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TDS Module ESK-TDS-66F3185

US$ 22.70
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TDS (Total Dissolved Solids) is a measure of the combined total of organic and inorganic substances contained in water. It can be a general indicator of water quality. The unit of TDS measurement is ppm or milligrams per liter (mg/L). The larger the TDS value, the more dissolved substances in water.

In many consumer products, the TDS value is calculated by measuring the conductivity of water (in uS/cm), which is roughly 1 ppm TDS = 2uS/cm. Using parallel cylindrical electrodes with fixed distance as the measuring probe, the probe is placed in water and a voltage is applied between the two electrodes to measure the conductivity.

Factors affecting the accuracy of TDS measurement include water temperature, flow rate, etc. In general, the standard measurement temperature is 25°C. For each 1°C increment, the TDS value increases by about 2%. When measuring TDS, the water temperature is usually measured together for temperature compensation.

The Holtek TDS Workshop integrates the rich functions of TDS measurement, temperature measurement, button input, display, communication etc. You can complete the configurations and generate MCU codes in several steps. The TDS platform also has a calibration monitoring window to calibrate the device and monitor the measured TDS value continuously. The measurement records can be exported to an excel file.

Holtek provides six modules and the development board, ESK-TDS-100, that can work with the TDS platform. Each module includes a TDS sensor probe (TDS-37). The ESK-TDS-66F3185 is a measurement module based on the MCU HT66F3185.

The TDS modules support both single-channel and dual-channel measurement of TDS and temperature. But they do not support the LCD, LED and button functions of the TDS Display Board (ESK-TDS-100). Either the UART or I2C can be used for communication.

Product information

Assembled dimension: 80 x 37 x 85 mm
Net weight: 8.5g (PCB)
Product includes:
1. TDS module ESK-TDS-66F3185 x 1
2. TDS sensor probe (TDS-37) x 1

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1-9 - US$ 22.70
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  1. Input voltage: 3.3V – 5V
  2. TDS measuring range: 0 – 2000 ppm
  3. TDS accuracy: ±5% F.S.
  4. Temperature measuring range: 0 - 99 °C; (0 - 60°C if you use TDS-37 probe, according to the TDS-37 specification)
  5. Temperature accuracy: ±1%
  6. TDS sensor probe connector: XH2.5-2P (2.5mm)
  1. You can download the TDS Workshop from Holtek's website, and then open the workshop to create a project.
  2. In the workshop, you can set parameters, and generate the program code from the workshop.
  3. Insert the module into the development board, TDS-100, and connect to an e-Link for programming.
  4. Note:
    You may need to open the HT-IDE3000 to generate a mtp file, and import the file to HOPE3000 for e-Link for programming.
  5. You need to prepare a cup of water, a bottle of TDS calibration solution, and a thermometer for calibration and enter "Calibration Monitoring" in the workshop.
  6. You need to use the TDS calibration solution and thermometer to measure the current values and set the values in the workshop to calibrate the conductivity and temperature of water.
  7. If the calibration has been completed, you can start monitoring the conductivity and temperature of water. The TDS value (in ppm) will be displayed on the LCD of the development board.
  1. Platform: TDS Workshop, including user's guide, software, etc.
  2. MCU: HT66F3185, A/D Flash MCU with EEPROM, including datasheet, package information, etc.
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