By Dietz P.H.
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Additional info for A Pragmatic Introduction to the Art of Electrical Engineering
Which segments to light, is sent for one digit, then the next, and the next, and so on. The same data lines are being used to transmit different data for the different digits at different times. Of course, we also have the switches for the commons which indicate which digit the data is for. But the key idea here is time division multiplexing - to reuse the same wire at different times to emulate multiple wires. Reducing this to its most minimal form, we could use a single signal wire (and a ground, of course) and somehow transmit all the required bits one after another.
Resistors of two different values are used: R and 2R. The volt2R V0 R V1 2R bit 0 R V2 2R bit 1 2R 2R bit 2 Stamp Outputs gnd age sources shown are the Stamp outputs. As part of your preparation for this lab, you will need to analyze this circuit. You should calculate V2 as a function of the Stamp outputs switching from 0V to 5V in the eight possible patterns. Hint: This circuit has some wonderful properties that make it very easy to analyze. Start at one end, and think parallel and series combinations.
Rent source is a horizontal line. If you think about this, that means that voltage sources are kind of similar to 0Ω resistors (a vertical I-V curve through the origin), and current sources are like infinite value resistors (a horizontal I-V curve through the origin). We’ll come back to this point later. In order to use your Stamp to create different voltages (your problem for the week), you will be combining several output pins into a single circuit. You could solve these circuits using the techniques we have already discussed.