27 lines
820 B
Markdown
27 lines
820 B
Markdown
#Raspberry Pi Dots
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###Dots is a Dot to Dot HAT board for the Raspberry Pi that lets you join-the-dots with BARE Conductive Paint!
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Every Dot on the Dots board is a "floating" metal contact just waiting to be pulled down to ground with a dab of paint.
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To read a Dot you should set its corresponding pin as an INPUT and make sure it's pulled up like so:
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```python
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import RPi.GPIO as GPIO
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GPIO.setmode(GPIO.BCM )
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GPIO.setup(dot_pin, GPIO.IN, GPIO.PUD_UP)
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state = GPIO.input(dot_pin)
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```
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It's good practise to only turn on the PULLUP when you actually want to read the Dot, so a method like
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this is recommended for reading:
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```python
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def is_dot_connected(dot_pin):
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GPIO.setup(dot_pin, GPIO.IN, GPIO.PUD_UP)
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state = GPIO.input( dot_pin )
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GPIO.setup(dot_pin, GPIO.IN, GPIO.PUD_OFF)
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return state == 0
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```
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