117 lines
2.3 KiB
Markdown
117 lines
2.3 KiB
Markdown
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<!--
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---
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name: Raspberry Pi Dots
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description: Join the dots to make a circuit
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url: http://www.raspberrypi.org/dots/
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github: https://github.com/raspberrypilearning/dots
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pin:
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bcm0:
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name: 'Color: Blue'
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direction: input
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bcm1:
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name: Dot 7
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direction: input
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bcm2:
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name: Dot 22
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direction: input
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bcm3:
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name: Dot 21
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direction: input
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bcm4:
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name: Dot 2
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direction: input
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bcm5:
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name: Dot 9
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direction: input
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bcm6:
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name: Dot 14
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direction: input
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bcm7:
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name: Dot 6
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direction: input
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bcm8:
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name: Dot 18
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direction: input
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bcm9:
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name: Dot 17
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direction: input
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bcm10:
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name: 'Color: Green'
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direction: input
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bcm11:
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name: Dot 8
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direction: input
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bcm12:
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name: Dot 10
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direction: input
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bcm13:
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name: Cloud
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direction: input
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bcm14:
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name: Dot 1
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direction: input
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bcm15:
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name: Dot 3
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direction: input
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bcm16:
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name: Dot 13
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direction: input
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bcm17:
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name: Dot 4
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direction: input
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bcm18:
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name: Dot 20
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direction: input
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bcm19:
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name: 'Color: Orange'
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direction: input
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bcm20:
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name: Bear
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direction: input
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bcm21:
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name: Dot 12
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direction: input
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bcm22:
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name: Dot 15
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direction: input
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bcm23:
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name: Dot 16
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direction: input
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bcm24:
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name: Dot 19
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direction: input
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bcm25:
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name: Dot 5
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direction: input
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bcm26:
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name: Dot 11
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direction: input
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bcm27:
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name: 'Color: Red'
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direction: input
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-->
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#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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