DK3PK
Simple SWR Display
DK3PK

The bar in the middle shows the SWR, the bar at the bottom the forward voltage (hence not really the power).
The supply current at 5V is only about 2mA.
The program is written in C and uses the avr-libc. Compile the program with the avr-gcc. The Makefile is only an example when using the avrdude and Atmels old AVR Starter Kit STK500.
swr-display-circuit.pdf
dircoupler.pdf
swr-bar2.c
Makefile