ATMN251-W6-Review and Check ins

Happy Monday! How are you feeling today?

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Do you have any question or concern about the feedback you received on your project proposal?

How did you find the LAB 4 (LED and switches) assignment?

• challenging and interesting

• Difficult and overwhelming

• Easy and boring

What is the default voltage on pin 17 in the following circuit? What is the voltage when the switch is pressed?

We saw the following code in LAB 4 for a circuit in which the LED turned on by pressing the switch. The switch in this circuit was configured with internal pull up resistor. How would you modify this code for a switch with pull down resistor?

How much current can an individual GPIO drive safely?

• 16mA

• 50mA

• unlimited

• 100mA

How much current can all GPIO drive in total?

How much current does LED drive on pin 22 in the following circuit?

What is the voltage at GPIO pin with logic level 1 (HIGH)?

• 0V

• 5V

• 3.3V

• 12V

We know that even a small DC motor (3-5V) drives 300 - 400 mA initial current and then the current drops to 150-200mA as the motor speeds up. Do you think we can directly connect a small DC motor (5V) to the GPIO pin in RPi?

• why not? we can

• absolutely not!