Re: - W8TEE board and pin connections
|
Jack Purdum
The PCB schematic has been posted, but I've reattached it here. If you look on the upper-left corner of the PCB, you will see OUT2 and GND (yellow header). That is the buffered output of the VFO and is the one I'm using for the BITX40. I'm using RG174 to route the signal to the BITX40 board. The set of pins next to it is labeled OUT below the header pins, which bypasses U2. If you locate C1 and C3 on the PCB, it's easy to see how they relate to the schematic. Because the AD9850 can produce a square wave, we brought that out to the set of pins at the right side of that header strip for anyone who might want to experiment with the board. The encoder pinouts for the Clock and Data lines are on the header to the right of the OUT's on the board and are silk screened (A = ?CLK, B = DAT, and S = SW). It's a little hard to see these in the photo, but look towards the center of the forest of header pins at the top. The 'S' is for the encoder switch. This assumes you are using an encoder with a switch (e.g., KY-040 family). Other than the output from the VFO and POWER, the rest of the connections are as the standard BITX40 works. If you want to use the CW features, TONEPIN is set to pin 11 and that needs to be connected to the speaker through a dropping resistor (e.g., 220-840 ohm). The TONEPIN is defined in the MorseCode.h header file which is part of the project. (I'm not happy with MorseCode.h as it contains function definitions, which properly belong in a *.cpp file.) ?If you disconnect power to the PA, you can use the B40 as a code practice oscillator. DITPIN and DAHPIN are currently set to pins 35 and 37 but may be changed if you want to move them somewhere else.? Power to the board is supplied via the PWR pins visible in the lower-right corner of the board. It is assumed that the DC input voltage is 9-12V. That is routed through the VR_MINI_360 buck converter that you see silk screened onto the board. It supplies the voltage to the PCB, Mega 2560 Pro Mini, AD9850. The 5V-GND set appearing at the top-right of the board is taken from the Mega board, so don't exceed the power draw of the Mega. The board "plugs into" the TFT display, which would be "underneath" the board in the photo. Right now I'm trying to make up an I/O pin assignment table showing Allard's pins versus my pins to insure they don't conflict. I cannot confirm this yet, but some of Allard's features should be able to be ported to my code, which is why I'm trying not to conflict with his code. Right now, I feel like the guy charged to drain the swamp while alligators are nipping at his butt. When I'm done, I'll likely move some of Allard's code into mine so there is a consistent code behind both with respect to the feature set.? I hope this helps. Stay tuned... Jack, W8TEE From: DJ4MU <pbepler@...> To: [email protected] Sent: Friday, July 14, 2017 5:09 AM Subject: Re: [BITX20] - W8TEE board Having successfully completed the build according to instructions I'm now looking for a Pin numbering of the outside headers as well as
wireup instructions for connecting to BitX board as i'm not sure what the connection marked SQR is intended for and do i use Out2 or Out for the BitX ?
and which additional peripherals are needed for the keyer function besides 3 pushbuttons, stereo Jack for the paddles , Speaker? and where to connect those.
did i somehow miss this or was it not posted yet?
|