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Questions tagged [humidity]

The tag has no usage guidance.

0
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1answer
67 views

Help with Arduino loops please! [closed]

So I have an Arduino Uno and I've made a device to humidify my the enclosure for my Tortoise. The device consists of a temperature and humidity sensor, an LCD screen to display temperature and ...
0
votes
1answer
23 views

How to find the actual measurement range of a temperature sensor, HTS221?

I am considering to buy the HTS221 Digital Temperature and Humidity Sensor by STMicroelectronics. The datasheet says the operating temperature of the sensor is from -40°C to 120°C. But on page 33 of ...
29
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8answers
4k views

Moisture Trapped in IP66 Enclosure

I got a field report of a product which is sealed in an IP66 aluminum die cast body. it was observed that water/moisture had condensed inside the enclosure over and over and creating some white marks ...
0
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4answers
83 views

Voltage Dividers for a beginner (with respect to soil moisture sensors)

I've just started with electronics and want to make an analogue soil moisture sensor (with Arduino). When I looked online for an explanation of the working, every site said that it works as a voltage ...
0
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0answers
72 views

Waterproof PCB pump driving stage

We are having issues with a small 12V DC pump which is used in a number of test systems in the field. The pump is powered by a standard DC power supply and integrates a small PCB driving stage, with ...
0
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0answers
603 views

Smallest circuit for Ultrasonic Mist Maker or humidifier

I am working on Ultrasonic Mist Maker or humidifier circuit, but does not found any good circuit. As search on google that we have to make about frequency 1.6MHz to convert water into mist. using ...
1
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1answer
44 views

Soil moisture sensor interface protocol

I want to get some measurements from a soil using a simple soil moisture sensor like this one: It has an analog output proportional to soil moisture. The goal is to send the measurements through Sub-...
0
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4answers
283 views

Calibrating a capacitive moisture sensor

I am doing a project which require to build a moisture sensor to measure wood chip moisture content. I built the the cylinder and put all the capacitor plate around it and I was able to measure the ...
1
vote
1answer
133 views

What components have a MSL of 5 and 6?

Moisture Sensitivity Level (MSL) relates to the packaging and handling precautions for some semiconductors. Components with an MSL of 1 have an unlimited floor life, whereas components with an MSL of ...
0
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1answer
26 views

Augmenting a capacitance base humidity sensing circuit

Given an electronic device that measures humidity using a capacitance based humidity sensor, how would one alter the circuit to make the humidity reading lower? From what I can see without taking the ...
1
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1answer
826 views

YL 38 moisture sensor [closed]

im well tired of the leds on this sensor and im wondering if i can remove it. I know very little about schematics but i know how to go wild with a solder iron! I found this schematic online and my ...
1
vote
1answer
86 views

Part Identification - Humidity Sensor Oregon Scientific BAR208HGA

The humidity sensor in my Oregon Scientific Weather Station (BAR208HGA) is stuck at 27% in vastly varying conditions. Having declared it dead, I'm looking for a replacement. (Edit: indoor unit; sat ...
0
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0answers
36 views

which method is suitable for fabricating a capacitive moisture sensor on the silicon based solar cell?

I am trying to fabricate the Capacitive based moisture sensor to the solar cell to identify the moisture levels in the photovoltaic modules. Is the physical vapor deposition better or the Screen ...
5
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3answers
2k views

Storing Electronic Components Outside

I just recently organized all the assortments of components I own and it all currently resides in my garage. I live in Michigan, so our weather goes back and forth on both extremes of temperature and ...
0
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2answers
583 views

555 circuit for moisture sensor

I have built a grain moisture sensor using a 555 timer and an arduino, as shown in the figure: . The sensor is composed of a two parallel aluminum plates (as in a capacitor): The output of this ...
3
votes
1answer
106 views

Are oil-filled transformers ever run at a vacuum?

