Advertisement
Quick Links
Automatic turn off water pump on desired level + water level indicator/sensor
PART NO. 2215988
This kit is used to learn how we can use simple cmos 4049 inverter to create latch circuit for turning ON and OFF water pump, sensor
and indicator. Also this device uses two different voltage levels for his work. Firstly we use linear regulator to step down 12V DC to 9V
DC, that voltage level is used as supply for IC 4049 and LEDs. Second voltage level is 5V and it is obtained with second linear regulator
which will step down 9V from first regulator to 5V, those 5V are used as supply for relay module. This two levels are needed because
cmos 4049 for his work needs voltage in range from 5V to 16V.
This project is designed around single CMOS Logic Inverting 4049 chip, water pump is turned ON and OFF with relay module while
water level in tank is shown with 4 LEDs.
Firstly as sensors for this circuit simple copper wires which are placed on different levels in tank could be used, ground wire is placed
at the bottom of tank.
Inputs of logic NOT gates are connected in series with resistors of big value and with positive terminal of power supply, sensor wire is
connected between resistor and NOT gate input.
Output of inverting gate is connected with LED and appropriate resistor. So if we put positive voltage on input of NOT gate we will get
negative output so LED diode will not glow.
When water in tank starts to rise it will get in contact with sensor and will ground input of NOT gate and that means that output of NOT
gate will change from negative to positive and LED will glow and indicate water level. LED diode and resistor are connected with ground.
Those positive outputs are also used to feed transistor base which then brake latch circuit and turn OFF water pump.
Latch circuit is created with two NOT gates in series and resistor in parallel with them.
Latch is turned ON by getting positive impulse on input of first NOT gate and that positive impulse at the output of second NOT gate will
activate transistor which will then activate relay module and water pump.
Latch will be broken by grounding inputs of NOT gates with transistor which will be turned on like LED diodes.
Advertisement
Summary of Contents for Jameco 2215988
- Page 1 Automatic turn off water pump on desired level + water level indicator/sensor PART NO. 2215988 This kit is used to learn how we can use simple cmos 4049 inverter to create latch circuit for turning ON and OFF water pump, sensor and indicator.
-
Page 2: Bill Of Materials
5V logic level at board output terminals. Relay module (Jameco Part no. 2260842) is connected to PCB with jumper wires. Separate relay module is used so that device is more safer for final user. - Page 3 Incorrect wiring can cause damage to appliances or more importantly, yourself! It is advised that user check delivered parts and see if DIY kit contains all necessary parts. Due to inventory packaging methods, you may receive extra components for some products. Kit assembling should be done in safe environment without strong humidity and on fireproof bench.
- Page 4 Step 3 - Resistors Resistor is a passive component used to control current in a circuit. Its resistance is given by the ratio of voltage applied across its terminals to the current passing through it. Thus a particular value of resistor, for fixed voltage, limits the current through it. They are omnipresent in electronic circuits.
- Page 5 Step 5 - High speed switching diode 1N4148 is a high speed switching diode. The switching diodes are designed such that their reverse recovery time is very small compared to ordinary diodes. The typical switching time is 4 nsec. It comes in hermetically sealed leaded glass package. Diode 1N4148 in this circuit is used to short circuit current which is inducted when relay coil is de-energized from power supply.
- Page 6 - No current flowing from B to E = Current allowed to flow from C to E - Current flowing from B to E = No flow from C to E B-base E-emitter C-collector To place transistor on the board firstly find it on the silk screen and place it through holes on the board, line up the transistor so the flat side matches the outline on the board.
- Page 7 Step 8 - Switches A tact switch is type of switch that is only on when the button is pressed. As soon as you release the button, the circuit is broken. These switches in this circuit are used to feed positive voltage to latch circuit or to ground that positive voltage, they are turning on or off transistor which is then turning on or off relay module.
- Page 8 Step 10 - Socket and 4049 hex inverter The digital Logic NOT Gate is the most basic of all the logical gates and is sometimes referred to as an Inverting Buffer or simply a Digital Inverter. It is a single input device which has an output level that is normally at logic level “1” and goes “LOW” to a logic level “0” when its single input is at logic level “1”, in other words it “inverts”...
- Page 9 9V regulator have mark 7809 and 5V 7805. U1 is 9V voltage regulator and U2 is 5V voltage regulator place them on their place so that side with bigger hole is on the side with line on top silk symbol. Step 12 - Pin headers A pin header (or simply header) is a form of electrical connector, often associated with ribbon cable connectors.
- Page 10 Peak voltage: 250V (30VDC) at 10A Terminal Block J1: Pin1 is ON, Pin 2 is COM Relay: HLS8L-DC3V-S-C Dimensions: 1.65" x 0.94" x 0.77" Connect relay module to board pins, pin with gnd mark for relay module should be connected with Pin2 on relay module and other pin should be connected with Pin1 on relay module.
- Page 11 Step 15 - Placing sensor wires in tank Image shows on which level should sensor wires be placed. Also image shows which part of dip switch should be turned on to turn off water pump on desired level.
Need help?
Do you have a question about the 2215988 and is the answer not in the manual?
Questions and answers