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this module will send the card number to arduino by UART
10 � touch sensors
Do not touch the pins and pads of the components on the board
it is easy to make and surroundings have sealed the keyboard
Gravity Arduino Analog Turbidity Sensor micro usb programming this module will send theThe gravity arduino turbidity sensor detects water quality by measuring the levels of turbidity. It uses light to detect suspended particles in water by measuring the light transmittance and scattering rate, which changes with the amount of total suspended solids (TSS) in water. As the TTS increases, the liquid turbidity level increases. Turbidity sensors are used to measure water quality in rivers and streams, wastewater and effluent measurements,
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