Larger oil-filled transformers are sometimes dehydrated by removing the oil and pulling a vacuum inside the chassis for an extended time. That requires that the chassis must be rated to hold a vacuum. ...
0
votes
1answer
93 views

Will reed switches break in various weather conditions

I will be using an OKI ORD-9216 14mm reed switch in my mailbox, which is outside of my house. Below is a picture of a reed switch. I am worried to whether the reed switch's glass will crack due to ...
4
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2answers
142 views

Waterproof Fan Failing In A Chamber With 100% Relative Humidity

So I've built a aeroponic tower that uses an ultrasonic atomizer instead of spray nozzles. This approach is called "fogponics" across the hydroponic community. My Problem is that I have to run a fan ...
0
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1answer
74 views

High temperature+humidty and electronics

I am using a temperature sensor and accompanying devices to prototype a circuit which will be placed in high temperature and humidity conditions. Temperatures up to 40°C and humidity up to 75%. Do I ...
0
votes
1answer
35 views

Multiplexer circuit

I would like to design a circuit to measure the humidity of the soil by connecting sensors to a 16:1 MUX . I have never worked with MUX and i dont know which one to use or where to begin. Can you ...
0
votes
1answer
400 views

STM32F401RE Nucleo failing to read DHT22 sensor

This is my first project and I am trying to read the temperature readings from a DHT22 sensor using a STM32F401RE-NUCLEO board. My code is failing at reading the input from the DHT22 sensor when I ...
4
votes
1answer
210 views

How to bake MSL components for DIY reflow?

I'm intending to reflow solder some components from Analog Devices. Since they are an LFCSP package, hand-soldering is not possible. They arrived with a warning that they are moisture sensitive (MSL3) ...
1
vote
1answer
98 views

What humidity sensors allow the user to configure their I2C address? [closed]

I'm building something that will need to use eight humidity sensors, and I want to use I2C to communicate with them. However, all humidity sensors I've found either have a fixed I2C address, or ...
1
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2answers
667 views

How this soil moisture sensor works?

I’m trying to figure out how the following soil moisture sensor works. It’s obviously, a capacitive sensor where the capacitance change when soil moisture vary. However, as you can see, the sensor is ...
1
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1answer
58 views

Measuring humidity with Honeywell 5030/5031 sensors

I'm trying to hook up Honeywell's 5030 humidity sensor (datasheet here). Figure 10 (on page 7) of the datasheet has a typical application circuit, only I'm not sure why they have also included a ...
1
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0answers
237 views

Condensation resistant humidity sensor

I am working on the controller for a product that incorporates a humidity controlled chamber, such chamber is (generally) kept at rh80-95% but, even in normal usage, it is possible and acceptable that ...
0
votes
3answers
441 views

Raspberry Pi in mineral oil enclosure

I have a project based on a Raspberry Pi. It is intended to work outside, but I thought that humidity will destroy the Pi and the electronics board. I thought about creating a perfect waterproof ...
0
votes
1answer
123 views

How to recalibrate a cheap hygrometer module?

Some time ago I purchased one of these very cheap hygrometer/temp modules made in China. They come for less than 5 EUR. I know, the precision is not very good, but I thought, why not give it a try. ...
0
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0answers
123 views

Vacuum dessication of MSL components?

The standard method of removing moisture from MSL-sensitive SMD components prior to reflow is to bake in an oven for 12 hours or more. Without baking, there is a possibility of popcorning, as the ...
2
votes
2answers
320 views

Simple variable Capacitor circuit to feed ADC

I need to build a humidity sensing circuit that feeds an analogue to digital converter. (This converter is then going to send its signals to a raspberry pi for analysis etc). The sensor will be about ...
8
votes
1answer
224 views

Use of desiccant for storage and delivery of electronics

I have several questions regarding desiccant and electronic components: Is there a rule of thumb on how much desiccant, let's say silica gel, to use per volume unit or per package area unit? Must ...
0
votes
2answers
479 views

How to read out data from this moisture sensor?

I found a cheap moisture sensor on Ebay that only came with the schematic attached. The moisture can be read with an analog or digital signal. However, I am wondering how the opamp creates a digital ...
1
vote
2answers
247 views

Humidity and temperature considerations

I am working on a system similar to a 3D printer, which works with stepper motors, heated bed and an hot air fan. This system will work inside a chamber, with a temperature around 4 degrees and around ...
32
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2answers
3k views

Why are SMD LEDs shipped in a sealed bag containing desiccant?

