Questions tagged [humidity]

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Capacitive soil moisture sensor and differential switch

While using a capacitive moisture sensor I experience this weird behavior: when I insert the moisture sensor into the ground, the line differential switch breaks. Thus, I need to disconnect both the 5 ...
1 vote
1 answer
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Resistive Moisture Sensors, What is the purpose of the 2N3904 Transistor in the Sparkfun Circuit?

the two circuits below do the same things as far as I can tell, they both measure soil moisture using resistive sensing. However the one from Sparkfun is using a 2N3904 transistor, since the voltage ...
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Feasibility of humidity controlled minifan part 2

Previously, I asked about the type of input that I should employ in my project which is a humidity controlled minifan out of a humistor, and I considered using DC. Now I'm asking how construct the ...
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1 vote
1 answer
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Is low humidity bad for HIPOT testing electrical harnesses?

From what I understand for HIPOT testing high humidity could be a potential issue because if cable insulators absorb moisture that could affect their resistance. What about low humidity? Is there any ...
2 votes
2 answers
262 views

Heating elements on humidity sensors like SHT32 or HTU21D, what are they for?

Why are there heating elements on these small humidity sensors? HTU datasheet, SHT31 datasheet Are they used to calibrate the humidity readings or something like that? I tried using both humidity ...
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1 vote
2 answers
186 views

Using the heater in a temperature/humidity sensor

I'm having trouble understanding how to use the heater in a temperature/humidity sensor. The spec sheet for the HDC1080 says "The heater is an integrated resistive element that can be used to ...
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Grove capacitance soil moisture sensor

I have a Grove soil moisture sensor that works, but I have trouble understanding how the sensor actually works. I think the circuit starts with the 555 timer, that outputs a 487 kHz wave (R1 = 1.5K, ...
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92 views

Why do I have data on all MCP3008 pins with nothing connected

I have an MCP3008 analogue to digital chip connected to my Raspberry Pi 3b ...
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1 answer
263 views

Conformal Coating on Raspberry Pi

I'm planning to build a security camera with a Raspberry Pi 4B in it with the camera being an IR camera I found online. Being a security camera, I'm planning to put it outside my house. Where I live ...
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2 votes
2 answers
92 views

Methods of measuring constantly high air humidity

How can I measure still air in 90-100% RH range with constant 25°C temperature?
2 votes
3 answers
264 views

Why don't we see electronic devices in bathrooms failing under such high humidity?

I recently read that the relative humidity inside a fogged-up bathroom, such as during/after taking a shower, should be close to 100%. And we know that bathrooms these days are filled with all kinds ...
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5 votes
2 answers
205 views

Humidity design requirements

I have to design a electronics device that is specified for environmental operating conditions of 0°C to 60°C with 5% to 95% relative humidity (non condensing). I think the temperature part should be ...
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1 vote
1 answer
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Capacitive distance sensor - humidity influence?

We are using a capacitive sensor to measure displacement (from here: https://www.micro-epsilon.com/displacement-position-sensors/capacitive-sensor/?sLang=en). However, we seem to notice a significant ...
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5 answers
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AHT10 temperature and humidity sensor does not work anymore

I have used the AHT10 before, I liked it, it worked well. After that I bought new a AHT10 but it is not working with my Arduino. I am using this library. I checked closly, and there is only one small ...
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2 votes
0 answers
47 views

Transmission distance with AM2320 temperature and humidity sensor

I'm about to work with a temperature/Humidity sensor, this sensor has to be wired more than 5m and less than 10 m to my PCB board, I was going to use the SHT3xx sensors, these sensors work with I2C ...
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227 views

How to improve humidity sensor (Si7021) accuracy?

I am trying to measure humidity in a textile factory more accurately. I found this sensor Si7021 (circuit was copied from SparkFun this is the link from SparkFun.) It is measuring very good. I am ...
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2 answers
57 views

Soil Humidity sensor value rising over time

So I have this soil humidity sensor placed in a pot. It's about half way in soil, cause that's how deep the pot is. I'm trying to get a pump to trigger once the soil dries out below 20%, but ...
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7 votes
2 answers
303 views

Why does my Vbe multiplier voltage oscillate when wet?

I've built a few Vbe multipliers as cheap temp sensors. I know there are better ways to sense temperature but I am not interested in accurate measurements, and my question is exclusively about a ...
2 votes
2 answers
677 views

How does moisture get into silicon chips?

