Format debug output by field

README.md

@@ -98,6 +98,29 @@ If IG1 is still ON:
 autoCalOffTimer=waiting_for_ig_off
 ```
 
+Debug mode prints a readable block every second, one item per line. Boolean values are printed as `true` or `false`:
+
+```text
+[DEBUG]
+uptime=0h 0m 5s 123ms
+raw=1023
+ig=true
+p=true
+rawDrive=false
+confirmedDrive=false
+currentMs=0
+targetMs=0
+savedMs=6000
+requestedRelay=0
+actualRelay=0
+manual=false
+stabilizing=false
+useCount=0/10
+autoPending=false
+forceCal=false
+autoCalState=0
+```
+
 ## Automatic Calibration
 
 - Each `IG1 HIGH -> LOW` transition increments the EEPROM use counter.