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Old Feb 13, 2003, 10:53 PM
Registered User
Peotone,Il USA
Joined Oct 2000
100 Posts
Test plane .75oz, m20 hv geared, gws prop & 145ma
cell.
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Old Feb 14, 2003, 08:14 AM
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gbarc's Avatar
Jackson, Michigan, United States
Joined Nov 2002
1,388 Posts
I keep looking at the picture of Jberg's IRRX....it looks amazingly easy to put together.....is this true or am i just being wishful? I'm really interested in trying to put a system of my own together but i'm apprehensive especially in the areas of programming my own pic....is there anybody out there willing to make/sell me a simple two channel RX(rudder,throttle) and a TX or buddy box?



Greg
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Old Feb 14, 2003, 12:57 PM
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jberg's Avatar
MSC Rödinghausen, Germany
Joined Feb 2001
954 Posts
Greg,

yes, the ir rx is quite cheap and easy to build, compared to an rf rx. This was in fact the main reason (besides lightness, of course) why I started to deal with infrared stuff. Remember, the rx itself mostly consists of the sensors and one PIC processor (if you use 200 Ohm actuator coils).

Regards, Jochen
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Old Feb 14, 2003, 02:43 PM
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Ohio
Joined Mar 2000
138 Posts
Amp for 50 ohm coils

Quote:
Originally posted by joe price
receiver- 2 ch with dc-dc converter,amp for lower
resistance coils and fet
Slightly off-topic but what are the amps that we can use to drive lower resistance coils? PICs can only sink very low current and it is nice to be able to use DWE's 50 ohm coils with these IR receivers.

Any digikey or Mouser part numbers? What are we looking for, FET bridge chips?

- Vilas
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Last edited by Vilas; Feb 14, 2003 at 02:46 PM.
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Old Feb 14, 2003, 05:24 PM
Registered User
Peotone,Il USA
Joined Oct 2000
100 Posts
Vilas,
I'm using a dual single supply opamp made by
Analog Devices part number AD8532 it works down to
2.7 volts and will supply or sink 250ma,
8 lead soic package Allied or Newark electronics
no external parts required.
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Old Feb 14, 2003, 07:17 PM
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Ohio
Joined Mar 2000
138 Posts
Thanks Joe, this is very helpful. Now I could also add the op-amp to my Ztron IR receivers and use lower resistance actuators.
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Old Feb 16, 2003, 08:49 AM
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Zama city, Kanagawa, Japan
Joined Dec 2002
199 Posts
3ch version

I have completed to build 3 channel version which Koichi published.
I used 2 HS-50 servos and ESC to the unit.
Number of TX's LED are 55 and RX's photo IC are only 2.
I tryed it in the one basketball court size gym today.
There were no problems to fly.
This unit can use magnet actuator drivers instead of servos.
This 3ch receiver was welcomed by our team. There are 3 guys who already build this unit and some guys in Japan are waiting for the electronic parts now.
I believe Koichi's IR units might be a nice solution for builders of indoor/micro planes.
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Old Feb 16, 2003, 08:52 AM
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Zama city, Kanagawa, Japan
Joined Dec 2002
199 Posts
Another pic.


regards, Yoshi
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Old Feb 19, 2003, 02:40 PM
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Italy
Joined Dec 2002
40 Posts
koichi tx-rx code info

I download from koichi'site tx and rx schemes and hex files for futaba. Could someone give me schemes and hex files for Hitech Tx or tell me how to modify koichi's one? Thanx!
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Old Feb 19, 2003, 08:25 PM
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Koichi Tanaka's Avatar
Japan
Joined Dec 2002
327 Posts
AD8532

joe price,

I want you to teach how input and output of AD8532 opamp should be wired.

Regards,

Koichi
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Old Feb 19, 2003, 11:32 PM
Registered User
Peotone,Il USA
Joined Oct 2000
100 Posts
Koichi,

The 8532 is a dual opamp

tie pins 1 & 2 together, this is output to one
side of actuator coil.

tie pins 6 & 7 together, this is output to the
other side of actuator coil.

pin 3 input, connected to 12c509 pins 2 & 3

pin 5 input, connected to 12c509 pin 6 & 7

pin 4 neg supply (-)

pin 4 pos supply (+) does not need 5 volts from dc-dc converter connect to battery supply will
operate directly from battery 2.7 to 6 volts.

the ad8534 is a quad version if you if you need
a second channel.

hope this helps
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Old Feb 20, 2003, 12:06 AM
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Koichi Tanaka's Avatar
Japan
Joined Dec 2002
327 Posts
joe price,

I understand very well by your explanation.

I received MAX4016 of MAXIM instead of AD8532. Pin assignment is the same although there is little output current as 120mA.

The tested result is reported anew.

I appreciate your help.
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Old Feb 22, 2003, 07:46 PM
Registered User
Peotone,Il USA
Joined Oct 2000
100 Posts
Several people have inquired about using Hitec
transmitters instead of Futaba with Koichi's
infrared system i've compaired the channel assignments between the two.

Futaba channel 1 thottle
channel 2 elevator
channel 3 aileron

Hitec channel 1 aileron
channel 2 elevator
channel 3 throttle

As you can see they are not the same, Koichi's
code for the 12c509 is written for the Futaba
it will not function when used with Hitec.
Having said this if you still want to experiment
with IR you can visit his web site and check his
latest post it shows a decoder for use with servos
you can move the output connections around for
Hitec. This post has the hex codes along
with a drawing.
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Old Feb 22, 2003, 09:20 PM
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billystiltner's Avatar
United States, VA, Clintwood
Joined Nov 2002
3,666 Posts
Could you use a pic to make an rf reciever?
If so anyone know where to find info on how
to do it and the info about the transmiters
that needs to be decoded?
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Old Feb 22, 2003, 09:34 PM
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pmackenzie's Avatar
Toronto (Don Mills), Canada
Joined Dec 2002
17,093 Posts
PICs are used in RFFS, Skyhooks and Berg rcvrs (and probably others as well). They are used to decode the signal after it has been through all the RF circuitry. The advantage is that some digital filtering is possible.
Pat MacKenzie
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