spelling correction

README.md

@@ -75,7 +75,7 @@ On the back of the board (the side without components) are pads for 3 optional c
 
 | Pad | Function |
 | --- | --- |
-| C-TM |  Reguate the repeat trigger time. The default (unpopulated) time is 2s. A SMD capacitor to extend the repeat trigger time. Pin 3 of the IC emits a frequency (f), and the tigger time in seconds is given by (1/f) * 32678 |
+| C-TM |  Regulate the repeat trigger time. The default (unpopulated) time is 2s. A SMD capacitor to extend the repeat trigger time. Pin 3 of the IC emits a frequency (f), and the tigger time in seconds is given by (1/f) * 32678 |
 | R-GN | The default detection range is 7m, adding a 1M resistor reduces it to 5m |
 | R-CDS| the VCC is in parrel connection with CDS(RCWL-9196 pin 9) through R-CDS. Connect the LDR at the R-CDS to turn off the detecting function at night. (?? TODO: make sense of this) |