DFRobot Gravity 7/24 Industrial Analog pH Meter Kit for Arduino & Raspberry Pi Project The Gravity: 7/24 Industrial Analog pH Meter Kit (SEN0169-V2) is a professional-grade water quality monitor designed for continuous, real-time pH measurement in demanding environments. This upgraded version significantly improves precision and user experience compared to its predecessor. The kit includes an industrial-grade pH probe that supports 24/7 monitoring with a lifespan exceeding 4380 hours, ensuring consistent performance even in harsh conditions. The onboard voltage regulator chip supports a wide voltage supply range of 3.3V to 5.5V, making this industrial pH sensor compatible with both 5V and 3.3V main control boards such as Arduino, Raspberry Pi, and LattePanda. Its hardware-filtered output signal delivers low jitter for stable readings. What sets this Arduino pH meter apart is its exceptional accuracy of ±0.1 pH at 25°C and user-friendly calibration process. The software library adopts a two-point calibration method that can automatically identify standard buffer solutions (4.0 and 7.0), making the setup process simple and convenient. The industrial pH combination electrode features a sensitive glass membrane with low impedance, providing fast response times and good thermal stability. With its linear output voltage across the 0 to 14 pH range and excellent anti-pollution performance, this continuous pH measurement system is ideal for long-term online detection in applications such as aquaponics, aquaculture, chemical monitoring, and environmental water testing. Features Supports 24/7 continuous monitoring with lifespan exceeding 4380 hours. High measurement accuracy of ±0.1 pH at 25°C for precise readings. Two-point calibration using standard buffer solutions (4.0 and 7.0). Wide operating voltage range of 3.3V to 5.5V for versatile compatibility. BNC connector and Gravity interface for easy plug-and-play setup. Industrial pH probe with sensitive glass membrane and low impedance. Measurement range of 0 to 14 pH for comprehensive testing capabilities. DFRobot Gravity 7/24 Industrial Analog pH Meter with Arduino Connection Diagram Important Notes: Keep the BNC connector and signal conversion board dry and clean. Moisture can lower the input impedance, causing inaccurate readings. If damp, dry them before use. Do not place the signal conversion board on wet or conductive surfaces. This may affect accuracy. Use nylon standoffs to mount it, maintaining a gap between the board and the surface. The glass tip of the pH probe is delicate. Avoid contact with hard surfaces. Scratches or cracks can damage the probe. After use, disconnect the pH probe from the signal board. Do not leave it connected when the board is powered off for long periods. The probe cap contains protective liquid (3.3mol/L KCL). Some leakage and white crystal formation around the cap is normal. As long as there’s still liquid inside, the probe will remain accurate. You can return the crystals to the cap if needed.

Gravity: Analog AC Current Sensor (20A) Gravity: Analog AC Current Sensor (20A) is the perfect solution for hassle-free AC current measurement. No more cutting wires or complicated circuits. Designed for non-contact measurement, this sensor offers multiple ranges, making it versatile for various scenarios. Whether monitoring AC motors, lighting, or electrical equipment, this sensor ensures high safety and easy installation. Compatible with 3V3/5V micro-controllers, it provides accurate readings without direct contact. The wide temperature range makes it suitable for diverse conditions. Enhance your projects with the reliability of Gravity: Analog AC Current Sensor. Features: Non-contact measurement, high safety Multiple ranges for various measurement scenarios Compatible with 3V3/5V micro-controller Applications: AC motor automatic monitoring Lighting and electrical equipment measurement

15cm Camera Cable for Raspberry Pi The camera cable is compatible with NoIR camera for Raspberry Pi. The 15cm Camera Cable can be used for Raspberry Pi 3 and Raspberry Pi 2. Ribbon Cable with FFC contacts (Opposite-sided).

Analog Capacitive Soil Moisture Sensor V2.0 Analog Capacitive Soil Moisture Sensor (Anti-Corrosion) is a soil moisture sensor based on capacitance variation. Compared with the resistive sensor, the capacitive sensor does not require direct contact with the metal electrode, which can greatly reduce the electrode corrosion, it is considered to be anti-corrosion. It is important to note that this sensor can only qualitatively test soil moisture and cannot measure it quantitatively. As soil moisture increases, yield values ??decrease; conversely, when the humidity decreases, the output value becomes higher. This Capacitive Soil Moisture Sensor V2.0 measures soil moisture levels by capacitive sensing rather than resistive sensing like other sensors on the market. It is made of corrosion-resistant material which gives it excellent service life. Insert it into the soil around your plants and impress your friends with real-time soil moisture data. It is perfect for low-voltage MCUs, both 3.3V, and 5V. For compatibility with a Raspberry Pi, it will need an ADC converter. This soil moisture sensor is compatible with our 3-pin “Gravity” interface, which can be directly connected to the Gravity I/O expansion shield. Also, read our blog on Smart Plant Monitoring System detailing the plant moisture monitoring system, discussing their purpose, components, working, advantages over traditional systems, and other important aspects of this emerging technology. Applications: Garden plants Moisture detection Intelligent agriculture

1/2 Inch Water Flow Sensor SEN-HZ21WA The SEN-HZ21WA water flow sensor is a device that is used to measure the flow rate of water. It consists of a turbine-type rotor that is placed in the water stream, and as the water flows past the rotor, it causes the rotor to spin. The sensor measures the speed of the rotor and converts it to a flow rate. The flow sensor has a digital output, which means that it provides a digital signal that can be read by a microcontroller or other host device. The sensor is commonly used in applications such as irrigation systems, water treatment plants, and industrial process control. It is often preferred over other types of flow sensors because it is easy to install and has a low cost. The SEN-HZ21WA sensor is designed to be installed in a pipe with a diameter of 1/2 inch (12.7mm). A pinwheel inside the sensor moves as the liquid flows through the sensor. A hall effect sensor within the sensor senses the rotation of the pinwheel and outputs a digital pulse for every rotation. By counting the pulses from the sensor, you can easily sense liquid flow through the sensor. This allows easy interface to microcontroller, Arduino , Raspberry Pi , etc. Applications: Water testing Water cooling systems Measure liquid flow

