RF Power Meter display not working

摘要

I compiled the Wideband Arduino-based RF Power Meter software sketch OK (May-June 2020; siliconchip.com. au/ArticIe/14542l. But after building the unit up, the display just shows one line of white blocks. I've cycled the pot on the rear through its range, and no info appears. If I plug the IDE in via the USB/programming cable, and use the serial monitor, up comes the "Silicon Chip Digital RF Power Meter" splash, and then RF Pwr +-68.6dbm etc. So the sketch is working, but the display appears not to be.