The circuit in Figure 1 uses a bicolor (red/green) LED to indicate the voltage measured with a set of three color pulses. The green, yellow, and red pulses indicate the units, decimal point, and decimals of volt, respectively. The circuit is based on the 8-pin MCU PIC 12F683. It requires only two I/O lines to display a voltage reading with a resolution of 0.1 V...
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