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Victory is at hand.? PWR / SWR Meter is working.

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As I have suspected for a while the problem turned out to be the some combination of the Arduino board and the Wire library.? As Rafael suggested I loaded the ATTinyCore from Spence Konde but the problem remained - always -1 returned for FWD and REF power.? Perusing the Arduino support forum I was pointed to an alternative to the Wire library called TinyWire.? I loaded that and changed all the references from Wire to TinyWire and that worked.? Here are the details.

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1. IDE: Arduino IDE 2.3.2

2. Board Manager: ATtinyCore by Spence Konde, (NOTE - because of SSL certificate errors it doesn't currently load using the Arduino IDE board manager.? I had to search for a procedure to manually install it.)

3. Board Selected:? ATtinyCore -> ATtiny25/45/85 (No Bootloader)

4. Chip Selected:? ATtiny85

5. Programmer: Arduino as ISP? (I built a programmer using a spare Arduino Nano)

6. Install the the TinyWire library:

7. In swr_bridge.ino change all referencs to Wire to TinyWire and change: ?

TinyWire.write(message, 4);

to

TinyWire.send(message, 4);

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Compile, upload and be happy for the rest of the afternoon.

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I can't explain why ATtinyCore and Wire worked for Rafael.? I never did hear back from Farhan what the original build environment for the SWR bridge was.? The comments in the code refer to DIYTiny - I searched and found that one - it didn't work for me either.

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The Arduino ecosystem is terrific - unfortunately thre are so many people contributing board managers and libraries - some are great quality - some are marginal - but there is no authoritative place to go to find what works.

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73 and thanks for following along.

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Dean

KK4DAS