I had a selection of 0805 LEDs in my last Mouser order and was a bit surprised to discover they arrived in heat-sealed (rather than folded and taped with sticker) bags containing a desiccant bag and ...
0
votes
1answer
778 views

Wire soil moisture sensor such that it only powered when measuring

I am a rookie electronics tinkerer who wants to use the SparkFun soil moisture sensor. I plan on connecting it to ADC MCP3008 to the GPIO pins on a Raspberry Pi. On the SparkFun site the vendor warns ...
0
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2answers
699 views

Calculating actual humidity using sy-hs 220 humidity sensor

I am getting following output from sy-hs 220 humidity sensor. 466 466 467 466 466 i.e. approximate 466. How would I convert it to actual humidity? As from ...
7
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2answers
905 views

How “pinless” moisture meters work?

I see that there are "pinless" moisture meters on the market, e.g., http://www.omega.com/pptst/HHMM257.html that look like this My understanding is that they measure the amount of reflected RF. ...
0
votes
1answer
490 views

Capacitive Moisture Sensor - Is AC or DC better/more accurate?

I am looking into making a capacitive moisture sensor. This has been discussed many times already, but I am not sure what is the better option, AC or DC. I want to run this off of a battery, so DC ...
0
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1answer
353 views

Membrane for sht10 (humidity & temperature) sensor

I made a uC powered device to control the humidity and temperature of a room. I used sht10 sensor. The room humidity provided with a humidifier. The sensor was working well. When trying to test the ...
0
votes
1answer
3k views

How to calibrate HR202 humidity sensor?

I'm doing a project on humidity monitoring using HR202 Humidity sensor and PIC16F877A.I could not find resolution & accuracy of HR202 in online.So please help me to calibrate and use HR202 ...
4
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2answers
214 views

How Cropx works?

This company claims that they can determine accurate irrigation patterns on a terrain just by using 3 sensors (https://www.youtube.com/watch?t=80&v=U48XTXXi_MA). They don't talk about the actual ...
2
votes
3answers
15k views

How do you measure soil moisture using a capacitive sensor?

There are a number of capacitive moisture sensor designs on the internet, which use the insulated copper pads on a PCB.For example: http://zerocharactersleft.blogspot.in/2011/11/pcb-as-capacitive-...
3
votes
1answer
180 views

Wire Wrap Joint in High Humidity

How does a wire wrap joint compare to a soldered joint in high humidity conditions? Corrosion? Electrolysis? Joint resistance creeping up?
-1
votes
1answer
272 views

Best Soil Moisture Circuit

There have been an number of circuits discussed here to detect soil moisture. Most use conductivity of the soil though there is one reference to using a galvanic cell to generate a voltage. What is ...
-1
votes
2answers
569 views

Humidity sensor with more probes

Could you advice how to amend such schema in order to measure humidity on more probes? The 555 is functioning as a resistance-to-frequency converter. A probe (on the left side of schema) is ...
6
votes
5answers
360 views

Is there a sensor that is equivalent to a dry toothpick?

For the non-cooks in the audience the dry toothpick test is used in baking (cakes, banana bread, etc.) to determine when the item is done baking. The procedure is to stick a toothpick into the food, ...
6
votes
1answer
728 views

1-wire humidity sensor with ID

I've created a temperature monitoring system using multiple DS18B20 temperature sensors and now I want to add some humidity sensors to it. The problem is that I cant find any 1-wire humidity or ...
0
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2answers
1k views

How does water damages the phone lines?

Today, we just replaced the phone line which was damaged due to moisture and were causing a great deal of disturbance and noise in the phone. What exactly causes this noise? Does the signals gets ...
5
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3answers
707 views

Moisture Sensitivity Level - More than one chip in sealed bag

I've purchased three WM8804 MSL 3 chips, which came in a sealed moisture-sensitive package with instructions to mount the chips on the board within 168 hours of the bag being opened. However, it is ...
2
votes
1answer
246 views

How much humidity can a microcontroller/embedded device withstand?

I'm working on a project that employs a microcontroller in an 80-85°F environment with quite a bit of humidity. It's going to be placed directly next to an array of fish tanks. Obviously, the water ...