Comments on: ESP8266 NodeMCU with TDS Sensor (Water Quality Sensor) https://randomnerdtutorials.com/esp8266-nodemcu-tds-water-quality-sensor/ Learn ESP8266, ESP32, Arduino, and Raspberry Pi Tue, 22 Aug 2023 09:45:12 +0000 hourly 1 https://wordpress.org/?v=6.8.2 By: Sara Santos https://randomnerdtutorials.com/esp8266-nodemcu-tds-water-quality-sensor/#comment-856427 Tue, 22 Aug 2023 09:45:12 +0000 https://randomnerdtutorials.com/?p=109596#comment-856427 In reply to ed.

Yes.
That’s right.
Thanks for that explanation.
Regards,
Sara

]]> By: ed https://randomnerdtutorials.com/esp8266-nodemcu-tds-water-quality-sensor/#comment-856169 Sun, 20 Aug 2023 20:58:48 +0000 https://randomnerdtutorials.com/?p=109596#comment-856169 The TDS sensor is interesting. The interface that the probe connects to uses a CD4060 to generate a signal of approx 2700 Hz (if my quick, top of my head calculation is right) (1/(2.310k1nF)/16 that is amplified and fed to the probe.
The probe, basically being 2 elecrodes to be dipped in water, forms a voltage divider with an 1M ohm resistor. The output of this voltage divider is then fed to 3 amplifiers, a low pass filter and is rectified as it appears as an analog signal on the output of the interface board.

So if we simplify it’s workings, it is not much different from the probes we use to measure soil moisture. Those actually do not measure moisture either, but just the amount of ions in the soil

]]> By: wayne willoughby https://randomnerdtutorials.com/esp8266-nodemcu-tds-water-quality-sensor/#comment-783163 Tue, 13 Sep 2022 11:19:30 +0000 https://randomnerdtutorials.com/?p=109596#comment-783163 Hi
Yes i would be interested in a web based aquarium monitor. I have learned by building and modifying your ESP8266 web server, but I still consider myself a newbie and am keen to learn more.
Regards
Wayne

]]> By: Sara Santos https://randomnerdtutorials.com/esp8266-nodemcu-tds-water-quality-sensor/#comment-736626 Fri, 08 Apr 2022 09:39:01 +0000 https://randomnerdtutorials.com/?p=109596#comment-736626 In reply to 1Pats.

Hi.
No, I can read your comments just fine.
They just need to be approved first.
To measure nitrites you need a specific test.
Basically, you need to add a specific chemical component (a chromophore that connects to nitrites) to a water sample and then, read the absorbance at a specific wave length.
I don’t think something like this is available for these boards.
Regards,
Sara

]]> By: Bob Wareham https://randomnerdtutorials.com/esp8266-nodemcu-tds-water-quality-sensor/#comment-736618 Fri, 08 Apr 2022 08:53:50 +0000 https://randomnerdtutorials.com/?p=109596#comment-736618 Very interesting TDS if you want to calibrate the sensor you can use steam distilled water and that should be zero.

I use the above to test my handheld TDS meter, and it works, thanks for the article

]]> By: 1Pats https://randomnerdtutorials.com/esp8266-nodemcu-tds-water-quality-sensor/#comment-736603 Fri, 08 Apr 2022 07:41:56 +0000 https://randomnerdtutorials.com/?p=109596#comment-736603 Had lost access to comments.

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