3/4 INCH BRASS WATER FLOW SENSOR SEN-HZ43WB The SEN-HZ43WB water flow sensor is a device that is used to measure the flow rate of water. It consists of a turbine-type rotor that is placed in the water stream, and as the water flows past the rotor, it causes the rotor to spin. The sensor measures the speed of the rotor and converts it to a flow rate. The sensor has a digital output, which means that it provides a digital signal that can be read by a microcontroller or other host device. Now easily measure water (liquid) flow in your application using this 3/4" Brass water flow sensor. This is a good-quality flow sensor with a brass body and can be used for industrial and commercial applications. These three forth inch water flow sensor is used extensively in various types of vending machines. This water flow sensor is connected in line with the liquid whose flow rate has to be measured. There is a simple rotating wheel with a magnet and when the liquid flows the wheel is rotated and a hall effect sensor measures how many times the wheel is rotated and accordingly gives pulses. By counting the number of pulses you can easily calculate the flow rate as well as the amount of liquid dispensed. Note: When magnetic material is close to the sensor, its characteristics may vary. In order to avoid particle debris, the sensor must be installed after a filter. The flow sensor installation has to avoid strong vibration and shaking of the environment, so as not to affect the sensor's measurement accuracy. APPLICATIONS: Thermostatic water heater Water purifier Water dispenser Smart card equipment Coffee machine

Analog pH Sensor Electrode with Amplifier Circuit The Analog pH Sensor Kit is the ultimate solution for precise pH measurement in soil and water testing applications. With a measurement range of 0 to 14pH, it provides accurate results for a wide range of pH levels. This kit includes a pH probe and pH Sensor board, making it easy to condition the pH probe's output signal (ranging from 0.5V to 3V). Whether you're a beginner or an experienced user, you'll find this kit user-friendly and efficient. These sensor applications are diverse, from agriculture to aquaculture and water quality testing. The sensor ensures stable readings with quick response times, ensuring you get reliable data for your projects. Compatible with popular development platforms like Arduino and Raspberry Pi , this kit offers versatility for various applications. Few guidelines for using the sensor properly: Make sure the sensor is properly calibrated. The probe is dipped in deionized distilled water after each reading for at least a minute. The sensor is given at least a few minutes to settle down in its reading after dipping it in a solution. Here is the link to the pH Sensor Blog for a detailed explanation. Applications: Determine the PH level in the water Soil measurements in agriculture Aquaculture Pinout Of PH Probe Sensor: TO – Temperature output DO – 3.3V Output (from ph limit pot) PO – PH analog output ==> Arduino A0 Gnd – Gnd for PH probe (can come from Arduino GND pin) ==> Arduino GND Gnd – Gnd for the board (can also come from Arduino GND pin) ==> Arduino GND VCC – 5V DC (can come from Arduino 5V pin) ==> Arduino 5V pin POT 1 – Analog reading offset (Nearest to BNC connector) POT 2 – PH limit setting

1.5 Inch Water Flow Sensor YF - DN40 The YF-DN40 water flow sensor is a device that is used to measure the flow rate of water. It consists of a turbine-type rotor that is placed in the water stream, and as the water flows past the rotor, it causes the rotor to spin. The flow sensor measures the speed of the rotor and converts it to a flow rate. The sensor has a digital output, which means that it provides a digital signal that can be read by a microcontroller or other host device. The sensor is commonly used in applications such as irrigation systems, water treatment plants, and industrial process control. It is often preferred over other types of flow sensors because it is easy to install and has a low cost. The YF-DN40 sensor is designed to be installed in a pipe with a diameter of 40mm or 1.57 inches.

KY-036 Metal Touch Sensor The KY-036 Touch Sensor Module utilizes a floating lead on a Darlington transistor to detect a touch. There are 2 LEDs on-board. A red LED lights when power is applied. A green or red LED lights when a touch is detected. It's a simple module that can be easily integrated into a circuit, it can be connected to an MCU (microcontroller unit) using just three pins: VCC, GND and Signal. The signal pin goes high when the sensor is touched and goes low when the touch is removed. It can be used in a variety of applications where touch sensing is required such as buttons, touchscreens, and other human-machine interfaces.

MPR121 - 12 Channel Capacitive Touch Sensor Controller Module - I2C Interface The MPR121 12-Channel Capacitive Touch Sensor Controller Module is a capacitive touch sensor controller driven by an I2C interface. The chip can control up to twelve individual electrodes, as well as a simulated thirteenth electrode. This is a breakout board for NXP/ Freescale’s MPR121QR2. The MPR121 also features eight LED driving pins. When these pins are not configured as electrodes, they may be used to drive LEDs. There a four jumpers on the bottom of the board, all of which are set (closed) by default. An address jumper ties the ADD pin to ground, meaning the default I2C address of the chip will be 0x5A. If you need to change the address of the chip (by shorting ADD to a different pin), make sure you open the jumper first. Jumpers also connect SDA, SCL and the interrupt pin to 10k pull-up resistors. If you don’t require the pull-up resistors you can open the jumpers by cutting the trace connecting them. There is no regulation on the board, so the voltage supplied should be between 2.5 and 3.6VDC. The VREG pin is connected through a 0.1uF capacitor to ground, which means, unless you modify the board, you can’t operate the MPR121 in low-supply voltage mode (1.71-2.75VDC). Pin Diagram of MPR121-12 Channel Touch Sensor Module: