Update README.md

README.md

@@ -41,8 +41,19 @@ Each meter has configurable **Min** / **Max** values that define its physical ra
 | PWM freq | 5 kHz |
 | PWM resolution | 10-bit |
 
-Connect the meter coil (via a current-limiting resistor sized for full-scale) between a GPIO pin and GND. Find the correct resistor value by raising **Max Duty** slowly until the needle reaches full scale. 660
+Connect the meter coil (via a current-limiting resistor sized for full-scale) between a GPIO pin and GND. Find the correct resistor value by raising **Max Duty** slowly until the needle reaches full scale. 
 
+Here's a list of suggested current-limiting resistors:
+
+| Meter full-scale (I_fs) | Typical R_coil | V across coil @ FS | Series R (calc) | Nearest E12 (≤calc) | Pin current @ 100% duty |
+|---|---|---|---|---|---|
+| 50 µA | 1–5 kΩ | ~0.2 V | 62 kΩ | 56 kΩ | 54 µA |
+| 100 µA | 0.5–2 kΩ | ~0.15 V | 31 kΩ | 27 kΩ | 114 µA |
+| 200 µA | 0.5–1 kΩ | ~0.15 V | 15.7 kΩ | 15 kΩ | 203 µA |
+| 500 µA | 100–500 Ω | ~0.15 V | 6.3 kΩ | 5.6 kΩ | 551 µA |
+| 1 mA | 50–200 Ω | ~0.15 V | 3.15 kΩ | 2.7 kΩ | 1.14 mA |
+| 5 mA | 20–80 Ω | ~0.2 V | 620 Ω | 560 Ω | 5.34 mA |
+| 10 mA | 5–40 Ω | ~0.2 V | 310 Ω | 270 Ω | 11.4 mA |
 ---
 
 ## Building and flashing
@@ -74,7 +85,7 @@ On first boot (or when stored Wi-Fi credentials are missing), the device starts
 
 After connecting, the device is reachable at:
 
-- `http://m1730.local` (mDNS, works on most local networks)
+- `http://<nhostname>.local` (default `http://m1730.local`) (mDNS, works on most local networks)
 - `http://<IP address>` (shown in the serial monitor on boot)
 
 ### Factory reset (forgot password)