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Author Topic: Arduino for Displaying Freq Icom-746  (Read 16280 times)

N8WCR

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Arduino for Displaying Freq Icom-746
« on: December 26, 2017, 11:15:54 AM »

Since the backlight went out on my 746, until I get it sent out to get fixed, I would like to use an arduino to display the freq and mode using CI-V, can someone point me in the right direction? Nothing fancy and beginner arduino user.
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LA9XNA

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RE: Arduino for Displaying Freq Icom-746
« Reply #1 on: December 27, 2017, 12:34:07 AM »

The simplest way to get a display for your rig is probably just to go for CAT control on your radio.
Control software can be a something free like FLdigi or similar, there are also software that can run under linux.

I have done some repairs of the 746 in the past. If it is the backlight that is causing the display to fail the fix is basically only to replace a transistor.
The original transistor (2sb1021) is a bit low rated (2A) for this use, we used to put in a 2,5A or 3A transistor as a replacement.

http://www.ka1mda.org/ham/homebrew/746/index.htm
If you go for this repair, instead of this bolt-on heatsink there are heatsinks that can be glued on with tape or two component epoxy.
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KG4RUL

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RE: Arduino for Displaying Freq Icom-746
« Reply #2 on: December 30, 2017, 09:17:58 AM »

This is definitely doable with an Arduino UNO.  I have done a similar application to control an Alinco DX-SR8T, HF transceiver.  The interface to the CI-V port would only need a diode and a resistor.  If you use a I2C display, that hookup is only four wires.  Here is the schematic: http://www.kg4rul.info/iCOM_CI-V_FreqDisplay_schem.jpg

I don't have any iCOM, HF radios so, you will have to work out the software yourself but, it should be fairly straightforward.
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N5KBP

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RE: Arduino for Displaying Freq Icom-746
« Reply #3 on: January 06, 2018, 12:29:08 PM »

Since the backlight went out on my 746, until I get it sent out to get fixed, I would like to use an arduino to display the freq and mode using CI-V, can someone point me in the right direction? Nothing fancy and beginner arduino user.

It could be done but it would be a whole lot easier to change out the 1 transistor that has failed in your LCD backlight power supply. I have fixed many of them. Takes less than an hour. The instructions are all over the net. I even compiled a pdf with very detailed instructions with pictures. My email is on QRZ. Send me an email and I'll shoot you the pdf.
Marty
N5KBP
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N5KBP

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RE: Arduino for Displaying Freq Icom-746
« Reply #4 on: January 06, 2018, 01:09:49 PM »

Since the backlight went out on my 746, until I get it sent out to get fixed, I would like to use an arduino to display the freq and mode using CI-V, can someone point me in the right direction? Nothing fancy and beginner arduino user.

If you really want to do it. Look at these 2 projects. they are much more complicated than what you are wanting to do but they should contain the code you are needing buried in them.

http://www.qsl.net/on7eq/projects/arduino_icom_ci-v_proxy.htm

http://www.ik5pwc.it/en/civ_remote_antenna_switch_5.html

I noticed in the second one the D_CIV module has the all important frequency decode code.

Hope this helps and good luck
Marty
N5KBP




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KH2BR

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RE: Arduino for Displaying Freq Icom-746
« Reply #5 on: January 16, 2018, 08:12:53 AM »

ham radio deluxe.
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