Figure 1: Microcontroller U2 controls a low-power dc motor using the quad-SPST analog switch U1. Microcontroller U2, by controlling the four digital switch-control inputs of U1 (IN1 through IN4), ...

The design in Figure 1 obviates the shortcomings of these approaches and uses only one port line to drive an eight-segment bar graph. This design does not use a PWM output and hence can apply to any ...