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Sensors / Detectors:  Humidity

Sensors / Detectors -- Main Page

 

Last Updated: January 01, 2018 04:02 AM




Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

741 Based Light Sensor -  The circuit as shown act as a light sensor.  Under normal conditions the resistance of the LDR is high, keeping pin 2 low.  When light falls onto the LDR the resistance drops to a couple hundred ohms and triggers pin 2 high which biases the base of Q1 via pin 6 and R4 and in turn activates the relay __ Designed by Tony van Roon  VA3AVR

Arduino hygrometer with grafic interface -  This device is digital wifI hygrometer.  it's a miniature arduino web server.   By mapping ports of your router, you can connect to it from anywhere on the world.  This hygrometer uses arduino skech and trendy vector graphics format SVG. __ Designed by © Pavel Janko

Circuit tests power-outage susceptibility -  03/03/97 EDN Design Ideas:  Brief (1 sec or shorter) power outages are common in developing countries and seem to be increasing in the United States.  They are generally nondestructive, so power-protection equipment should not trip and disconnect the load.  Electric motors do not appreciably slow, and electronic equipment can usually ride through the outages on the energy stored in filter capacitors.  As a point of reference, a 10-msec outage makes an incandescent light bulb flicker.  At 100 msec, you can see the bulb go completely dark.  Figure 1 shows a simple circuit for generating brief outages for equipment-susceptibility testing.    __ Circuit Design by Ron Tipton, TDL Electronics, Las Cruces, NM

Connection tester for checking solder joints & other connections -  A low resistance (0.25 4 ohm) continuity tester for checking soldered joints and connections __ Designed by Andy Collison

Dew Sensor -  Dew (condensed moisture) adversely affects the normal performance of sensitive electronic devices.  A low-cost circuit described here can be used to switch off any gadget automatically in case of excessive humidity.  At the heart of the circuit is an inexpensive (resistor type) dew sensor element.  Although dew sensor elements are widely used in video cassette players and recorders, these may not be easily available in local market.  However, the same can be procured from__ 

Dew-Point Sensor -  Dew-point sensors are widely used in sensitive electronic equipment like cameras and copiers etc, to protect them from moisture failure by fast detection of dew.  You can easily build one yourself...__ Electronics Projects for You

Fridge Temperature & Humidity Indicator -  We can measure temperature and humidity inside the fridge using a normal temperature-humidity indicator but relative humidity (RH) could be inaccurate in that case.  The moment the fridge door is opened, ...__ Electronics Projects for You

Humidity & Temperature Monitoring using Arduino with the IoT -  Using the internet of Things (ioT) in homes and industries it is possible to control any electrical or electronic equipment.  Moreover, you can get the information from any sensor and analyse...__ Electronics Projects for You

Humidity Detector -  This humidity sensor consists of 2 copper conductors that are located at small distance from each other.  The relay switches as soon as the moisture makes a connection that is more or less electrically conductive between the 2 electrodes.  How does the humidity detector works? When the electrical resistance between the 2 sensors __ Designed by Popescu Marian

Humidity Indicator & Controller -  Presented here is a simple humidity indicator and controller.  in industries such as textile, the change in moisture content has a direct impact on the properties of fabric, such as tensile...__ Electronics Projects for You

Humidty Sensor to Data Aquisition System Interface -  The circuit shown in the schematic features zero drift operational amplifiers (LTC1250 and LTC1050) and a precision instrumentation switched capacitor block (LTC1043).  This design will maintain excellent DC accuracy down to microvolt levels.  This method was chosen over the use of a true RMS-to-DC or log converter because of __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Hygrometer & hygrostat -  A simple handheld relative humidity meter, complete with settable control output. __ Designed by Manfred Mornhinweg

Hygrometer WiFi ESP8266-Arduino -  This device is digital wifI hygrometer.  it's a miniature arduino web server.   By mapping ports of your router, you can connect to it from anywhere on the world.  This hygrometer uses arduino skech and trendy vector graphics format SVG. __ Designed by © Pavel Janko

