Electricity & Magnetism - Download free content from MIT on iTunes - StumbleUpon. Electronic Goldmine - Electronic Components, Parts, Test Equipment, Kits,... - StumbleUpon. 10.2 A 4-bit Multiplier. Chapter start Previous page Next page This section presents a more complex VHDL example to motivate the study of the syntax and semantics of VHDL in the rest of this chapter. 10.2.1 An 8-bit Adder Table 10.1 shows a VHDL model for the full adder that we described in Section 2.6, "Datapath Logic Cells. " Table 10.2 shows a VHDL model for an 8-bit ripple-carry adder that uses eight instances of the full adder. 10.2.2 A Register Accumulator Table 10.3 shows a VHDL model for a positive-edge-triggered D flip-flop with an active-high asynchronous clear. Table 10.5 shows a model for a datapath multiplexer that consists of eight 2:1 multiplexers with a common select input (this select signal would normally be a control signal in a datapath). 10.2.3 Zero Detector Table 10.6 shows a model for a variable-width zero detector that accepts a bus of any width and will produce a single-bit output of '1' if all input bits are zero. 10.2.4 A Shift Register 10.2.5 A State Machine Stop when all bits of A are zero.
The Kinect-A-Sketch: A Homebrew Robotic Sketcher. This video from Waterloo Labs shows a bunch of young, excited interns building what amounts to a computer-controlled Etch-A-Sketch. The project uses an Xbox Kinect sensor to find the nearest point in space and then transmits that motion to an Arduino board which in turn controls stepper motors to turn the Etch-A-Sketch knobs. Sure you could just turn the knobs yourself, but where would the fun be in that? You can pick up an Arduino board and software for about $50 these days so these sorts of wacky homebrew projects are closer to everyday reality than you’d think. Considering the highest tech I ever got in school was building a balloon powered car, to have these resources at hand would be boon to science teachers everywhere. While you won’t be drawing the Mona Lisa with this thing, it’s a fun experiment and the video – after the gratuitous nerd intro – is pretty funny.
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