Project Specific Tests: LED Bar

[computer-lov]

• [x] describes and justify tests
• [x] explain how to do them
• [x] explain what results were

[BeatrizPer]

• turn bars on for 4 seconds, hold, then turn off for 4 seconds

[BeatrizPer]

wrote code to turn LED Bar on, wiring seen below

[BeatrizPer]

import spidev import RPi.GPIO as GPIO import time from time import sleep

spi = spidev.SpiDev() dt = 0.4

def setup(): GPIO.setwarnings(False) GPIO.setmode(GPIO.BCM) GPIO.setup(14, GPIO.OUT) GPIO.setup(15, GPIO.OUT) spi.open(0,0) # SPI Port 0, Chip Select 0 spi.mode = 0b00 spi.max_speed_hz = 7629

def breathe_in(): spi.xfer([0b00000000]) GPIO.output(14, GPIO.LOW) GPIO.output(15, GPIO.LOW) sleep(2) spi.xfer([0b00000001]) sleep(dt) spi.xfer([0b00000011]) sleep(dt) spi.xfer([0b00000111]) sleep(dt) spi.xfer([0b00001111]) sleep(dt) spi.xfer([0b00011111]) sleep(dt) spi.xfer([0b00111111]) sleep(dt) spi.xfer([0b01111111]) sleep(dt) spi.xfer([0b11111111]) sleep(dt) GPIO.output(15, GPIO.HIGH) sleep(dt) GPIO.output(14, GPIO.HIGH)

def breathe_out(): sleep(2) GPIO.output(14, GPIO.LOW) sleep(dt) GPIO.output(15, GPIO.LOW) sleep(dt) spi.xfer([0b11111111]) sleep(dt) spi.xfer([0b01111111]) sleep(dt) spi.xfer([0b00111111]) sleep(dt) spi.xfer([0b00011111]) sleep(dt) spi.xfer([0b00001111]) sleep(dt) spi.xfer([0b00000111]) sleep(dt) spi.xfer([0b00000011]) sleep(dt) spi.xfer([0b00000001]) sleep(dt) spi.xfer([0b00000000]) sleep(dt)

while True: setup() breathe_in() breathe_out()

[BeatrizPer]

breathe_in() lights up LEDs by sending highs to the designated LEDs in order to create a guide to follow while inhaling. There is a time delay in between each LED being turned on. Its used by calling it breathe_out() turns off LEDs by sending lows to the designated LEDs in order to create a guide to follow while exhaling. It works by calling it. setup() sets up SPI and sets extra LED bars to GPIO pins since shift register allows 8 to be connected.

[BeatrizPer]

https://user-images.githubusercontent.com/98904988/156908646-37dd75b4-8da6-4936-a8ca-e77b1855348b.MOV

[BeatrizPer]

Project specific tests are done

[BeatrizPer]

Reviewed and done