Hygrometer WiFi ESP8266-Lua -  This hygrometer is digital wifI hygrometer.  it's a miniature web server.
By mapping ports of your router, you can connect to it from anywhere on the world.  This hygrometer uses Lua software and
trendy vector graphics format SVG.  Hygrometer is quite fast and stabil. __ Designed by © Pavel Janko

Low-cost relative-humidity transmitter uses single logic IC -  11/08/01 EDN Design Ideas:  The low-cost percentage-relative-humidity radio transmitter in Figure 1 operates in a cold-storage warehouse for vegetable storage at temperatures of 1 to 5°C.  it is generally difficult to collect such data from a low-temperature area with high humidity and low illumination.  The transmitter design is simple  it uses a readily available, capacitor-type percentage-relative-humidity se __ Circuit Design by Shyam Tiwari, Sensors Technology Ltd, Gwalior, India

Lua Hygrometer WiFi ESP8266 -  This hygrometer is digital wifI hygrometer.  it's a miniature web server.
By mapping ports of your router, you can connect to it from anywhere on the world.  This hygrometer uses Lua software and
trendy vector graphics format SVG.  Hygrometer is quite fast and stabil. __ Designed by © Pavel Janko

Measure humidity & temperature on one TTL line -  08/30/01 EDN Design Ideas:  By combining the responses of an Analog Devices (www. Analog.com] AD590 temperature sensor and a Humirel (www.humirel.com] HS1101 humidity sensor, you can generate a single TTL-level signal containing information from both sensors (Figure 1).  This design uses a 74HC123 monostable multivibrator, IC 1, to form a free-running oscillator __ Circuit Design by Shyam Tiwari, Sensors Technology Pvt Ltd, Gwalior, India

Relative Humidity Sensor -  This sensor is a capacitive element that changes value with humidity.  By charging the sensor with a fixed current for a fixed time interval, a voltage is developed that is directly proportional to the sensor capacitance value.  __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Relative Humidity Sensor Digitizer-Charge Pump Based -  Hygrometer Digitizer Has 0.3% Accuracy, Although Sensor Must Float Off-Ground.  Humidity Sensor Determines Charge Delivered to A1 integrator During Each Charge Pump Cycle.  Resultant A1 Output Ramp is Reset by Level Triggered C1 via Q1.  Output Frequency, Taken at C1, Varies with Humidity__ Linear Technology/Analog Devices App Note, ,Mar 16th 2011

Relative Humidity Sensor Digitizer-Hetrodyne Based -  Hetrodyne Based Humidity Transducer Digitizer Has Grounded Sensor, 2% Accuracy.  Capacitively Sensed Hygrometer Beats Humidity Dependent Oscillator (C1) Against Stable Oscillator O1.  Difference Frequency is Demodulated by Q1, Converted to Pulse Form at C2.  Counters Scale Output for 0kHz to 1kHz = 0% to 100% Relative Humidity__ Linear Technology/Analog Devices App Note, Mar 16th 2010

Relative Humidity Sensor Digitizer-Time Domain Bridge Based -  Humidity Transducer Digitizer Has Grounded Sensor, 1% Accuracy; Trim Scheme Allows Low Tolerance Sensors.  Clocked Q1A-Q1B Configurations Produce Ramp Outputs.  Q1A Ramp Slope Varies with Humidity Sensor Value, Q1B Ramp Represents Sensor’s Offset (0% RH does not equal 0pF).  C1, C2 Digitize Ramp Times.  Gate Extracts Time Difference, Presents 0 to 100 Counts Out for 0% to 100% Relative Humidity __ Linear Technology/Analog Devices App Note, Mar 16th 2011

