diff --git a/common/pimoroni_common.hpp b/common/pimoroni_common.hpp
index 9f372c11..cfc1a58f 100644
--- a/common/pimoroni_common.hpp
+++ b/common/pimoroni_common.hpp
@@ -31,7 +31,8 @@ namespace pimoroni {
 
     enum BG_SPI_SLOT {
       BG_SPI_FRONT,
-      BG_SPI_BACK
+      BG_SPI_BACK,
+      PICO_EXPLORER_ONBOARD
     };
 
     enum BOARD {
diff --git a/drivers/st7735/st7735.cpp b/drivers/st7735/st7735.cpp
index 5f2808fc..52cd714d 100644
--- a/drivers/st7735/st7735.cpp
+++ b/drivers/st7735/st7735.cpp
@@ -79,13 +79,13 @@ namespace pimoroni {
     gpio_set_function(sck,  GPIO_FUNC_SPI);
     gpio_set_function(mosi, GPIO_FUNC_SPI);
 
-    if(miso != -1) {
+    if(miso != PIN_UNUSED) {
       gpio_set_function(miso, GPIO_FUNC_SPI);
     }
 
     // if supported by the display then the vsync pin is
     // toggled high during vertical blanking period
-    if(vsync != -1) {
+    if(vsync != PIN_UNUSED) {
       gpio_set_function(vsync, GPIO_FUNC_SIO);
       gpio_set_dir(vsync, GPIO_IN);
       gpio_set_pulls(vsync, false, true);
@@ -93,7 +93,7 @@ namespace pimoroni {
 
     // if a backlight pin is provided then set it up for
     // pwm control
-    if(bl != -1) {
+    if(bl != PIN_UNUSED) {
       pwm_config cfg = pwm_get_default_config();
       pwm_set_wrap(pwm_gpio_to_slice_num(bl), 65535);
       pwm_init(pwm_gpio_to_slice_num(bl), &cfg, true);
diff --git a/drivers/st7735/st7735.hpp b/drivers/st7735/st7735.hpp
index 6b912eed..e4f8c327 100644
--- a/drivers/st7735/st7735.hpp
+++ b/drivers/st7735/st7735.hpp
@@ -40,13 +40,13 @@ namespace pimoroni {
     uint32_t dma_channel;
 
     // interface pins with our standard defaults where appropriate
-    int8_t cs     = DEFAULT_CS_PIN;
-    int8_t dc     = DEFAULT_DC_PIN;
-    int8_t sck    = DEFAULT_SCK_PIN;
-    int8_t mosi   = DEFAULT_MOSI_PIN;
-    int8_t miso   = -1; // we generally don't use this pin
-    int8_t bl     = DEFAULT_BL_PIN;
-    int8_t vsync  = -1; // only available on some products
+    uint cs     = DEFAULT_CS_PIN;
+    uint dc     = DEFAULT_DC_PIN;
+    uint sck    = DEFAULT_SCK_PIN;
+    uint mosi   = DEFAULT_MOSI_PIN;
+    uint miso   = PIN_UNUSED; // we generally don't use this pin
+    uint bl     = DEFAULT_BL_PIN;
+    uint vsync  = PIN_UNUSED; // only available on some products
 
     uint32_t spi_baud = 30 * 1024 * 1024;
 
