ESE 5190 - Lab2b Expansion Board Proposal

This is the overview for the proposal for the expansion board.

Video of the Protoboard:

Proposal_New.mp4

OLD Proposal:

Lab2B_ESP.mp4

Plan Outline

We plan to light 2 separate LEDs on our Breadboard using the RP20240 board. Two different LEDs will glow based on the input enetered by the user on the keyboard. When the C key is pressed, the Green LED lights up. When the D key is pressed, the Blue LED lights up. We use serial communication for controlling our LED this way. The SCL1 and SDA1 pins of the Adafruit QTPy RP2040 are conneted to the GPIO23 and GPIO22 pins respectively. This is evident from the RP2040 pinout diagram shown below.

The Link for this documentation is: RP2040_Pinout

We are using the GPIO pins to control our LEDs. We have intitialized the GPIO22 and GPIO23 pins using the gpio_init and gpio_det_dir functions. The user input is being read using the getchar_timeout_us(5000), which returns a character from stdin if available. When C is pressed, the message "GREEN SHOULD BE ON" is printed on the Serial Output, and the Green LED lights up. When D is pressed, the message "BLUE SHOULD BE ON" is printed on the Serial Output, and the Blue LED lights up. We drive the GPIO pins High and LOW using the gpio_put functions.

This project can be extended to be used as a Password Authenticator in lockers, where you will be granted access whenever the right password is entered.

Components Used:

• Breadboard
• STEMMA QT Cable
• 1k ohm and 100 ohm Resistors
• Blue LED
• Green LED
• Adafruit QTPy: RP2040