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Technical-reference.md

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Pinout

ADC, via ADS1015, i2c addr 0x48 ( Explorer HAT Pro and pHAT only )

The Explorer HAT ADC uses i2c, so it doesn't have input pins associated with it.

Cap Touch, via CAP1208, i2c addr 0x28

Read from register 3 to retrieve button states. These will latch until register 0 is cleared.

Register 0 will show an 0x01, interrupt, flag if a touch has been detected since the last clear.

Button Register Value
1 0x10
2 0x20
3 0x40
4 0x80
5 0x1
6 0x2
7 0x4
8 0x8

LEDs ( HAT only )

Both models of Explorer HAT have 4 LEDs, these are turned on with a logic HIGH and off with a LOW.

LED GPIO pin
LED 1 GPIO 4
LED 2 GPIO 17
LED 3 GPIO 27
LED 4 GPIO 5

Outputs, via ULN2003A

Explorer HAT/pHAT has a ULN2003A output driver. When you turn one of these outputs on ( logic HIGH ) it will sink current to ground. Be mindful of this when connecting to the output driver- you'll need to connect your device to a voltage supply, and then to the output pin.

Output GPIO pin
Output 1 GPIO 6
Output 2 GPIO 12
Output 3 GPIO 13
Output 4 GPIO 16

Inputs, via SN74LVC125APWR (5V tolerant input buffer)

Explorer HAT/pHAT has four protected inputs. These are just like normal input pins on your Pi, except they can tolerate 5V and cannot be pulled up/down from the Pi.

Input GPIO pin
Input 1 GPIO 23
Input 2 GPIO 22
Input 3 GPIO 24
Input 4 GPIO 25

Since the Pi's GPIO pin is after the buffer, input signals will not be pulled up or down by enabling the Pi's onboard pull resistors. For applications where you need a pull resistor you must substitute an external resistor between an Input and either Ground or +5V.

Motor, via DRV8833PWP ( Explorer HAT Pro and pHAT only )

Explorer HAT Pro has a motor driver onboard. It can drive motors in both directions depending on which pin you switch high and which you switch low. It uses two pairs of pins- 21,26 and 19,20 for each motor channel.

Function Motor GPIO pin 
+    |   1   | GPIO 19
-    |   1   | GPIO 20
+    |   2   | GPIO 21
-    |   2   | GPIO 26

3.3v breakout ( Explorer HAT Pro only )

Explorer HAT Pro breaks out a number of your Raspberry Pi IO pins to give you convenient access to I2C, PWM, SPI and Serial/UART. None of these pins are 5V tolerant, so be careful what you connect!

Function GPIO pin
SDA GPIO 2
SCL GPIO 3
--------- ----------
PWM GPIO 18
--------- ----------
MOSI GPIO 10
MISO GPIO 9
SCK GPIO 11
CS GPIO 8
--------- ----------
TX GPIO 14
RX GPIO 15