If I have an external signal connected to a GPIO pin, what’s the best way to have a “when the pin goes high” hunk of scratch code? I found this: http://www.raspberrypi.org/
First thing to do is run ScratchGPIO and then look to see what sensor pins show up on the second last sensing block
You should see a load of pins – pin10,pin19,pin21 etc
All those pins are set as inputs (with a software pull up resistor so that they read 1 normally)
If you ground one of those pins, the sensor value should change to 0
Pins 11,12,13,15,16 and 18 are set as outputs so they don’t appear in the list
If you are using ScratchGPIO plus – then no pin is set to any state so,for instamce, you’ll need to say
broadcast config8in
to configure pin8 for input with a software pull-up resistor
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