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InvisibleArp
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Registered: 04/20/98
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Quest for a fully automatized climate
    #7965308 - 02/01/08 03:11 PM (16 years, 1 hour ago)


Card (Velleman K8055 USB experiment card) ~$50


Honeywell integrated circuity relative humidity sensor ~$20


Sensor cable connected to USB board


Breathing test of sensor with some real basic visual basic programming :smile:


Connecting the fan


Fan test to see if we can control outputs.

We sure can! :mushroom2::drumming::cheer::monkeydance:


Temperature resistor stolen from an old digital thermometer :captain:


And soldered to the back of the USB experiment card


So far everything is running smoothly :smile:


colors to indicate threshold levels + extra black box


two relays to trigger fan and humidifier


soon to be a box. hopefully :smile:

it's up a running now with a threshold margin of around 10 points.
also adds 10 values and divides by 10 to avoid spikes and give a smoother line.

Significantly less usage of humidifier with this setup.

(23:44:13)-Channel 1 = set on
(23:12:58)-Channel 1 = set off
(23:11:01)-Channel 1 = set on
(22:45:46)-Channel 1 = set off
(22:43:32)-Channel 1 = set on

set on = humidifier on, set off = humidifier off



every graph pixel equals 10 seconds.


*to be continued*



Edited by Arp (02/16/08 09:28 AM)


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OfflineCiv
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Re: aight controller [Re: Arp] * 1
    #7968064 - 02/02/08 10:08 AM (15 years, 11 months ago)

OMG ARP DON'T DO IT!  IMS GONNA HAX IT AND MAKE YOUR CUBES TURN INTO PORTS.

Let us know how it goes :smile:


--------------------
"...Gal's seem to hate the thought of blending chicken shit in a blender.
So, wash it well afterwards & DON'T tell them..."  -Agar


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InvisibleArp
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Re: aight controller [Re: Civ]
    #7985608 - 02/06/08 03:54 AM (15 years, 11 months ago)

The programming is about done, sorta. Now waiting for my mate to connect the components and stuff, probably on friday :smile:


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InvisibleArp
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Re: aight controller [Re: Arp]
    #7994988 - 02/08/08 06:16 AM (15 years, 11 months ago)

BumP! :cheers:


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OfflineRogerRabbitM
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Re: aight controller [Re: Arp]
    #7995036 - 02/08/08 06:46 AM (15 years, 11 months ago)

My experience with humidity transducers is they don't function well above 70%. Perhaps you've found a better one. I work as an electrical engineer in a MS data center. We have a lot of moisture sensitive equipment, and even the $2,000 transducers freak out whenever it rains, and in this part of the world, that's a LOT.
RR


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"I've never had a failed experiment.  I've only discovered 10,000 methods which do not work."
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InvisibleArp
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Re: aight controller [Re: RogerRabbit]
    #7995046 - 02/08/08 06:56 AM (15 years, 11 months ago)

at room temperature, this one is supposed to be very accurate between 0-100%, and stable over 70%. according to specs.

consumer laws are tight here, and it was bought from a reputable place :smile:

so far so good. if a drop would short it out it'll return 0 until evaporation and resume function.

will be keeping the humidity around ~95%, so shouldn't really be a problem :smile:


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InvisibleArp
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Re: aight controller [Re: Arp]
    #7995389 - 02/08/08 09:20 AM (15 years, 11 months ago)

Bump. Now with temperature sensor, and everything's running smoothly


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OfflineRogerRabbitM
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Re: aight controller [Re: Arp]
    #7996284 - 02/08/08 01:31 PM (15 years, 11 months ago)

I've thought about wrapping the transducers in tyvek, but haven't got around to trying it yet. If yours get shorted out with droplets, it might be something to try.
RR


--------------------
Download Let's Grow Mushrooms



semper in excretia sumus solim profundum variat

"I've never had a failed experiment.  I've only discovered 10,000 methods which do not work."
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InvisibleArp
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Re: aight controller [Re: RogerRabbit]
    #7996478 - 02/08/08 02:24 PM (15 years, 11 months ago)

was thinkin the same. will know in a month moving to new place :confused:


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Invisiblepoke smot!
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Re: aight controller *DELETED* [Re: Arp]
    #7996590 - 02/08/08 02:54 PM (15 years, 11 months ago)

Post deleted by poke smot!

