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FIT0850, NPN to PNP Signal Converter / Adapter Module
US$17.50
The FIT0850 is a signal converter designed to take NPN signals to PNP. It's equipped with surge absorption and over-current protection to further protect your device.
Delivery within 2-3 weeks
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AM-109, 30A Current Range Hall Current Sensor Module 5V
US$9.76

This device is a 30 ampere 5 volt range current Hall Sensor module.

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DFR0853, 8-Channel Isolated Analog Data Acquisition Module
US$118.25
The DFR0853 is an 8-channel single-end 12-bit analog data acquisition module with an accuracy of up to ±1‰, It can collect multiple channels simultaneously, and can also collect voltage and current at the same time.
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CONDUCTIVITY SENSOR
US$34.44

CNTD01 CONDUCTIVITY SENSOR

This handheld device provides a qualitative visual indicator of the conductivity of different solutions, acids or salts.

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Adafruit INA260 High or Low Side Voltage, Current, Power Sensor
US$16.15
This breakout board may well be the last current sensing solution you ever need to buy. Not only can it do the work of two multimeters, but it can do it with amazing precision and flexibility. With it you can measure high or low side DC current, the bus voltage, and have it automatically calculate the power. It can do so over impressive voltage, current, and temperature ranges with better than 1% accuracy, all while delivering the data in an easy to use format over I2C.
Delivery within 2-3 weeks
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MOD-MAX471-4 MAX471 3A Current and Voltage Range Sensor Module
US$7.96
The MAX471 measures both current and voltage, thus making it ideal for a quick power measurement.
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AM-113 Current Sensor Breakout Board for Arduino
US$21.95
Current Sensor Breakout Board for Arduino
This is a breakout board that can read current from a wire without having to wire it directly to the controller board. Simply pass the wire through the white hoop which is known as the WCS1700, to start reading the current. The output value is adjust by the LM393 which is sent to the microcontroller via Digital on Dout or analog via Aout. This board requires 5v to power the board and can read up to 3Amps.
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MOD-HMCT103C HMCT103C 5A/5MA Micro Current Transformer
US$3.07
This is a precision AC current transformer. It is widely used in applications such as sensing overload current, ground fault detection, metering, analog to digital circuits.
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MOD-MAX471-GY 3A Rated Current Sensor for Arduino Microcontrollers
US$3.84
Do you have a project that requires current sensing, running off a battery and want to know how much mAh battery pack you want to order? This product will essentially help inform you of your current consumption to whatever device you interface with this board with. This product uses a MAX471 Op-Amp to detect current, the MAX471 has an internal 35mΩ current-sense resistor and measures battery currents up to ±3A. This device typically operates from 3V to 36V, and draws less than 100µA while idle. The module is also supplied with 2 screw terminal and 0.1" pitch headers (requires soldering).
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DFR0504 Gravity: Analog Signal Isolator
US$34.75
The Analog Signal Isolator can isolate analog signal and provide isolated power to sensors. It can effectively prevent sensor signal interference and apply to multi-parameter water quality monitoring sensors. Because usually sensors will be interfered by the other sensors during the measurement, especially those sensors in water quality monitoring system. For example, pH sensor (pH meter) will be affected by the electrical conductivity sensor (EC meter). The common solution is to isolate the power supply. Once you put them into the same container and share the same power supply, their value won’t be interfered by each other.This analog signal isolator is designed for this situation, it will isolate the analog signal and provide isolated power to the sensors. It has an on-board 5V isolated power IC, and compatible with Gravity-3Pin interface, plug and play, no need for soldering. The transform rate is 1:1, which means analog values in two sides should remain the same.
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AM-111 Current Sensor Module using the Hall Effect 20 Amp
US$7.32
This component allows users to measure current of their circuit and will send data to the Arduino microcontroller to spit out an analog output value. This device has only three wires required to successfully interface with Arduino. Connect VCC to 5v, gnd to ground and Out to any analog pin on the Arduino. The conversion of the pin value is per 185mv/A. We have attached an Arduino code example to get it working straight out of the package. Connect the return ground line of the load to the terminal block and the other input of the block to your power source like an ammeter to start reading current. This unit is designed to read a max of 20 amps!
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MOD-MAX471 MAX471 3A Current Range Sensor Module
US$4.93
The following module allows you to measure the current of a circuit by outputting an analog value you can then send to a microcontroller board (Arduino). Connect your inputs appropriately and for every amp measured, the board will output a volt (ratio is 1V/A, max of 3 A). To get the module working, you must first connect the RS+ pin to your positive supply line, your RS- to your loads positive end and GND to a common ground plain (as if you were connecting an ammeter). Now for the output terminals, simply connect the pin labeled OUT to any analog pin on your microcontroller and the GND pin to your microcontrollers ground.
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PZEM-004T Multifunction Power Monitoring
US$26.34
This tiny PZEM-004T circuit is great for measuring AC (RMS) voltage, current and power (single phase). The unit easily interfaces with Arduino and other hardware using the code library provided below. Simply power the board with a power supply (or you can use the AC source you are measuring) and connect the circular sensor to the board. Run the wire through the circular sensor and you`re ready to start measuring the voltage, current and power. The circuit also comes with a TTL to USB adapter wire for easy connection to a computer or microcontroller.
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BB-INA219 I2C Interface – DC Current Sensor (INA219)
US$10.70
This breakout board will solve all your power-monitoring problems. Instead of struggling with two multimeters, you can just use the handy INA219B chip on this breakout to both measure both the high side voltage and DC current draw over I2C with 1% precision. With the internal 12 bit ADC (Analog-Digital Converter), the resolution at ±3.2A range is 0.8mA. With the internal gain set at the minimum of div8, the max current is ±400mA and the resolution is 0.1mA.
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SCT-013-030 Non-invasive AC Current Sensor (30A max)
US$15.33
The split core type such as this CT, is particularly suitable for DIY use it can be clipped straight on to either the live or neutral wire coming into the building without having to do any high voltage electrical work.
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SEN0223 Gravity: Conductivity Sensor Switch - DFRobot
US$6.23
The Gravity Conductivity Sensor Switch module can be used to detect if an object has electrical conductivity. Its maximum detection value is 10MΩ. It can detect not only coins, wires, metal and other good conductors, but also the human body, fruit, plants and other conductors. By touching the positive and negative terminals of the conductive switch, you can change the output state of the module. Use this to make interactive applications such as fruit pianos, musical wind chimes or interactive video game controllers so Super Mario using a bunch of bananas.
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