Water Level and TDS Sensor

This is a design circuit for watel level sensor using TLC555 is a monolithic timing circuit fabricated using the Lin-CMOS* process.  Due to its high impedance inputs (typically 1012 Ohms), it is capable of producing accurate time delays and oscillations while using less expensive, smaller timing capacitors then the NE555. This is the figure of the circuit;

Like the NE555, the TLC555 achieves both mono stable (using one resistor and one capacitor and astable (using two resistors and one capacitor) operation.  In addition, 50% duty cycle astable operation is possible using only a single resistor and one capacitor.  It operates at frequencies up to 2 Mhz and is fully compatible with CMOS, TTL, and MOS logic.  It also provides very low power consumption (typically 1 mW at VDD = 5V) over a wide range of supply voltages ranging from 2 volts to 18 volts.