Reason for deletion: x



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InvisibleArp
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Re: aight controller [Re: poke smot!]
    #7999600 - 02/09/08 10:29 AM (15 years, 11 months ago)

Thanks for your post :thumbup:

Hopefully this sensor will work, if not I'm going to purchase one of those with the heating element.

Allthou I rarely had any problems with condensation from humidity ranging around 90-95%, and regular cheap hygrometers seemed to keep up with the wet/dry bulb


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Offlinecosmoline
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Re: aight controller [Re: Arp]
    #7999685 - 02/09/08 11:03 AM (15 years, 11 months ago)

I second the arduino. Good job though.


--------------------
Buy the ticket, take the ride.


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InvisibleArp
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Re: aight controller [Re: RogerRabbit]
    #8003707 - 02/10/08 05:32 AM (15 years, 11 months ago)

Quote:

RogerRabbit said:
I've thought about wrapping the transducers in tyvek, but haven't got around to trying it yet. If yours get shorted out with droplets, it might be something to try.
RR




Was thinking that spores might confuse the sensors as well? You think tyvek will keep them out?


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OfflineLoWgRoW
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Re: aight controller [Re: Arp]
    #8004040 - 02/10/08 10:01 AM (15 years, 11 months ago)

good stuff. input input input. share the code!:crazy2:


--------------------
Avoid negative people.


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InvisibleArp
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Re: aight controller [Re: LoWgRoW]
    #8007767 - 02/11/08 06:52 AM (15 years, 11 months ago)

sure thing. when it's somewhat finished, and if there's a demand :smile:


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Invisibledesertturtle
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Re: aight controller [Re: Arp]
    #8014655 - 02/12/08 07:42 PM (15 years, 11 months ago)

Interesting, keep it up!:popcorn:
Blows my mind, 5:mushroom2: for you!


--------------------
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InvisibleArp
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Quest for a fully automatized climate [Re: Arp]
    #8021363 - 02/14/08 08:19 AM (15 years, 11 months ago)

*bump* updated! everything works according to plan :smile:


Edited by Arp (02/14/08 10:02 AM)


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InvisibleArp
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Re: Quest for a fully automatized climate [Re: poke smot!]
    #8021746 - 02/14/08 10:11 AM (15 years, 11 months ago)

http://www.futurlec.com/Gas_Sensors.shtml

something I thought could be interesting (the co2 sensor)? :tongue:
perhaps it won't work with high humidity.


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Invisiblepoke smot!
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Re: Quest for a fully automatized climate *DELETED* [Re: Arp]
    #8021784 - 02/14/08 10:23 AM (15 years, 11 months ago)

Post deleted by poke smot!

Reason for deletion: x



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OfflineErik006
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Registered: 07/13/03
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Re: Quest for a fully automatized climate [Re: poke smot!]
    #8026715 - 02/15/08 10:54 AM (15 years, 11 months ago)

I suggest taking a close look at the data sheet, since it actually has a graph describing the output of the system over a range of humidity levels. The graph seems to go up to about 85%, which indicates that it's probably not very suitable for this sort of application.

Furthermore, since the humidity range from 85% - 100%RH is unknown, you'll have to perform a static calibration of your sensor to find out E0. This means you need another CO2 sensor with known accuracy & bias & precision error to be able to estimate the true C02 value & use that to calibrate your sensor.

Most likely you don't have that kind of equipment lying around, so the best you'll be able extrapolate the curve to estimate what value you *could* be getting. Ofcourse, since the calibration curve shown in the data sheet isn't linear at higher humidity levels, you really don't know what to expect.

Erik006


--------------------
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InvisibleArp
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Re: Quest for a fully automatized climate [Re: Erik006]
    #8030568 - 02/16/08 09:30 AM (15 years, 11 months ago)

phew thanks for the info. won't be trying then


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Invisiblepoke smot!
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Re: Quest for a fully automatized climate *DELETED* [Re: Erik006]
    #8030934 - 02/16/08 11:39 AM (15 years, 11 months ago)

Post deleted by poke smot!