Many chips have Moisture Sensirivity Level rating (MSL) I am trying to understand how exactly moisture can get into a silicon packaged chip. Every document I read just states it can, but doesn't say ...
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47 views

Bad sensor values with D1 Mini v.3 and soil moisture sensor

I created a simple project using a D1 Mini v.3 connected with a Black 1.2 version soil moisture sensor. Sensor is connected with 5V and the A0 pin on D1. When I run this simple example: ...
-1 votes
1 answer
140 views

Is it reasonable a remote control works after being heated?

The remote control of my TV set is failing and I probably have to buy a new one soon. I changed battery, including from other device that is working, and there was no improvement. But it is ...
4 votes
2 answers
2k views

Capacitive moisture sensor not quite working

I have spent the past few days trying to reverse engineer a capacitive moisture sensor I ordered from eBay a while ago. The particular one I received looks like this: What fascinated me about this ...
2 votes
1 answer
98 views

How much time to wait before sampling new data from soil moisture sensor?

I am working with some cheap soil moisture sensors, as the ones on the picture below. One of the problems of these kind of sensors is that they must not be powered on at all times. If you neglect to ...
1 vote
1 answer
115 views

How does BME280 measure air humidity?

I know that BME280 measures pressure using the piezoresistive effect, I suppose it uses the thermoresistive effect to measure the temperature. How about humidity? Any advice would be appreciated, even ...
1 vote
0 answers
129 views

Capacitance to digital converter for moisture measurement

I'm currently working on a irrigation system for which I would like to build a low cost soil moisture sensor. I would like to measure the moisture levels of a given environment based on a capacitance. ...
1 vote
1 answer
55 views

Extension cord's power socket grounding pin soaked in cleaning agent sud, what is a proper way of cleaning?

I didn't really know what tags to use. Anyways, this might sound stupid, however I was cleaning up something above the extension cord which was laying on the ground, and while I pressed the wipe suds ...
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2 votes
3 answers
222 views

Humidity and Moisture in Submerged Die-Cast Aluminum Enclosures

I have an electronic enclosure (5" x 5" x 4") made of die-cast aluminum alloy (A360). I plan to use it under water (~5 ft) continuously. I first pressure test it: I monitor the pressure inside, while ...
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0 votes
2 answers
144 views

How to use gold finishing to reduce corrosion on a moisture sensor?

Background I have a raspberry pi with a moisture sensor that suffers from corrosion. My setup is similar to the one described in this raspberrypi.stackexchange question about corrosion of a moisture ...
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0 votes
1 answer
61 views

Basic Solenoid Question

I have a super simple question about solenoids. If I wired this, a 120v solenoid valve, to a 3 prong male plug would this cheap chinese humidity controller be able to control it? My assumption is ...
2 votes
2 answers
42 views

Extend life of hygrometer? (Prevent breakdown over time)

Context: I'm working on a gardening project using a microcontroller to power grow lights and other related components after I've built on top of it. Case: I was interested in adding some hygrometers ...
1 vote
2 answers
1k views

Can water condensation appear on PCB in IP67 enclosure box?

Does IP67 box protect PCB from moisture? If not, is it OK to have an outdoor air humidity sensor soldered on PCB in IP67 housing? Also if it doesn't block moisture, is there any reason to use IP65/...
0 votes
1 answer
101 views

Measuring direction of current to determine moisture is present

I am building a moisture sensor with an AC current to prevent electrolysis. The AC will be generated with a simple schmitt trigger oscillator with the midpoint reference set at 2.5V. Water would ...
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1 vote
0 answers
257 views

Honeywell I2C RH Sensor SDA line experiencing fluctuation between Vdd and Vdd/2

I had a problem when implementing I2C communication between NXP Kinetis K50 micro-controller and Honeywell Humidlcon I2C RH sensor. The RH sensor doesn't acknowledge when receiving the default address ...
0 votes
1 answer
90 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
1 answer
134 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 ...
33 votes
9 answers
13k 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 votes
4 answers
548 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 ...
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75 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 ...
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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 vote
4 answers
260 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-...
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1 vote
4 answers
916 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 ...
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1 vote
1 answer
1k 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 ...
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1 answer
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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 ...
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2 votes
1 answer
2k 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 ...
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1 vote
1 answer
336 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 ...
5 votes
3 answers
6k 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 ...
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2 answers
3k 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 ...
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3 votes
1 answer
389 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
1 answer
200 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 ...
3 votes
2 answers
368 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 ...
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