How this Water Level Indicator works:
When the water tank is empty condition, all the inputs of IC1 remain high. As a result, its output also remains high, making all the inputs of IC2 low. Display LTS543 at this stage shows “0”, which means the water tank is empty condition. Similarly, when the water level reaches L-1 position, the display shows “1”, and when the water level reaches L-8 position, the display shows “8”. Finally, when the tank is full, all the inputs of IC1 become low and its output goes low to make all the inputs of IC2 high. Display LTS543 now shows “9”, which means the water tank is full condition.
Will the circuit work even if you replace the 12k resistors with 10k resistors? Also how could you add more 7 segment displays since I have the parts to do such a thing.
Thank you for your cool and interesting project.