@@ -61,13 +61,17 @@ namespace pimoroni {
     ST7735(uint16_t width, uint16_t height, uint16_t *frame_buffer, BG_SPI_SLOT slot) :
       width(width), height(height), frame_buffer(frame_buffer) {
       switch(slot) {
+        case PICO_EXPLORER_ONBOARD: // Don't read too much into this, the case is just here to avoid a compile error
+          cs = SPI_BG_FRONT_CS;
+          bl = PIN_UNUSED;
+          break;
         case BG_SPI_FRONT:
-          cs = 17;
-          bl = 20;
+          cs = SPI_BG_FRONT_CS;
+          bl = SPI_BG_FRONT_PWM;
           break;
         case BG_SPI_BACK:
-          cs = 22;
-          bl = 21;
+          cs = SPI_BG_BACK_CS;
+          bl = SPI_BG_BACK_PWM;
           break;
       }
     }
diff --git a/drivers/st7789/st7789.hpp b/drivers/st7789/st7789.hpp
index 12019bd5..87b54421 100644
--- a/drivers/st7789/st7789.hpp
+++ b/drivers/st7789/st7789.hpp
@@ -38,6 +38,10 @@ namespace pimoroni {
     ST7789(uint16_t width, uint16_t height, uint16_t *frame_buffer, BG_SPI_SLOT slot) :
       width(width), height(height), frame_buffer(frame_buffer) {
       switch(slot) {
+        case PICO_EXPLORER_ONBOARD:
+          cs = SPI_BG_FRONT_CS;
+          bl = PIN_UNUSED;
+          break;
         case BG_SPI_FRONT:
           cs = SPI_BG_FRONT_CS;
           bl = SPI_BG_FRONT_PWM;
diff --git a/examples/pico_pot_explorer/demo.cpp b/examples/pico_pot_explorer/demo.cpp
index d5eed107..4455c18c 100644
--- a/examples/pico_pot_explorer/demo.cpp
+++ b/examples/pico_pot_explorer/demo.cpp
@@ -4,6 +4,7 @@
 #include <sstream>
 #include <iomanip>
 
+#include "common/pimoroni_i2c.hpp"
 #include "pico_explorer.hpp"
 #include "breakout_potentiometer.hpp"
 
@@ -12,7 +13,8 @@ using namespace pimoroni;
 uint16_t buffer[PicoExplorer::WIDTH * PicoExplorer::HEIGHT];
 PicoExplorer pico_explorer(buffer);
 
-BreakoutPotentiometer pot;
+I2C i2c(PICO_EXPLORER);
+BreakoutPotentiometer pot(&i2c);
 bool toggle = false;
 
 // HSV Conversion expects float inputs in the range of 0.00-1.00 for each channel
@@ -44,6 +46,8 @@ int main() {
   pico_explorer.init();
   pico_explorer.update();
 
+  printf("Starting...\n");
+
   if(pot.init()) {
     printf("Potentiometer found...\n");
 
@@ -102,7 +106,7 @@ int main() {
     }
   }
   else {
-    printf("Encoder Potentiometer found :'(\n");
+    printf("No Potentiometer found :'(\n");
     gpio_put(PICO_DEFAULT_LED_PIN, true);
   }
 
diff --git a/libraries/pico_display/pico_display.cpp b/libraries/pico_display/pico_display.cpp
index 0e2606e5..6af25dbf 100644
--- a/libraries/pico_display/pico_display.cpp
+++ b/libraries/pico_display/pico_display.cpp
@@ -13,12 +13,12 @@ const uint8_t LED_B = 8;
 namespace pimoroni {
 
   PicoDisplay::PicoDisplay(uint16_t *buf)
-    : PicoGraphics(WIDTH, HEIGHT, buf), screen(WIDTH, HEIGHT, buf)  {
+    : PicoGraphics(WIDTH, HEIGHT, buf), screen(WIDTH, HEIGHT, buf, BG_SPI_FRONT)  {
       __fb = buf;
   }
 
   PicoDisplay::PicoDisplay(uint16_t *buf, int width, int height)
-    : PicoGraphics(width, height, buf), screen(width, height, buf)  {
+    : PicoGraphics(width, height, buf), screen(width, height, buf, BG_SPI_FRONT)  {
       __fb = buf;
   }
 
diff --git a/libraries/pico_explorer/pico_explorer.cpp b/libraries/pico_explorer/pico_explorer.cpp
index 5c416a25..f6fa5a5e 100644
--- a/libraries/pico_explorer/pico_explorer.cpp
+++ b/libraries/pico_explorer/pico_explorer.cpp
@@ -15,7 +15,7 @@ const uint8_t MOTOR2P = 11;
 namespace pimoroni {
 
   PicoExplorer::PicoExplorer(uint16_t *buf)
-    : PicoGraphics(WIDTH, HEIGHT, buf), screen(WIDTH, HEIGHT, buf)  {
+    : PicoGraphics(WIDTH, HEIGHT, buf), screen(WIDTH, HEIGHT, buf, PICO_EXPLORER_ONBOARD)  {
     __fb = buf;
   }