Re: BITX40- tune button- no output
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It's probably worth mentioning that the "free" A1 refers to the original BITX40 code. Line 146 in that code shows:
// #define ANALOG_KEYER (A1)
which is commented out. If you do use that pin for the purpose mentioned here, you should probably add the following line:
pinMode(ANALOG_KEYER, INPUT_PULLUP);
somewhere around line 683 after uncommenting the #define. If you are using Allard's code, he has already used A1 for the key. Steve's reference also shows this.
From: Steve Thatcher <stevep2p@...>
To: [email protected]
Sent: Friday, February 16, 2018 4:08 AM
Subject: Re: [BITX20] BITX40- tune button- no output
Thanks Mike, but according to ,?
CONNECTING A STRAIGHT MORSE KEY or 'TUNE' BUTTON:
A straight key (or external electronic keyer) can be connected to Raduino pin A1 (connector P1, brown wire). It is recommended to install a 1K series resistor to protect the Arduino input. When the key is up (open) pin A1 will be HIGH. When the key is down (closed, shorted to ground) pin A1 will be LOW, and a carrier will be transmitted.
You could also wire up a simple push button instead of connecting a morse key. The generated CW carrier can be used for tuning up your antenna. In that case please note that you will be transmitting a carrier at full duty cycle, therefore don't keep the tune button pressed for too long to prevent overheating the final!
Am I misunderstanding something here?? Aloha, Steve
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