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update readme.md - added 8PIN connector

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added wiring recommendations for 8pin connector
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@ -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.