// Howdy 👋.
//
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//
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//
// To infinity and beyond 🚀
+12V
|
+----[LED RED]----[1k]-----> BC547 (EMPTY transistor) Collector
| |
+----[Buzzer EMPTY]--------------+
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+----[LED GREEN]--[1k]-----> BC547 (FULL transistor) Collector
|
+----[Buzzer FULL]-------------+
SENSOR SECTION:
COM probe → GND
EMPTY probe →---[10k to GND]---→ BC547 base (via 1N4148 diode)
FULL probe →---[10k to GND]---→ BC547 base (via 1N4148 diode)
BC547 emitters → GND