Automated Green House Blog:10 - Three Dollar EC PPM Meter for MCU

RE: Automated Green House Blog:10 - Three Dollar EC PPM Meter for MCU

tonttu — Sat, 28 Nov 2020 16:23:59 GMT

Nice project. Now I'm really curious if the polarization could be minimized with taking two measurements per cycle, but flipping the HIGH and LOW in between, so it would be kind of square wave ac.

RE: Automated Green House Blog:10 - Three Dollar EC PPM Meter for MCU

gabri84 — Sat, 18 Apr 2020 13:29:16 GMT

Hi! congratulations for your work! 'm also experimenting with arduino from some years trying to monitor and automate climate, irrigation, etc ... I would be happy to show you if you were interested ... but unfortunately my knowledge of programming, but above all of electronics, is often not enough.

I am having difficulty rewriting the sketches to calibrate and monitor EC-PPM ("three dollars EC PPM meters") for Wemos D1 mini (ESP8266) (although you have already answered questions in the comments somewhere ... I did not understand how to integrate the piece of code you posted).

bye

Gabriele

RE: Automated Green House Blog:10 - Three Dollar EC PPM Meter for MCU

orion555 — Thu, 31 Oct 2019 16:32:29 GMT

I have used a resistor for now anyway, but if I don't have to solder an extra part in, I definately won't be upset either.

So it's most appreciated that you posted the link. Thanks a lot.

RE: Automated Green House Blog:10 - Three Dollar EC PPM Meter for MCU

orion555 — Thu, 17 Oct 2019 13:27:33 GMT

Hi Michael,

I discovered your EC-Meter El Cheapo a while back and I tried it and it worked just fine, except that I used a different temp sensor which wasn't doing too well (extreme fluctuations in temperature, which led to fluctuations in the EC reading accordingly...) But nevertheless, you did some really fantastic work there and it'smost appriciated from my side. Thanks a lot.

In the meantime I organized the recommended DS18B20 sensor, but I can't find your download file with the specialised onewire & dallas files anywhere. Could you be so kind and send me a download link or the files?

Regards

RE: Automated Green House Blog:10 - Three Dollar EC PPM Meter for MCU

fatfriday — Sat, 14 Jan 2017 05:11:50 GMT

Hi - I just discovered your setup. I was wondering if I would need to change anything to have this work on a Mega 2560

thanks

RE: Automated Green House Blog:10 - Three Dollar EC PPM Meter for MCU

abri — Mon, 17 Oct 2016 13:08:45 GMT

This is a great article. I am trying to do this with a Raspberry Pi with a Sainsmart Uno as slave. Has anyone converted this script to Python by any chance? I am in South Africa, so I am using a Euro plug - any idea what the K-factor should be more or less?

The values I am getting when I am trying to calibrate does not seem to be constant. It is either dropping for quite a while before stabilising, or it is stable and then starts increasing with every reading. Not sure what the cause can be.

RE: Automated Green House Blog:10 - Three Dollar EC PPM Meter for MCU

krantz — Thu, 09 Jun 2016 19:30:28 GMT

Dear Mike,

I made a prototype on an Arduino Uno, and it seemed to be working fine (I made it with a 16x2 screen).

My final version was on a Nano -- but for some strange reason, my EC readings are extremely low (the PPM measures are low as well).

I can tell the probes are working because values do change, but they never really change much.

Do you have any idea what could I possibly be doing wrong? I believe the issue is on the software side of the project, but solution escapes me.

Thanks for this, it´s really appreciated.

Regards,

Edgar

RE: Automated Green House Blog:10 - Three Dollar EC PPM Meter for MCU

e14 Contributor — Wed, 25 May 2016 21:31:13 GMT

Michael,

I really appreciate these write-ups! I am currently trying to implement your pH and the EC meters in my hydroponic garden. I have been able to get each to work separately on a freedom k64f board, but when I try to run both the pH readings are erratic at best. Have you implemented them both in the same reservoir? If so, do you have any advice on getting both to output reliable readings? I have tried delays between readings, but that hasn't worked. The tests have been run in a plastic cup, much like you use in your EC videos. I appreciate any help you can give!

James

RE: Automated Green House Blog:10 - Three Dollar EC PPM Meter for MCU

m.ratcliffe — Thu, 03 Sep 2015 20:36:58 GMT

Well Guys there is some good news on the PH Front, we all know the Ph Probes are Expensive. Ive just been playing about with the plug sensor and some basics/acids solutions, there is something going on that we can measure with the arduino, I dont know what effect I am measuring but I can so far determin if the PH is below or above 7.

Maybe if I can get to understand what effect I am seeing we can get some better values for PH from the same $1 probe.

RE: Automated Green House Blog:10 - Three Dollar EC PPM Meter for MCU

DAB — Thu, 03 Sep 2015 19:55:33 GMT

Nice detailed post.

I wonder what makes the probes die?

DAB