R Th = R a || R b R Th = R a || R b R a R b Voltage Reference R pot = R a + R b V CC G = R b R a +R b R a R b Voltage Reference R pot = R a + R b V CC G = R b R a +R b 10 9 LED: Red LED: Red R d D i * LED = <v Th –1.5 V <R Th +R d *LED on if <v Th > 1.5 V LED: Green LED: Green R d D i * LED = <v Th –1.5 V <R Th +R d *LED on if <v Th > 1.5 V <R Th <R Th 3 4 R Th = 0 Ω R Th = 0 Ω Reference Reference COM COM Reference Reference COM COM 2 4 1 3 16.1 16.1 16.1 16.1 16.1 16.1 16.1 16.1