00 AM
Grand Poobah of Nothing
Trizza's Avatar
Once Australia, now Finland
Joined Feb 2001
1,022 Posts
AVRs are much better value for money - here the 18 pin pics are upwards of AU$15 each, whereas the 20-pin AVRs are AU$5 each. They have more memory, higher clock speeds, better instruction set (allowing even more program to be packed in), the IO pins are configurable either way, instead of some in some out like PICs seem to have, and besides, a very very easy programmer can be built for a couple of dollars. I'm a very price-minded person so I opted for the cheapest solution to getting into MCUs, and AVRs seemed to be just that.

Heck, for the price of an 18-pin PIC I can get the top of the range AVR without going into ATMEGA chips, the AT90S8535 (40 pins, a heap of ADC pins, 2 external interrupts, analog comparators, the lot).
I urge everyone to check em out, they're great.
Trizza is offline Find More Posts by Trizza
Reply With Quote
Old Dec 18, 2002, 11:51 PM
Registered User
Koichi Tanaka's Avatar
Japan
Joined Dec 2002
327 Posts
I am making and testing the infrared transmitter and the infrared receiver.
Transmitter Futaba'challenger' was converted.
A receiver is only 1.3g.
A DC/DC converter, a speed controller, and magnet actuator driver are contained in the receiver.
There are 130 feet or more of distance of operation.
PIC12C509A is used for the transmitter.
The charge pump DC/DC converter is used for the receiver with PIC12C509A and IRF7805 FET at it.
The test flight was successful in the gymnasium.

http://www.cityfujisawa.ne.jp/~toko/pic
Koichi Tanaka is offline Find More Posts by Koichi Tanaka
Last edited by Koichi Tanaka; Dec 19, 2002 at 01:51 AM.
Reply With Quote
Old Dec 20, 2002, 07:54 PM
Registered User
Koichi Tanaka's Avatar
Japan
Joined Dec 2002
327 Posts
The new infrared transmitting module was made.
It will test in a gymnasium tomorrow.
It uses setting to the trainer terminal of a transmitter.

Koichi Tanaka is offline Find More Posts by Koichi Tanaka
Reply With Quote
Old Dec 21, 2002, 12:21 AM
Registered User
Berkeley, CA USA
Joined Apr 2001
643 Posts
cool project. Put some of those buddy boxes to use.
Mighty Mik is offline Find More Posts by Mighty Mik
Reply With Quote
Old Dec 22, 2002, 06:58 PM
Registered User
Koichi Tanaka's Avatar
Japan
Joined Dec 2002
327 Posts
It flew in the gymnasium yesterday.

It flew satisfactory at all.

The weight of an airplane is 12.9g.

The airplane which set the infrared receiver, and the transmitter which set the infrared unit.
Koichi Tanaka is offline Find More Posts by Koichi Tanaka
Reply With Quote
Old Dec 22, 2002, 08:02 PM
in persuit of low wing loading
Gordon Johnson's Avatar
Boston, Mass
Joined May 2001
6,426 Posts
Koichi,
Very nice work on a IR that works off the buddy box plug in a standard TX. I think this is the way to go.

Could you give some more details on your plane? It looks like it is rudder and throttle. What was your wing area, what motor/gear/prop did you use. Anyway, very impressive.

Gordon
Gordon Johnson is offline Find More Posts by Gordon Johnson
Reply With Quote
Old Dec 22, 2002, 10:05 PM
Registered User
Koichi Tanaka's Avatar
Japan
Joined Dec 2002
327 Posts
It used the motor from DigiQ, having removed.
The weight of a motor is 0.7g.

The 1mm ball bearing is used for the driveshaft.
A gear is 81t and 9t of DiDel.
With the balsa propeller of 127mmx64mm, it is handmade.here is thrust which both exceeds 10g by 140 mAh Li-Poly.
A motor unit is fixed with a magnet.

Wingarea 4.47dm2, Wingspan 473mm, Length 495mm, Wingloading 2.9g/dm2.

Airframe 4.6g + Propulsion-unit 1.7g + prop 0.3g + IR combo receiver 1.5g + Magnet actuator 0.6g + 140mAh Li-Poly 4g + Other 0.2g = Total 12.9g.

Koichi Tanaka is offline Find More Posts by Koichi Tanaka
Last edited by Koichi Tanaka; Nov 04, 2005 at 07:41 PM.
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
airwars "infra-red combat system for planes" Tree_Magnet Power Systems 15 Jan 08, 2008 09:41 PM
Discussion DIY conversion to infra red Tom Harper Aerial Photography 46 Jun 25, 2006 05:43 PM
Infra-Red Thermometer for Helis rscamp Electric Heli Talk 7 Jan 08, 2002 06:11 AM
airwars "infra-red combat system for planes" Tree_Magnet Foamies (Kits) 4 Aug 02, 2001 12:15 AM
Infra red transmitter and receiver for micro size aircraft Ron MIller Power Systems 2 May 28, 2001 09:51 AM