Automated Green House Blog:10.1 - Update Code For Three Dollar EC PPM Meter for MCU

RE: Automated Green House Blog:10.1 - Update Code For Three Dollar EC PPM Meter for MCU

cosax — Mon, 13 Jul 2020 15:20:07 GMT

Hello all

has anybody managed to make this with arduino nano? Do you know the internal resistance of the digital pins?

RE: Automated Green House Blog:10.1 - Update Code For Three Dollar EC PPM Meter for MCU

magg58 — Thu, 02 Aug 2018 05:41:51 GMT

Michael

thank you, it is a really nice project, works excellent!!, best regards

RE: Automated Green House Blog:10.1 - Update Code For Three Dollar EC PPM Meter for MCU

williamsimson — Thu, 09 Nov 2017 13:39:59 GMT

Hi Michael,

I want to follow ur system to my arduino UNO

but i cannot find links for downloading the libraries

will it work without the libraries

or i need to download first

Hi I have found the links

so my next questions are

can we measure the PH dan DO2 using the same method?

thank you

RE: Automated Green House Blog:10.1 - Update Code For Three Dollar EC PPM Meter for MCU

khios — Tue, 26 Sep 2017 23:11:12 GMT

No sure if your still about but the uptime counter seems to be gaining a whole log of time. it seems to gain a full day every 6 hours approx. currently 6 days 11 hrs when its been up 1.5 days.. Any thoughts? Im using a mega. tried to adapt for a nano but the ec sensor was going nuts (getting a -k etc.. )

Fully impressed how simple this was to make and modify ( adding a DHT sensor to monitor temp and humidity in the hydro area.)

i'm using a Aussie 2 pin plug for a probe at the moment.. k is approx 2-2.33 going to try a probe from nicrome wire and a pen .. just got to factor in the resistance of the wire i guess?

now to find a way to kick the airpump onto a battery airpump in case of a power cut and all be sorted. [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-aa55ada5-b757-460b-a211-f76a851c5a69/6825.contentimage_5F00_1.png:16:16]

again thanks for your hard work. loving your projects so far [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-aa55ada5-b757-460b-a211-f76a851c5a69/6825.contentimage_5F00_1.png:16:16]

RE: Automated Green House Blog:10.1 - Update Code For Three Dollar EC PPM Meter for MCU

utthawut — Tue, 17 Jan 2017 13:42:18 GMT

Vdrop= (((Vin)*(raw))/1024.0); should be changed to Vdrop= (((Vin)*(raw))/1023.0); right? because the maximum value of raw is always 1023.

RE: Automated Green House Blog:10.1 - Update Code For Three Dollar EC PPM Meter for MCU

jasp — Sat, 01 Oct 2016 12:27:25 GMT

Can I do this also with Arduino Uno R3 or only with Arduino mega?

RE: Automated Green House Blog:10.1 - Update Code For Three Dollar EC PPM Meter for MCU

balearicdynamics — Thu, 02 Jun 2016 04:55:30 GMT

I appreciate also your determination continuing and sure completing this project. It is really good; these detailed descriptions become historical reference for the future. It is just following the last year (and this most recent) challenge that I have reviewed this PiIoT challenge strategy to post the articles.

Enrico

RE: Automated Green House Blog:10.1 - Update Code For Three Dollar EC PPM Meter for MCU

krantz — Thu, 02 Jun 2016 00:20:15 GMT

Thank you so much for sharing this knowledge. I really appreciate it.

Two questions:

1) Can I use an Arduino Nano instead of a Mega?

2) How can I use both the "original" libraries and the "custom" libraries? You see, I already got a project up and running --- using the original libraries from DallasTemp and OneWire -- I am affraid that if I change something in my computer, on the next compilation something will get screwed....

Regards.

RE: Automated Green House Blog:10.1 - Update Code For Three Dollar EC PPM Meter for MCU

Former Member — Sun, 06 Mar 2016 19:18:41 GMT

Alternative download it at: www.MichaelRatcliffe.com/projects

Is there place to download source and libraries? The link mentioned says coming soon. Thanks in advance.

Gerald

RE: Automated Green House Blog:10.1 - Update Code For Three Dollar EC PPM Meter for MCU

Former Member — Sat, 03 Oct 2015 09:28:35 GMT

I am trying to make order in the mess I have here (not related to you)

1. For your design, from the socket I get two wires and attach a resistor to one

-The other one without resistor will be your ground?

- The wire attached to resistor and goes directly to Arduino not via resistor will be EC sensor?

- The one going via resistor will be EC POWER

Or the last two are the other way around?

2. Can I have a copy of your code without the LCD functions? or link to download?

RE: Automated Green House Blog:10.1 - Update Code For Three Dollar EC PPM Meter for MCU

m.ratcliffe — Fri, 25 Sep 2015 17:24:48 GMT

I got an email regarding this project "

I'm new Hydro trying to setup a monitor system to a friend.

I am with EC sensor now

I bought one from Web not sure it's reading well, and I have one more coming via post from US

But I want meanwhile to study this topic and also seeing your video I might be able to create such cheap sensor for kids I teach in school, it will be mainly DIY for them

So couple of questions if I may

I do not have a solution with known EC, I will use tap water assuming it is 1.2. Is it OK?

I used 1k resistor

I will use different temperature sensor (https://www.sparkfun.com/products/11050)

Temperature Sensor - Waterproof (DS18B20) - SEN-11050 - SparkFun Electronics

SEN-11050: This sealed digital temperature probe lets you precisely measure temperatures in wet environments with a simple 1-Wire interface. The DS18B20 provides 9 to

Read more...

Remove preview

So to calibrate all I need

1. Change temperature calling functions before and after the loop (//************Estimates Resistance of Liquid ****************//

2. Change the value of CalibrationEC

3. Change and play with k

That is all?

Hi Roni, it is great that you are wanting to play around with this EC probe.

1> Your Temperature sensor is the same unit but in a plastic housing [And mine cost $1] So you will not need to change any of the code. I am using a modified onewire.h and dallas.h, you can download them from www.michaelratcliffe.com/projects with the EC code, or add a pull up to the data line of the temp probe [google arduino, "Tempprobe name pullup"].

2> In the new code you can calibrate by the LCD screen [$3 on ebay]

3> If you dont have a known solution to calibrate against, stick with the standard values for K [EU or USA plug now added] they will give good estimates until you get some fluid to calibrate, this will be better than calibrating using a unkown value [tap water can vary from 0.1 to 0.5].

Only other thing to note is, pick a plug the students cannot plug into the wall [see above video/pinout] and be aware that the plug needs to be hung in the solution not touching the bottom or sides [it will give bad readings].

If you want to use this probe to control an aquaponics unit, check out the new blog:

Automated Green House Blog:11 - Self Optimising Automated Nutrient Doser

Need any more help, I will ussualy get back to you in 24hrs.

Mike