Questions tagged [humidity]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
2
votes
2answers
578 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 ...
0
votes
0answers
41 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
1answer
42 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
2answers
154 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 ...
0
votes
0answers
55 views

What is the resistive humidity sensor working principle in DC vs AC?

I have to make a weather station project using the PIC16F887 uC, powered with 5V DC, and it is mandatory to have an analog humidity sensor conditioned with a circuit using opamps (up to 3). I was ...
2
votes
1answer
50 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
1answer
36 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
0answers
67 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
1answer
44 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 ...
1
vote
3answers
142 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 ...
0
votes
2answers
91 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 ...
0
votes
1answer
59 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
2answers
36 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
2answers
443 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
1answer
74 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 ...
1
vote
0answers
232 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
1answer
88 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
91 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 ...
30
votes
9answers
10k 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
4answers
346 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
votes
0answers
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 ...
0
votes
0answers
5k 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
vote
4answers
173 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-...
1
vote
4answers
826 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
725 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
votes
1answer
35 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 ...
2
votes
1answer
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 ...
1
vote
1answer
235 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
3answers
4k 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
votes
2answers
2k 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
232 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
133 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
2answers
248 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
votes
1answer
86 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
47 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
630 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
428 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
179 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
vote
2answers
2k views

How does this capacitive soil moisture sensor work?

I’m trying to figure out how the following soil moisture sensor works. It’s obviously a capacitive sensor where the capacitance changes when the soil moisture varies. However, as you can see, the ...
1
vote
1answer
90 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
vote
0answers
433 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
752 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
174 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
votes
0answers
182 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
430 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
551 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
1k 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
406 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 ...
34
votes
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
1k 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 ...