Pi LCD Shield buttonPressed() returns True on initialization

[collinmoerman]

The buttonPressed() function from Adafruit_CharLCDPlate is returning True immediately after initialization.

Program:

Code: Select all

#!/usr/bin/python

from time import sleep
from Adafruit_I2C import Adafruit_I2C
from Adafruit_MCP230xx import Adafruit_MCP230XX
from Adafruit_CharLCDPlate import Adafruit_CharLCDPlate

import smbus

#Using busnum = 1 for Pi v2
lcd = Adafruit_CharLCDPlate(busnum = 1)
lcd.clear()

while True:
print "LEFT:\t%s" % lcd.buttonPressed(lcd.LEFT)
print "RIGHT:\t%s" % lcd.buttonPressed(lcd.RIGHT)
print "UP:\t%s" % lcd.buttonPressed(lcd.UP)
print "DOWN:\t%s" % lcd.buttonPressed(lcd.DOWN)
print "SELECT:\t%s" % lcd.buttonPressed(lcd.SELECT)
sleep(.25)


Output:

Code: Select all

pi@raspberrypi:~/cdp$ sudo python button-test.py
LEFT:   True
RIGHT:  True
UP:     True
DOWN:   True
SELECT: True
LEFT:   True
RIGHT:  True
UP:     True
DOWN:   True
SELECT: True
LEFT:   True
RIGHT:  True
UP:     True
DOWN:   True
SELECT: True
LEFT:   True
RIGHT:  True
UP:     True
DOWN:   True
SELECT: True
LEFT:   True
RIGHT:  True
UP:     True
DOWN:   True
SELECT: True
LEFT:   True
RIGHT:  True
UP:     True
DOWN:   True
SELECT: True
^CTraceback (most recent call last):
  File "button-test.py", line 20, in <module>
    sleep(.25)
KeyboardInterrupt


I am not holding down the buttons, If I press a button it stays True, so it's not just inverting True and False.

[fidelite]

I just ran the same script on my new LCD Pi Plate on a version 2 rpi, and it reports false until I actually push a button. Sounds like a hardware issue.