Hi there, May I know is this sensor compatible for Raspberry Pi 3 microcomputer?One more question Is this sensor can be use for industrial propose thanks.

Hello, Is the material of the sensor head certified for hygiene and safety?
I plan to install the sensor at the water outlet of the RO purifier, so I will directly drink the water that passes through this sensor. Tks!

hello! when i try to calibrate the 12.88ms/cm solution one measurement is 0 and the next one is 6. the 1413 uS was calibrated but this one has bad measurements

Hello, is there any calibration certificate together with this type of sensor? Thanks

Yes you could, our sample code in the wiki shows you how to get the TDS value from our sensor.
And you could calculate the EC value from the TDS value
EC = TDS * 2

Hello DFRobot

Where can I find links of below libraries to download?

1. OneWire.h
2. ESP8266WiFi.h
3. BlynkSimpleEsp8266.h
4. DallasTemperature.h
5. EEPROM.h
6. GravityTDS.h
7. ESP8266WiFi.h
8. SimpleTimer.h

Through Arduino Library manager in IDE there are multiple options shown. There could be dependency issues. Can you provide exact links to download above required libraries in Arduino environment? so that, everything works seamless. Your help is appreciated..

Since the calibration parameter has to be stored into the EEPROM. So we think the current library could not satisfy your needs.
If possible, you need to use an external EEPROM to record the calibration data yourself and modify our library files.

It's might because your EEPROM has stored some old data.
So maybe you could upload the EEPROM earse program and then calib the sensor again.
The EEPROM earse program you could find in the this wiki：
https://wiki.dfrobot.com/Gr...

Hello, could you give me information about product's Lifetime and maintenance of sensor

Hi, Yes, the sensor can be immersed in water for long periods of time

Hello, i just bought this sensor and i just found out
sensor range 0-1000 ppm. but i try to put it in 1400 ppm solution and when i upload it the value is the same on serial monitor.
I'm confused because the value range is only up to 1000ppm.
is there something wrong?

Could you explain how to calculate the voltage to EC formula used in the code

After successfully getting the sensor up and running with an Arduino, I attempted to lengthen the leads on the probe. When I fired the unit back up, the board stopped giving any output and continuously reads 0 ppm (power LED is on).

I purchased a 2nd unit and experienced the same results. Afterwards I measured the resistance of the probe with the additional leads and found it had changed from about 0.7M to around 2.0M.

I am assuming the higher probe resistance is somehow causing failures and can be fixed by installing a resistor in parallel with the sensor so as to bring the resistance back down to 0.7M, does this sound right?

I'm having a 3rd unit shipped this week and am hoping not to blow this one.

For How many time can i keep the probe in water
What is the Life of the Probe

Hello,
for TDS sensor

how to do a calibration when the system is installed and has no access to the arduino IDE.
I can have a solution at the known ppm on site, but I need to be able to launch the calibration autonomously on my device.
thanks for your help.
cordially
Patrick POURMONET
[email protected]

If the sensors are connected to the same system, this allows each to have the same voltage common. For example, the ground of the earth can have a voltage difference between two different locations. For this case, you need a signal isolator is required. If you have the sensors connected to the liquid of the same vessel or piping, you will be fine without one.

Based on the schematic, the range is dependent on the probe's resistance and the resistance of the water. Vout of OpAmp C has an output voltage equal to (5600/Rprobe& water) times 0.204. The 0.204 is the output voltage of OpAmp A. The 5600 is the feedback resistor for OpAmp C. If you wish to extend the range, place a resistor in series with the probe wiring. Using a 300 ohm resistor, you can get a TDS near 3,250 for the 2.3 V output. This equates to 5,000 micromhos.

For those who are interested as to why the voltage output of the board is limit to approximately 2.3V, this is because of the diode on the board (= 3V board supply -0.7V drop by diode).

Conductivity is the inverse of resistance. And there is a ratio between TDS and conductivity. That ratio is dependent on the salts in the water. Generally speaking, brackish water would have a ratio of 0.65; sea water at 0.50. If you are dealing with pure salts, you need to determine the ratio for it.

when calibrated, the ppm number shows the same value as the manual sensor handheld TDS meter. but when i unplug the arduino and run it again, the arduino TDS sensor shows different results where the arduino tds sensor shows a value of 1800 ppm and the handheld TDS sensor 1000 ppm. Is there any way to fix it?

Hi, the sensor seems to work fine in range from 0 to 134 ppm, from there the value remains the same regardless of whether the ec of the liquid increases, the output voltage remains at 0.44V. Any idea what is wrong?

Hello, I am working on TDS sensor and i Want to know how that formula can be calculated
tdsValue=(133.42*compensationVolatge*compensationVolatge*compensationVolatge - 255.86*compensationVolatge*compensationVolatge + 857.39*compensationVolatge)*0.5; //convert voltage value to tds value

how these constants can be used for the calculation?

hi, is the 0 - 1000 ppm range based on the sensor probe or the UART board? Can I replace it with a probe rated at 3000 ppm and tweak the code to get the result i need?