Seven Segment Display Not Showing Numbers in Water Level Detector Circuit—Wiring Issue?

The discussion addresses an issue with a seven-segment display in a water level detector circuit where no numbers appear when pins 3 and 8 are connected to ground, but the display lights up when connected to VCC without showing digits. The likely cause is the use of a common anode display instead of a common cathode, affecting proper operation. Testing by grounding individual segment pins (L-1 to L-9) can verify correct display functionality. The inquiry about pin 5 on the seven-segment display clarifies that it corresponds to the decimal point (DP) and can be left unconnected or tied high/low depending on whether illumination of the decimal point is desired.
Summary generated by the language model.