Relative-Humidity Transmitter uses Single Logic IC -  11/08/01  EDN Design Ideas:  The low-cost percentage-relative-humidity radio transmitter in Figure 1 operates in a cold-storage warehouse for vegetable storage at temperatures of 1 to 5°C.  it is generally difficult to collect such data from a low-temperature ar __ Circuit Design by Shyam Tiwari, Sensors Technology Ltd, Gwalior, India

Remote humidity sensor needs no battery -  04/04/02 EDN Design Ideas:  Using ac-line power sources and batteries for remote humidity sensors is undesirable because these sources can be troublesome if you mount them in inaccessible points, such as smokestacks, cold-storage chambers, or darkrooms, where maintenance is difficult and inconvenient.  Figure 1 shows a simple way to remove the power source from the humidity-sensor circuit __ Circuit Design by Shyam Tiwari, Sensors Technology Private Ltd, Gwalior, India

Signal conditioning precisely indicates humidity -  02/02/98 EDN Design Ideas:  The circuit in Figure 1 translates the level of humidity from0 to 100% into a stable, respective dc signal of0 to 100 mV.  The heart of the circuit is IC 1, the iH3602-C relative-humidity sensor (Microswitch/HyCal Sensing Products, Freeport, iL].  This device operates on 5V at 200 mA and provide as a dc output of0.8 to 4.0V __ Circuit Design by William Whitehead, Lafayette, CO

System Monitor with Instrumentation-Grade Accuracy Used to Measure Relative Humidity -  A psychrometer is a type of hygrometer, a device that measures relative humidity.  it uses two thermometers, one dry (dry bulb) and one covered in a fabric saturated with distilled water (wet bulb).  Air is passed over both thermometers, either by a fan or by swinging the instrument, as in a sling psychrometer.  A psychrometric __ Linear Technology/Analog Devices App Note, Jan 30th 2012

Test Power-Outage Susceptibility -  03/03/97 EDN Design Ideas:  Brief (1 sec or shorter) power outages are common in developing countries and seem to be increasing in the United States.  They are generally nondestructive, so power-protection equipment should not trip and disconnect the load.  Electric motors do not appreciably slow, and electronic equipment can usually ride through the outages on the energy stored in filter capacitors.  As a point of reference, a 10-msec outage makes an incandescent light bulb flicker.  At 100 msec, you can see the bulb go completely dark.  Figure 1 shows a simple circuit for generating brief outages for equipment-susceptibility testing.    __ Circuit Design by Ron Tipton, TDL Electronics, Las Cruces, NM

Tiny Dew Sensor -  Dew (condensed moisture) adversely affects the normal performance of sensitive electronic devices.  A low-cost circuit described here can be used to switch off any gadget automatically in case of excessive humidity. At...__ Electronics Projects for You

Transmitter senses triple relative-humidity figures -  09/26/02 EDN Design Ideas:  The circuit in Figure 1 is a triple, relative-humidity sensor and radio transmitter.  Sensors 1 and 2 form two gated oscillators with natural frequencies of 10 and 5 kHz, respectively, at relative humidity of 50%.  The gated oscillators use variable resistances R2 and R3, respectively.  Together, these two oscillators generate FSK-modulated outputs at output of IC 1B, Pin 6 __ Circuit Design by Shyam Tiwari, Sensors Technology Ltd, Gwalior, India

Wet Bulb Psychrometer -  The LTC2990 is used to monitor system temperatures, voltages and currents.__ Linear Technology/Analog Devices App Note, Oct 26th 2010

Wireless Temperature & Humidity Sensor with USB -  this project is based on obdev's Remote Sensor example and their firmware-only USB implementation; the main change is the replacement of the analog sensors with a Sensirion SHT11 digital temperature and humidity sensor__ 

Wireless Weather Station. Part 1 -  in the Midwest, the main topics of conversation may include the local football team or how the crops are doing.  inevitably though, the conversation always leads to the weather.  Most of us take the weather for granted __ Designed by Jerry Wasinger

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Please eMail
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  Humidity  Sensors / Detectors / Monitors


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