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TDS meter water quality sensor with an amplifier board
The TDS Meter Water Quality Sensor measures total dissolved solids in water and provides an analog output via an amplifier board for embedded and IoT applications.
The TDS Meter Water Quality Sensor with Amplifier Board is a practical sensor designed to measure Total Dissolved Solids (TDS) in water, indicating the concentration of dissolved salts, minerals, and other substances. TDS is an important parameter for evaluating water purity and quality.
This sensor consists of a waterproof probe and an amplifier/signal conditioning board that converts the probe signal into a stable analog voltage output, making it easy to interface with microcontrollers such as Arduino, ESP32, STM32, and Raspberry Pi. The amplifier board enhances accuracy and simplifies integration into real-time monitoring systems.
The TDS sensor module is widely used in drinking water testing, aquaculture, hydroponics, water purification systems, smart irrigation, environmental monitoring, and educational projects, providing a reliable and cost-effective solution for water quality measurement.

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Text to Speech TTL Module (Serial to Speech)
-  Single row 0.1″ header for easy connection to a host system
- Power requirements: +5 VDC
- 30 mA idle
- 46-220 mA active (depending on speech parameters and output load)
- Â Communication: Asynchronous 9600 bps serial (8N1)
- Dimensions: 1.25″x1.5″x0.37″
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Text support rate is better
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 Interface operation is simpler
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5V single power supply.
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Output directly connected to the speaker, can drive 4 ohms 3W / 8 ohm 2W speakers
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Busy status output, can be connected to the microcontroller IO or indicator light, no need to be left floating.
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 Voice effect optimization
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 Module miniaturization and easy integration
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Dimension: 33*27.5mm
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With mounting holes

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