Here’s some help on the assignment due on Monday.

The entire set uses three different integrated circuit (IC) components (see image 3 below)

  • IRF540: A MOSFET/Power Transistor; used to turn DC actuators on and off
  • L7805: +5V Voltage Regulator, used step-down the power-supply (>5V) to 5V for a servo
  • LD33V: +3.3V Voltage Regulator, used to setp-down the power-supply voltage (>5V) to 3.3V for a small solenoid
NOTE: while both the L7805 and the LD33V are “voltage regulators”, their pin-ordering is different; look at the datasheet!

Image 1 below shows a breadboard circuit for connecting the Teensy microcontroller to (letters refer to image 2 below)

  • A: 1 x 3.3V solenoid (needs 1 x LD33V 3.3V Voltage Regulator and 1 x IRF540 MOSFET)
  • B: 1 x Servo (needs 1 x L7805CV +5V Voltage Regulator)
  • C: 1 x 12V solenoid (needs 1 x IRF 540 MOSFET) [image 6]
  • D: 1 x 12V incandescent light bulb (needs  1 x IRF 540 MOSFETS) [image 6]
  • E: 1 x 12V RGB LED strip (needs 3 x IRF 540 MOSFETS) [image 7]
  • F: 3 x photoresistors (needs photoresistor and resistor) [image 8]
NOTE: The two vertical strips of the breadboard are used to distribute GROUND (common for Teensy and Power Supply), and the two different supply voltages (one from Teensy, one from Power supply); please see image 4 below.

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