update readme.md - added 8PIN connector

added wiring recommendations for 8pin connector

readme.md

@@ -110,6 +110,42 @@ From the Thermoplay connector label (Image 2):
 
 ---
 
+# Thermocouple + Heater Connection Diagram
+
+Connection scheme for a typical dual-zone heating system with two heaters and two thermocouples (usually type K).
+
+## Pinout / Terminal Layout - 8PIN connector 7+PE
+
+| PIN   | OZNAKA / Signal       | Description                  | Typical Wire Color (Type K) |
+|-------|-----------------------|------------------------------|-----------------------------|
+| 1     | Grelec 1              | Heater 1 – Live / Phase      | –                           |
+| 2     | Termočlen 1+          | Thermocouple 1 – Positive    | Yellow / Green              |
+| 3     | Grelec 2              | Heater 2 – Live / Phase      | –                           |
+| 4     | Termočlen 2 +         | Thermocouple 2 – Positive    | Yellow / Green              |
+| 5     | Grelec 1              | Heater 1 – Neutral / Return  | –                           |
+| 6     | Termočlen 1-          | Thermocouple 1 – Negative    | White / Red                 |
+| 7     | Grelec 2              | Heater 2 – Neutral / Return  | –                           |
+| 8/PE  | Termočlen 2-          | Thermocouple 2 – Negative    | White / Red                 |
+
+**Notes:**
+
+- Pins 1 & 5 → Heater 1 (usually 230 V AC or 24 V, depending on system)
+- Pins 3 & 7 → Heater 2
+- Pins 2 & 6 → Thermocouple 1 (most likely type K)
+- Pins 4 & 8 → Thermocouple 2 (most likely type K)
+- Pin 8 is often marked as **PE** on the connector, but in this case it is used as **TC2–** (negative leg of the second thermocouple)
+
+## Wiring Recommendations
+
+- Use **compensating cable** (type K compensation) or true thermocouple extension wire for pins 2,4,6,8
+- Never use ordinary copper wire for thermocouple connections → causes large measurement error
+- Heater wires (1,3,5,7) – use appropriate cross-section according to current (usually 0.75–2.5 mm²)
+- Recommended tightening torque: usually 0.5–0.6 Nm (check connector specification)
+
+## Visual connection scheme (text version)
+
+
+
 ## Notes
 
 - Always verify wiring with a multimeter before powering up.