Update README.md with connector pinouts and resistor values

README.md

@@ -13,4 +13,47 @@ Communications with the Arduino occur over a serial-USB connection with the host
 | 3 | State 3: NS yellow, EW red |
 | 4 | State 4: NS red, EW red (safety delay) |
 | 5 | State 5: NS red, EW green |
-| 6 | State 6: NS red, EW yellow |
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+| 6 | State 6: NS red, EW yellow |
+
+## Hardware
+
+### 2-Way Traffic Light
+
+**Resistor Values:**
+
+| LED Color | Resistor Value | Color Code |
+|:------:|:------:|:------:|
+| Red | 330Ω | Orange-Orange-Brown |
+| Yellow | 15Ω | Brown-Green-Black |
+| Green | 2kΩ | Red-Black-Red |
+
+**Connector Pinout:**
+
+| Pin | Function |
+|:------:| ------ |
+| 1 | GND |
+| 2 | Red |
+| 3 | Yellow |
+| 4 | Green |
+
+### 4-Way Traffic Light
+
+**Resistor Values:**
+
+| LED Color | Resistor Value | Color Code |
+|:------:|:------:|:------:|
+| Red | 160Ω | Brown-Blue-Brown  |
+| Yellow | 7.5Ω | Violet-Green-Gold | 
+| Green | 1kΩ | Brown-Black-Red |
+
+**Connector Pinout:**
+
+| Function | Pin | Pin | Function |
+| ------:|:------:|:------:| ------ |
+| GND | 1 | 2 | GND |
+| Red - East | 3 | 4 | Red - West |
+| Yellow - East | 5 | 6 | Yellow - West |
+| Green - East | 7 | 8 | Green - West |
+| Red - South | 9 | 10 | Red - North |
+| Yellow - South | 11 | 12 | Yellow - North |
+| Green - South | 13 | 14 | Green - North |
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