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Offlinecosmoline
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Re: Quest for a fully automatized climate [Re: poke smot!]
    #8035618 - 02/17/08 09:39 PM (15 years, 11 months ago)

For a cheap, accurate temperature/RH sensor sensirion's SHT11 looks like the way to go. I finally got my sample months after I submitted it. The only problem with this sensor is that is has SMD connections which you really need to have a circuit board to mount it on. I'm going to make a HCL/h202 bath and print some simple ones out. If any of you are also working with this same sensor PM me with interest and I will print out a big batch.


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Invisiblepoke smot!
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Re: Quest for a fully automatized climate *DELETED* [Re: cosmoline]
    #8036891 - 02/18/08 07:42 AM (15 years, 11 months ago)

Post deleted by poke smot!

Reason for deletion: x



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Offlinejoesmithjoe
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Re: Quest for a fully automatized climate [Re: poke smot!]
    #8052081 - 02/21/08 02:12 PM (15 years, 11 months ago)

I am really interested in this. I am planing on trying my had at designing a tec. that makes it almost as easy to grow pan as it is to grow cubs. The hardest part is getting the humidity right during fruiting imo so a project like this would cure that problem.


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Offlinecosmoline
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Re: Quest for a fully automatized climate [Re: poke smot!]
    #8052232 - 02/21/08 02:56 PM (15 years, 11 months ago)

Quote:

poke smot! said:
cosmoline, there are SHT71's which have leads and do not require any smt stuff.






they have leads but are only accurate to 80% rH.


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Invisiblepoke smot!
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Re: Quest for a fully automatized climate *DELETED* [Re: cosmoline]
    #8052617 - 02/21/08 04:32 PM (15 years, 11 months ago)

Post deleted by poke smot!

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Offlinecosmoline
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Re: Quest for a fully automatized climate [Re: poke smot!]
    #8055046 - 02/22/08 01:47 AM (15 years, 11 months ago)

Quote:

poke smot! said:
That is what the data sheet says. They do read up to 99%. With the internal condensation heater it seems these are very close to readings that were obtained using a small digital hygrometer similar to the ones people are using in their terrariums already.




Those hydrometers don't use digital humidity sensors, its all analog. If you want real accuracy you gota go digital. I'm gona stick with the sht11 or even better sht10. I already have circuit board layouts and will have them printed this weekend. The best part of using these is that the sht10 is only like 10$ from china and is accurate to 100%. This project is coming along well for me, expect to see good things from me in the future.


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OfflineLoWgRoW
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Re: Quest for a fully automatized climate [Re: cosmoline]
    #8055468 - 02/22/08 08:22 AM (15 years, 11 months ago)

again great work! I can't wait to see how it in action.


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OfflineShibariSmurf
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Re: Quest for a fully automatized climate [Re: cosmoline]
    #8201492 - 03/27/08 01:07 PM (15 years, 10 months ago)

I'm in the final stages of putting together the arduino SHT71 system. My test show that the 71 is accurate within 2% when RH is over 90% (ie. if RH=90% than it reads 88% or 92%) this is within what I'm looking for so it works just fine and is better than the data sheet indicates.


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Invisiblepoke smot!
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Re: Quest for a fully automatized climate *DELETED* [Re: ShibariSmurf]
    #8202215 - 03/27/08 04:47 PM (15 years, 10 months ago)

Post deleted by poke smot!

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Offlinetheratatat
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Re: Quest for a fully automatized climate [Re: poke smot!]
    #8271706 - 04/11/08 09:48 PM (15 years, 9 months ago)

I just thought I would add my two cents to this one, even though its late in the game.

I am actually using the SHT11 for controlling humidity with an ultrasonic transducer. I have attached a screenshot of the web interface I built for it.



As you can see I am able to keep my humidity fairly even with this sensor. I am really happy with this sensor, except for a I had one crap out on me really early and had to send for a new one.

I have indeed wrapped my sensor in tyvek and have had really good luck since then. It doesn't really hurt the response time much.

Cheers


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