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Category: Inside Circuits Views: 4483 Rank: 5 The main (and only) job of this circuit is to activate a buzzer or a relay, each time the level of humidity takes a specific value. Main stage is a memory based on a flip-flop consisting of gates and IC1a IC1 b. The output of this step activates an oscillator (IC1c), which in turn leads to a piezoelectric speaker. At the start of operation of the circuit, the flip-flop is driven to logical '0' or through the C1 or through C2. From the moment you excited, the reintroduction of the peace achieved through the switch S1, which however is insufficient if the sensor 82 continues to be wet.  The piezoelectric speaker can easily be replaced by a ilektronomo which in turn activates another external power device, such as a horn, a lamp or anything else is able to provide a distinctive indication. For the relay should note that because the current that drives the coil is pulsed (DC = 50%), the voltage should be less dp 'is the voltage of the detector. If for example supply voltage of the latter is 9 n, then the relay is good to work at 6 V. The current circuit absorbs the rest of the order of 4-5 mA, but increased to 40 mA if the tow relay contacts. The supply voltage can be between 3 and 15 n, but if you use the lower limit relay is limited to 8 V. If during the use of the circuit proved highly sensitive, you can reduce. the value of R2.
Related circuits A Samsung KAA2281 and a few LEDs make up a simple stereo indicator. Levels displayed are -16, -11, -6, -3, and 0 d This de voltmeter, with high input resistance, uses a CA3130 BiMOS op amp and measures voltages from 10 m V to 300 V. Resistors R12 and Rl4 are used individually to calibrate tbe meter for full:scale deflection. Signetics" type NE575 compander IC is intended primarily for use with battery power supplies of 3 to 7 V (max. 8 V). It Buffer-amplifier-for-multiplexers The precision input characteristics of the HA-5147 help simplify system error budgets, while its speed and drive capabilities provide fast charging of the multiplexer"s output capacitance. This speed eliminates an increased multiplexer acquisition time, which can be induced by more limited... The tone burst generator supplies a tone for one-half second after the power supply is activated; its intended use is a communications network alert signal. Cessation of the tone is accomplished at the SCR, which shunts the timing capacitor CI charge current when activated. The SCR is gated on... A bar graph driver IC LM314 drives anXED display. The LEDs may be separate or in a combined (integral) bar graph display. Calibration: With a precision meter be-tvveen pins 4 and 6 adjust Rl for voltage Vq of 1 20V. Apply 4.94V to pin 5, and adjust R4 until LED No. 5 iust lights. The circuit is based on operational amplifier IC1 used in the noninverting amplifier mode. Rl and 2 set the gain at about 500. RV1 (sensitivity) biases the noninverting input to the negative supply. Ql provides the relatively high trigger current required by the triac. When a signal is received... When setting up photographic floodlamps, it is sometimes desirable to operate the lamps at lower power levels until actually ready to take the photograph. The circuit allows the lamps to operate on half cycle power when the switch is open, and full power, when the switch is closed
Articles & Projects
A simple humidity detector can be built using electronic diagram below. Electronic humidity detector scheme is very simple and uses fewer components can be used for activation of electronic devices when the detector senses a certain ...
smart humidity gauge constituted by the humidity sensor and the microprocessor circuit. smart humidity gauge constituted by the humidity sensor and the microprocessor circuit. PIC16F874 has a wide range of supply voltage ...
Temperature and humidity sensors used are SHT75. This sensor is a chip that can measure temperature and humidity as well. The use of these sensors with consideration of its small size and reliability. The output of this ...
resistive humidity sensor wisdom The Projects Forum.
Figure 3 315MHz wireless receiver module schematic Click here to view all news photos temperature and humidity measurement circuit design In this design, the detection of the temperature and humidity selection produced ...
Description: The HH10D relative humidity sensor module is comprised of a capacitive type humidity sensor, a CMOS capacitor to frequency converter and an EEPROM used to hold the calibration factors. Due to the characteristics of capacitor type ... covering the PCB to adjust the I2C address. If tha...
Automatic irrigation motor controling with waterlevel and overheat protection...
A Humidity Sensor Circuit For Arduino
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