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Digital Electronics, Software and Hardware

Digital Electronics, Software and Hardware. K. A. Connor Mobile Studio Project Center for Mobile Hands-On STEM LESA Engineering Research Center ECSE Department Rensselaer Polytechnic Institute. Outline. Digital Static I/O with Analog Discovery Photocell Light Sensor Circuit TTL Gates

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Digital Electronics, Software and Hardware

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  1. Digital Electronics,Software and Hardware K. A. Connor Mobile Studio Project Center for Mobile Hands-On STEM LESA Engineering Research Center ECSE Department Rensselaer Polytechnic Institute

  2. Outline • Digital Static I/O with Analog Discovery • Photocell LightSensor Circuit • TTL Gates • PWM from Digital Output

  3. Static I/O • 16 Channels • Configuration • Input • Output • Right Click Channel • LED for Output • Switch for Input • Config – Bit I/O

  4. Photocell Sensor A Photocell is a resistor whose value reduces with increasing light levels • Photocell • Voltage Divider • Fixed R Meas. • Photocell Meas. • Fixed Resistor chosen to achieve maximum range of measured voltages. Very common sensor for Arduinos and other processors

  5. TTL Gates Transistor–transistor logic (TTL) is a class of digital circuits built from bipolar junction transistors (BJT) and resistors. TTL NAND Gate Truth Table Experiment

  6. PWM from Digital Output • Previously used PWM from Analog Discovery function generator (W1 or W2) • All 16 Digital I/O Channels can also provide a PWM signal • Many more channels and • Can be controlled by and a key part of a fully digital system and, thus, generally more flexibly, if not necessarily more easily, programmed.

  7. Functional Blocks Generic Circuit System • Source (voltage plus resistance, as in Thevenin Equivalent) • Intermediate Circuit (characterized by a transfer function … filter, amplifier, etc.) • Load (resistance, capacitance, inductance or combination) Source Transfer Function Load

  8. Adding Functional Blocks • Adding Functional Blocks to a Circuit can Radically Change What the Circuit Does • Potential Issues • Check input and output impedances to be sure independent functions work together • Check input and output voltage, current, power to be sure that they are adequate • Voltage Divider Video 6.1 (Designing Circuits from Functional Blocks)

  9. Ready for Next Experiment • All systems in place • Sensor (Photocell) • Processor (Analog Discovery) • Actuator (LED) • Model for other systems

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