Once again Jean-Jacques De Rey, ON7EQ brings us another excellent project that finds synergy between the Arduino development platform and the world of amateur radio. In this example he has designed and build an antenna tuner for his 20/40m end-fed half-wave antenna, that can be interfaced for control by and used with his Icom IC7000 transceiver.
The Arduino is used to interpret commands from the transceiver - including SWR data from the inbuilt meter on the Icom, and uses a rotational servo to adjust the variable capacitor in the tuner. Then the tuner works through the entire range of the capacitor, noting the SWR levels and then returns to the best point in the adjustment.
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