define SBUS in config

README.md

@@ -93,11 +93,21 @@ GND          -> Common Ground
 - Add 100-500µF capacitor near strips
 - Add 330Ω resistor on data line
 
-### PWM Signal
+
+### PWM Signal Mode 
 - Standard RC PWM: 1000-2000µs pulse width
 - 1500µs threshold for mode switching
 - Rising edge >1500µs after <1500µs triggers next mode
 
+
+### SBUS Mode (FrSky X4R-SB)
+```
+X4R-SB SBUS/CH4 → ESP32 UART1 RX Pin (configured GPIO)
+```
+
+**Note**: The FrSky X4R-SB outputs inverted SBUS. The module automatically handles this inversion.
+
+
 ## Development
 
 ### Adding New Animations
@@ -118,6 +128,23 @@ idf.py monitor
 # Exit monitor: Ctrl+]
 ```
 
+#### Debug Output (SBUS Mode Only)
+
+```c
+// Print all 16 channels to console
+rcsignal_debug_print_channels();
+```
+
+Example output:
+```
+I (12345) RCSIGNAL: SBUS Channels:
+I (12345) RCSIGNAL:   CH1: 992  CH2: 992  CH3: 172  CH4: 1811
+I (12345) RCSIGNAL:   CH5: 992  CH6: 992  CH7: 992  CH8: 992
+I (12345) RCSIGNAL:   CH9: 992 CH10: 992 CH11: 992 CH12: 992
+I (12345) RCSIGNAL:  CH13: 992 CH14: 992 CH15: 992 CH16: 992
+I (12345) RCSIGNAL: Trigger channel (CH4): 1811
+```
+
 ## License
 
 See [LICENSE](LICENSE)