Create picade-hat.md

draft/overlay/picade-hat.md

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+<!--
+---
+name: Picade HAT
+class: board
+type: input
+formfactor: HAT
+manufacturer: Pimoroni
+description: Arcade control inputs plus mono I2S digital audio
+buy: https://shop.pimoroni.com/
+image: 'picade-hat.png'
+pincount: 40
+eeprom: yes
+power:
+  '1':
+  '2':
+  '4':
+  '17':
+ground:
+  '6':
+  '9':
+  '14':
+  '20':
+  '25':
+  '30':
+  '34':
+  '39':
+pin:
+  '12':
+    name: I2S
+  '35':
+    name: I2S
+  '40':
+    name: I2S
+  '7':
+    name: Shutdown
+  '11':
+    name: Power
+  '13':
+    name: Enter
+  '15':
+    name: Escape
+  '16':
+    name: Coin
+  '18':
+    name: Start
+  '29':
+    name: 'Button 1'
+  '23':
+    name: 'Button 2'
+  '24':
+    name: 'Button 3'
+  '22':
+    name: 'Button 4'
+  '21':
+    name: 'Button 5'
+  '19':
+    name: 'Button 6'
+  '32':
+    name: Up
+  '31':
+    name: Down
+  '38':
+    name: Left
+  '36':
+    name: Right
+install:
+  'devices':
+  - 'i2s'
+-->
+#Picade HAT
+
+Picade HAT provides screw terminals for 10 arcade buttons and a joystick. It also includes a digital to analog audio converter and amplifier which outputs to a single speaker terminal.
+
+All button inputs should be configured with their corresponding internal pull-ups. Buttons should be wired between an input and ground.
+
+* 14 button terminals
+* Stereo audio combined for a single speaker
+* Support for an external power button and safe power shutdown