I've probably used the wrong term - I'm thinking of what I do when writing PLC code - so I can't find how to do this in my reference books. This is part of a project I'm working on with a Raspberry Pi and an MCP23017 port expander. I have a N/O pushbutton that I want to "latch" a value to a variable when it's been pressed. I have this function that gets called periodically in a 'while True' statement:
def button(): pushbutton = 0 button_value = 0 pushbutton=bus.read_byte_data(address,GPIOB) if pushbutton > 0: button_value = 1 return button_value I need button_value to become '1' when the button is pressed and to remain '1' until the entire program (only about 25 lines) ends with a sys.exit() What do I use to 'latch' button_value? Brian Grawburg North Carolina -- The truth will set you free . . .but first it will infuriate you. -- https://mail.python.org/mailman/listinfo/python-list
