IC 74HC147 PDF

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Most water level indicator for water tanks are based upon the number of LEDs that glow to indicate the corresponding level of water in the container. Here we present a digital version of the water-level indicator. The circuit works off 5V regulated power supply. Due to high input impedance, IC1 senses water in the container from its nine input terminals.

The ground terminal of the sensor must be kept at the bottom of the container tank. The input L-9 has the highest priority. This logic inverter is used to convert the active-low output of IC1 into active-high for IC2. Resistors R18 through R24 limit the current through the display. When the tank is empty, all the inputs of IC1 remain high. As a result, its output also remains high, making all the inputs of IC2 low. Assemble the circuit on a general-purpose PCB and enclose in a box. Mount 7-segment LTS on the front panel of the box.

For sensors L-1 though L-9 and ground, use corrosion-free conductive-metal stainless-steel strips. More interesting projects available here. Please why did you choose those particular resistor values? The K, 12K, 33K and ohms resistors. Resistors are mostly using for resist current flow, Here in 74HC is a Cmos logic ic and its input pins has current limitations of micro ampere. BC need only. How much difficult is it to incorporate a level control and alarm?

For example. L1, L9 low and high level alarm. L2, L8 Start and Stop of water pump control. If yes what are the modifications in circuit? Change the 7 Seg decoder to IC or equivalent and use a common anode display. The circuit should work fine. Sign in Join. Sign in. Log into your account. Sign up. Password recovery.

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