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創客萊吧 MakerLab

Arduino 電容式土壤濕度傳感器
$ 285.0 元

液位傳感器 with Plastic Casing
售價 : NT$ 2,999.0 元
製造商 :Adafurit
適用運送方式 : 7-11取貨付款,7-11純取貨,郵寄(單一運費),貨運,宅配,貨到付款,7
出貨時程: 【現貨+預購】如遇缺貨,預購交期為4~10個工作天(不含例假日)   

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產品上架時間 2015 十月 06 週二.



This eTape Liquid Level Sensor is a solid-state sensor with a resistive output that varies with the level of the fluid. It does away with clunky mechanical floats, and easily interfaces with electronic control systems. What separates this from our other eTape Liquid Sensor is the hard plastic jacket that makes it less susceptible to damage.

The eTape sensor's envelope is compressed by the hydrostatic pressure of the fluid in which it is immersed. This results in a change in resistance that corresponds to the distance from the top of the sensor to the surface of the fluid. The sensor's resistive output is inversely proportional to the height of the liquid: the lower the liquid level, the higher the output resistance; the higher the liquid level, the lower the output resistance.

This is a very unique sensor, we haven't seen anything else that is affordable and accurate for measuring liquid level. This particular sensor is the 12" model. It comes with a 3-pin JST connector.

Since the sensor is resistive, it is easy to read it using a microcontroller/Arduino ADC pin. Check the tutorials tab for a quick-start pointer.

Note: This product only comes with the plastic enclosed eTape Liquid Level Sensor.  In our demo, we set it up with an Adafruit Metro, a TB6612 Stepper Motor Driver Breakout Board, and an Automotive Gauge Stepper Motor.




    • 305mm x 29mm x 13mm / 12" x 1.14" x 0.51"
    • Weight: 56g
    • Sensor Output: 400-2000Ω ±20%
    • Ref. Resistance: 2000Ω ±20%
    • Actuation Depth: Nominal 25.4mm / 1"
    • Resistance Gradient: 60Ω/cm / 150Ω /inch
    • Power Rating: 0.5 Watts
    • Temperature Range: 15°F - 150°F / -9°C - 65°C
    • Standard eTape Datasheet

We don't have a detailed tutorial for this sensor but it acts very much like a thermistor so we suggest checking out that tutorial for background, and then following these instructions:

Connect pin #2 of the sensor to ground, then pin #3 to a 560 ohm resistor. The other side of the 560 ohm resistor to VCC (3.3V or 5V for example) to create a resistor divider. The ADC pin connects to the point between the resistor and sensor.


// the value of the 'other' resistor
#define SERIESRESISTOR 560   

// What pin to connect the sensor to
#define SENSORPIN A0

void setup(void) {

void loop(void) {
float reading;

reading = analogRead(SENSORPIN);

Serial.print("Analog reading ");

// convert the value to resistance
reading = (1023 / reading)  - 1;
reading = SERIESRESISTOR / reading;
Serial.print("Sensor resistance ");



Then look in the App Note for the conversion between resistance and liquid level.