diff --git a/all-functions/left-right-pca9554.ino b/all-functions/left-right-pca9554.ino
new file mode 100644
index 0000000..b33140f
--- /dev/null
+++ b/all-functions/left-right-pca9554.ino
@@ -0,0 +1,80 @@
+#include <PCA9554.h>  // Load the PCA9554 Library
+
+PCA9554 ioCon1(0x24);  // Create an object at this address
+
+byte LED_STATES_LEFT_RIGHT[7] = {
+  0b00000001, // power green LED
+  0b00000010, // power red LED
+  0b00000100, // fan green LED
+  0b00001000, // fan red LED
+  0b00010000, // temp green LED
+  0b00100000, // temp red LED
+  0b01000000  // lock button LED
+};
+
+void setupPCADevice() {
+  ioCon1.portMode(ALLOUTPUT);
+}
+
+void resetSideBanks(byte* bank) {
+  *bank = 0;
+}
+
+void updateIOLED(byte* bank) {
+  for (int i = 0; i < 8; ++i) {
+    ioCon1.digitalWrite(i, bitRead(*bank, i) == 1 ? 0 : 1);
+  }
+}
+
+void writeIOLEDPoweredOff(byte* bank) {
+  byte mask = 0b01011110;
+  bitWrite(mask, bank[0], 0);
+  bank = mask;
+}
+
+void setPowerGreen(byte* bank) {
+  *bank |= LED_STATES_LEFT_RIGHT[0];
+}
+
+void setPowerRed(byte* bank) {
+  *bank |= LED_STATES_LEFT_RIGHT[1];
+}
+
+void setPowerOff(byte* bank) {
+  bitWrite(*bank, 0, 0); // green LED off
+  bitWrite(*bank, 1, 0); // red LED off
+}
+
+void setFanGreen(byte* bank) {
+  *bank |= LED_STATES_LEFT_RIGHT[2];
+}
+
+void setFanRed(byte* bank) {
+  *bank |= LED_STATES_LEFT_RIGHT[3];
+}
+
+void setFanOff(byte* bank) {
+  bitWrite(*bank, 2, 0); // green LED off
+  bitWrite(*bank, 3, 0); // red LED off
+}
+
+void setTempGreen(byte* bank) {
+  *bank |= LED_STATES_LEFT_RIGHT[4];
+}
+
+void setTempRed(byte* bank) {
+  *bank |= LED_STATES_LEFT_RIGHT[5];
+}
+
+void setTempOff(byte* bank) {
+  bitWrite(*bank, 4, 0); // green LED off
+  bitWrite(*bank, 5, 0); // red LED off
+}
+
+void setLockButton(byte* bank) {
+  *bank |= LED_STATES_LEFT_RIGHT[6];
+}
+
+void setLockButtonOff(byte* bank) {
+  bitWrite(*bank, 6, 0); // lock button LED off
+}