|Hard Drive Interface||IDE|
|Operating System||Chrome OS|
|Has Auto Focus||No|
|Supports Bluetooth Technology||No|
|Has Programmable Buttons||No|
|Product Dimensions||5 x 3 x 8 cm; 100 Grams|
|Item Weight||100 g|
|Item Model Number||KS0429|
|Date First Available||8 April 2020|
KEYESTUDIO Analog TDS Sensor Water Conductivity Sensor for Arduino UNO R3, MEGA 2560, Liquid Detection Water Quality Monitoring Module DIY TDS Online Monitor with 2 Probes
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- TDS probe sensor for arduino is used to measure TDS value of the water. The TDS value can be used as one of the basis for reflecting the cleanliness of water.
- TDS (Total Dissolved Solids): indicates how many milligrams of soluble solids dissolved in one liter of water. The higher the TDS value, the more soluble solids dissolved in water, and the less clean the water is.
- TDS Meter Probe is plug and play and easy to use. Also, the wide supply voltage of 3.3~5.5V and the analog signal output of 0~2.3V. Comes with XH2.54-2P/3P connector wires
- Tutorails Downlode→https://fs.keyestudio.com/KS0429 . Its Electrode can measure conductive materials, such as suspended solids, heavy metals and conductive ions in water. Also, it can be used for water quality testing in the field of domestic water and hydroponics
- With this sensor, you can easily DIY a TDS detector, and easily check the cleanliness of the water to make your water quality better. How to use: Search for "keyestudio wiki KS0429" in Google Chrome to get the wiki online tutorial for this product.
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KEYESTUDIO TDS sensor kit is compatible with Arduino controllers, plug and play, easy to use, Analog TDS Sensor for Domestic Water and Hydroponics Water Quality Monitoring
TDS Meter sensor:
Input Voltage: DC 3.3 ~ 5.5V
Output Voltage: 0 ~ 2.3V
Working Current: 3 ~ 6mA
TDS Measurement Range: 0 ~ 1000ppm
TDS Measurement Accuracy: ± 10% F.S. (25 ℃)
Module Interface: XH2.54-3P
Electrode Interface: XH2.54-2P
Waterproof TDS Probe:
Number of Needle: 2
Total Length: 60cm
Connection Interface: XH2.54-2P
TDS Meter V1.0 sensor for Arduino x1
Waterproof TDS Probe x1
XH2.54-3Pin Jumper Wire x1
Review this product
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I originally connected these sensors to the analog-to-digital (ADC) on an ESP32 microcontroller, testing it in both the Arduino IDE and ESPHome. The voltage was all over the place and produced garage readings. I ended up using instead an ADS1115 (16-Bit, 4 channel ADC) and connected it to the ESP32 via the I2C interface. This eliminated most of the problems of repeatability and I was finally getting consistent readings. HOWEVER, there was still a lot of variation in readings from one probe to the next. I had to individually calibrate each sensor to correct this.
There's sample Arduino for this product online which contains a calibration formula--ignore it, it's completely useless. Instead, I made eight different concentrations of a calibration solution by mixing lab-grade deionized water and table salt. I then plotted the observed voltage at each concentration and came up a linear calibration curve using the least squares means method. (This sounds complex but is rather easy to setup using the "calibrate_linear" filter in ESPHome). I did this for each of the two senors, making a unique calibration profile for each.
Everything now works and is reasonably accurate for my needs. I am somewhat concerned about long-term drift but will update this review with my experiences over time.