- #1
cyeokpeng
- 69
- 0
Hi,
Theoertically, this circuit should work, because when water reaches the probe sensor (Level n), it will have a finite conductance and the input to the 7407 hex buffer will register as logic 1. This will lead to its output as logic 1 also, and since 7407 uses positive logic convenetion, this will mean H voltage, and will light up the LED. But I test it out on breadboard, and it doesn't work. I have checked and checked the connections again, but they are all correct.
Is there anything wrong with the design?
Theoertically, this circuit should work, because when water reaches the probe sensor (Level n), it will have a finite conductance and the input to the 7407 hex buffer will register as logic 1. This will lead to its output as logic 1 also, and since 7407 uses positive logic convenetion, this will mean H voltage, and will light up the LED. But I test it out on breadboard, and it doesn't work. I have checked and checked the connections again, but they are all correct.
Is there anything wrong with the design?
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