The tag has no usage guidance.

learn more… | top users | synonyms (1)

-2
votes
0answers
34 views

Zigbee Soil moisture sensor project issues

In a project I am doing, I have to send analog readings of a soil moisture sensor through zigbee. I have connected the sensor Vcc to 5v and ground; the zigbee Vcc to 3.3v and ground. The analog pin of ...
3
votes
2answers
70 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
44 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
votes
1answer
58 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
203 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
votes
2answers
80 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 ...
0
votes
2answers
707 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: ...
3
votes
1answer
107 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
151 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
185 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
279 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, ...
4
votes
1answer
265 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
votes
2answers
243 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
votes
3answers
587 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
141 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 ...
0
votes
1answer
105 views

Will Renesas V850ES/Jx3-E support 1 wire protocol (max detect temp/humid sensor)?

I would like to connect the DATA pin of sensor to Digital I/O pin of a microcontroller. I am confused that in the data sheet of the sensor they have mentioned this: MaxDetect 1-wire bus is used ...
1
vote
2answers
393 views

Does moisture affect electronics?

So the situation is the following: I'm making half a dozen of my own electrical circuits which I would store in a long wooden box along with my micro ATX motherboard and the rest of my pc. The big ...
4
votes
1answer
787 views

PID implementation for a Humidity controller

I'm working on a humidity controller which uses PID algorithm to control the process values. I have to implement 2 PID routines as there are 2 process values ( Humidity and Temperature) to be ...
2
votes
1answer
2k views

Converting an ADC value to equivalent Temperature?

I'm working on a humidity controller which also controls the temperature inside a chamber.I'm done with the hardware (though i'm not the one behind the design)and which was originally designed with ...
1
vote
2answers
2k views

How does this soil moisture sensor work?

I found information on how a capacitance moisture sensor works, but I couldn't find any information on how the following sensor works. What is the theory behind this sensor?
4
votes
2answers
102 views

Does humidity relate to static sensitive?

Are components more static-sensitive in drier places or vice versa?
2
votes
3answers
4k views

Ideal temperature and humidity for preventing problematic ESD conditions?

I know manufacturers often keep components sensitive to ESD problems in climate controlled rooms and I'm just wondering what the ideal temperature and relative humidity is to prevent ESD problems?
2
votes
1answer
250 views

Will an oscillator be able to drive a transmission line

I want to build a soil moisture measurement probe based on this idea: An oscillator feeds a transmission line burried in a soil via a termination resistor R1, XOR gate acts as a phase shift ...
0
votes
1answer
562 views

Experience with gel-filled junction boxes

A lost answer to one of my questions mentioned gel-filling junction boxes for moisture protection. Has anybody worked with this technique before? I am particularly interested in how difficult it is ...
2
votes
1answer
202 views

Weatherproofing coax connections

I have coax-connectors connecting two cable runs that are subject to weather. Typically weatherproofing is done by wrapping the connection in suitable tape. This is a fairly messy solution if the ...
3
votes
2answers
399 views

Is there any accurate Temperature, Moisture or pressure reading strip?

I was wandering if there is any such sensor, that would read pressure, temperature or moisture ( approximately 12 inch long strip)? I want to be able to dip this sensor into water and have it be able ...
3
votes
3answers
6k views

Can a device be damaged by water even if there is no power supplied?

For example, say I submerged a computer mouse entirely. Assuming that I ensured that all traces of the water were gone, would the device suffer any issues? It is my understanding currently that ...
2
votes
1answer
468 views

Determine humidity level of PCB circuit

How do I determine the minimum and maximum humidity allowed for a PCB mounted with IC's? (Without having to use some sort of humidity chamber) EDIT: During operation.
6
votes
5answers
2k views

What are viable approaches to a circuit to detect wet/moist cloth (bed-wetting)?

Trying to design a circuit that can reliably detect a situation where a child wets their bed. The 3 key requirements are -- Reliability of the approach Ease of use, i.e. a no-fuss approach Child's ...
5
votes
3answers
5k views

ICs with humidity or moisture sensitivity - bake recommendations

I purchased some ICs recently that included something I'd not seen before - a moisture 'sensor' on a paper strip with color indicators for a few specific levels of humidity. Once the paper reaches a ...
2
votes
1answer
910 views

Advice a humidity sensor with I²C interface

I like to interface a humidity sensor over the I²C bus. It should come in a small package, and consume little power. Accuracy isn't that important. I'm using the DS1621 as temperature sensor, I'd ...
3
votes
2answers
342 views

Are PTC/resettable fuses really moisture senstive?

I recently bought some 0805 Multicomp PTC/resettable fuses from Farnell. They were MC36213 (500mA) and MC36206 (200mA). I plan to use these in product which may exist in a high humidity (~80-90%) ...
9
votes
7answers
3k views

Soil moisture measurement

Background To kick-start my longstanding ambition of getting back into electronics, I decided to try and make a device that measures the soil moisture of potted plants to determine whether they need ...
15
votes
6answers
19k views

What's the best way to protect a board from corrosion in a hot/moist environment?

Some of my projects need to live outside for long periods. Sometimes, moisture gets into the enclosures. That means that a circuit board might be sitting around in contact with water for hours on ...
6
votes
1answer
209 views

High Temperature Humidity Sensor

Where can i get a high temperature humidity sensor for temperatures up to 700 or 800 degree Fahrenheit?
10
votes
3answers
591 views

Best humidity/temperature sensor for a nappy?

Special needs kids have big troubles with potty training. A 'wee-wee' alarm would be of a lot of help. What would be a good way of detecting 'it' without electrocuting anybody? A possibility would be ...