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Unformatted text preview: Laboratory assignment five A loose approximation of cardiac pacemaker design EECS 203 Lab due on 10 Nov Prepared by Robert Dick after interviewing Alan Sahakian Please carefully review lecture four before starting this assignment. If you make catastrophic wiring mistakes, this could result in be exploding integrated circuits sending chunks of plastic into your forehead. In this laboratory assignment, you will be building an approximation of the control finite state machine for a cardiac pacemaker. Please show your work in your lab report. Figure 1: The human heart (from Henry Gray’s Anatomy of the Human Body , 1918) 1 Assignment Healthy human hearts contain electrical circuitry that periodically triggers and controls contraction of their upper chambers, atria or auricles, and lower chambers, ventricles (please see Figure 1). In some hearts, this control circuitry fails. Fortunately, we can replace it with a cardiac pacemaker. Please build a finite state machine based controller for a dual-chamber cardiac pacemaker. This device will periodically electrically stimulate the heart in order to trigger contraction. Your pacemaker will sit under the patient’s collar-bone. 1 inverted very bouncy signal clean signal Figure 2: Long time constant debouncer One of its barbed electrodes will be lodged in fibrous material (trabeculae) lining the inside of the right atrium. The other will be lodged in the right ventricle. In order to trigger contraction of the atria or ventricles, a 3 V potential isother will be lodged in the right ventricle....
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This note was uploaded on 01/12/2011 for the course EECS 203 taught by Professor Wu during the Winter '08 term at Northwestern.
- Winter '08