Slide #1.

SE3910 Week 1, Class 3  Today   Continuing circuits Beaglebone safety & I/O  Week   2 Lab Quiz 1 – Circuits & BB safety Lab 2 – Circuits  Complete prelab before lab SE-2811 Slide design: Dr. Mark L. Hornick Content: Dr. Hornick Errors: Dr. Yoder 1
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Slide #2.

Beaglebone SE-3910 - Dr. Josiah Yoder Slide style: Dr. Hornick Much Material: Dr. Schilling 2
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Slide #3.

Beaglebone Black P8 and P9 headers  Our Favorites  BLUE: On BASIC PROTO CAPE 3
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Slide #4.

Finding GPIO Port ������ ��� ������= ��������������������∗32+������� (Useful on the basic proto cape) SE-3910 - Dr. Josiah Yoder Slide style: Dr. Hornick Much Material: Dr. Schilling 4
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Slide #5.

BASIC PROTO CAPE http://elinux.org/CircuitCo:Basic_Proto_Cape SE-2811 Dr.Yoder 5
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Slide #6.

The breadboard cape SE-3910 - Dr. Josiah Yoder Slide style: Dr. Hornick Much Material: Dr. Schilling 6
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Slide #7.

The breadboard cape ITM QTY REF PART 1 1 PCB 2 2 P1, P2 2x23 HDR FE 3 1 P3 8 PIN HDR FE 4 2 S1, S2 BUTTONS 5 2 D1, D2 LEDS 6 2 R1, R2 RESISTOR 7 1 BR1 BREADBOARD 8 1 JMPR WIRE KIT DESCRIPTION 2-LAYER 3.4" x 2.15" DUAL - STRAIGHT SOCKET STRIP .025" SQ. PINS CONN HEADER FEMALE 8 POS 0.1" GOLD SWITCH TACT SPST-NO .05A 24V LED GREEN 3MM 568NM 20mA 2.12V RES 470 OHM 1/4W 5% CF MINI WHT ADHSV SLDRLSS BRDBRD 170 TIE PT 1.8" x 1.37" 10 x 14 LNGTH .1" .2" .3" .4" .5" .6" .7" .8" .9" 1" 2" 3" 4" 5" SE-3910 - Dr. Josiah Yoder Slide style: Dr. Hornick Much Material: Dr. Schilling DISTR PART # MLE DK DK DK DK PLU SQR SSHQ-123-D-08-F-LF PPPC081LFBN-RC B3F-1000 WP7104SGC CFM14JT470R 1490 7
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Slide #8.

GPIO Input an Output  Take notes SE-2811 Dr.Yoder 8
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Slide #9.

Ex: What is the resistance of this resistor? 9
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Slide #10.

Ex: GPIO safety Considering the resistor on the previous slide, is it large enough to not damage a GPIO pin configured as output, if the resistor ties the output to 3.3V?  Sourcing limit: 4mA  Sinking limit: 8mA  Voltage: 3.3 V SE-2811 Dr.Yoder 10
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Slide #11.

Ex: What is the resistance of this resistor? 11
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Slide #12.

Ex: GPIO safety GPIO pins:  Sourcing limit: 4mA (current flowing out of BB)  Sinking limit: 8mA (current flowing in to BB)  Voltage: 3.3 V Considering the resistor on the previous slide, is it large enough to not damage a GPIO pin configured as output, if the resistor ties the output to ground? SE-2811 Dr.Yoder 12
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Slide #13.

Ex: What is the resistance of this resistor? 13
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Slide #14.

Exercise: Find all of:  Voltage from GPIO to ground if    S1 is closed S2 is closed Both are open  Current from source if both are closed SE-2811 Dr.Yoder 14
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Slide #15.

Ex: This circuit is an attempt to wire a GPIO pin as both an input and an output What happens if GPIO is an output with a value 1 and we press the switch? SE-3910 Dr.Yoder 15
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Slide #16.

References EB: Derek Malloy, Exploring Beaglebone, Wiley, 2015 SE-2811 Slide design: Dr. Mark L. Hornick Content: Dr. Hornick 16
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Slide #17.

The breadboard cape SE-3910 - Dr. Josiah Yoder Slide style: Dr. Hornick Much Material: Dr. Schilling 17
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Slide #18.

Spring 2017 Week 6, Day 1  Resistance  (high) https://books.google.com/ngrams vs. Impedance resistance input vs. (high) impedance input SE-2811 Dr.Yoder 18
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