• Wide voltage range from 3.3V to 5V
• Standard assembling structure (two 3mm diameter holes with multiple of 5mm as distance from center)
• Easily recognitive interfaces of sensors (“A” for analog and “D” for digital)
• Icons to simplely illustrate sensor function 
• High quality connector
• Immersion gold surface

• Supply Voltage: 3.3V to 5V
• Indicator LED on board
• Easy to ‘plug and play’
• Large button keypad and high-quality first-class hat
• Able to achieve very interesting and an interactive work
• Interface: Digital
• Size:22x30mm(0.87″x1.18″)

• Wiki Doc     
• Schematic

• Digital Push Button x1
• Digital cable x1

• Tracking of robots with IR transmitters for navigation.
• Light barriers for determine the direction where the object is going to.
• Flame sensor, tracking of heat sources.

• Operating voltage: 3.3-5v
• Interface: I2C​
• Detecting distance: 0~3m
• Horizontal detecting angle: 33 degrees
• Vertical detecting angel: 23 degrees
• Dimensions: 32mm x 16mm(1.26×0.63″)
• Resolution is 128×96 pixel, with hardware image processing, which can track four objects (IR emitting or reflecting objects)

• Wiki (Positioning ir camera)
• Datasheet

• Positioning IR Camera  x1

In the ever-increasing need and awareness for health and safety, water has become a focus point for proper disinfection treatment as aftereffects of industrialization can become a danger for contamination of water via direct contact. Water is a critical control point of contact where proper treatment can greatly reduce these microbes, thereby reducing the chances of illness and pollution.
 

While traditional ORP meters are hard to get or use, this Analog ORP Meter is a highly compact ORP monitoring system that fits into your Arduino. This design configuration allows the user to accurately monitor ORP without having to add any additional circuitry or components to your design. Communication with the Analog ORP Meter is done using only simple wiring and programming. You may also check Liquid Sensor Selection Guide to get better familiar with our liquid sensor series.

ORP (Oxidation-Reduction Potential) is a measure of the ability of oxidation and reduction of the aqueous solution, characterization of oxidizing or reducing the relative degree. Unlike a pH measurement that follows a logarithmic curve and therefore requires more calibration adjustments, ORP follows a linear relationship and does not need instrument adjustment as much as it needs electrode maintenance. ORP has proven to be a reliable method of measuring water quality and provides the operator with a single value of measurement regardless of which product, commodity, operation, treatment, or sanitizer is used, and regardless of varying field conditions or methods by which chemical is applied.
 

Attention：

The bottle cap of the probe contains protective liquid (3.3mol/L KCL). Even if the bottle cap is screwed tightly, some protective liquid may still leak around the bottle cap, forming white crystals. But as long as there is still protective liquid in the bottle cap, it will not affect the life and accuracy of the probe. So please use it with confidence. It is recommended that the white crystals be poured back into the protective liquid in the bottle cap.

• Water Quality Testing
• Aquaculture
• Marine Science
• Hydroponic Gardening
• General Chemistry

• Module Power:+5.00V
• Module Size: 40mmX27mm(1.57″x1.06″)
• Measuring Range:-2000mV—2000mV
• Suitable Temperature:5-70℃
• Accuracy:±10mv (25 ℃)
• Response Time:≤20sec
• ORP Probe with BNC Connector
• PH2.0 Interface(3 foot patch)
• Zero calibration button
• Power Indicator LED

Project 1. Build KnowFlow: automatic water monitor

KnowFlow is the name of this water quality monitoring device, based on Arduino Uno. It can automatically monitor 5 parameters of water: pH, Temperature, Dissolved Oxygen, Electronic Conductivity, ORP.

• Central Control Unit: Arduino Uno (DFRobot Bluno in this case) and Expansion Shield (DFRobot Expansion Shield V7.1 in this case)
• Water Sensors: pH (pH probe and pH circuit board); EC (EC probe and EC circuit board); ORP (ORP probe and ORP circuit board); Temperature (temperature probe and temperature circuit board); Dissolved Oxygen (DO probe, BNC and circuit board); real time clock circuit board
• Data Storage: Micro-SD module, Micro SD card
• Fit and fix: mounting plate, water proof box( 200mm_150mm_75mm), water proof joint
• Other parts: Cables (Wires), bread board, bolts and nuts, screws, battery, double-sided adhesive, write on tape, small wrench, spiral cable wrap

Project 2. ORP Water Quality Detector Creating Charts in Google Sheets

Introduction: Track the water quality of different sources by location via SIM808 to avert the detrimental effects of water pollution on the immune system.

• Product WiKi
• Schematic
• ORP Meter PCB Layout
• Arduino sample code
• ORP Composite Electrode Manual

• ORP probe (BNC connector) x1
• ORP probe circuit board x1
• Analog cable x1

• Two selectable differential input channels
• On-chip active low noise PGA with selectable gain of 32,64 and 128
• On-chip power supply regulator for load-cell and ADC analog power supply
• On-chip oscillator requiring no external component with optional external crystal
• On-chip power-on-rest
• Simple digital control and serial interface: pin-driven controls, no programming needed
• Selectable 10SPS or 80SPS output data rate
• Simultaneous 50 and 60Hz supply rejection
• Supply Voltage: 2.6V~5.5V
• Current: <1.6mA
• Working temperature: -40~85°C
• 16 pin SOP-16 package

• Range: 1kg
• Excitation voltage: 5-15 V
• Output sensitivity: 1.0±0.15mV/V
• Synthetical error: 1 per thousand cent of full scale
• Zero shift: 0.05/0.03 （30min）%F.S
• Zero temperature shift: 0.05/0.03 %F.S/10°C
• Zero output: ±0.1mV/V 
• Input impedance: 1055±15 Ω
• Output impedance: 1000±5 Ω
• Overload capability: 200 %F.S 
• Output: Analog output
• Size: 33mm*38mm

• WIKI (Weight Sensor Module SKU:SEN0160)                                              
• library                                           
• schematic                               
• datasheet
• 3D printed module design files

• Weight sensor module          x1
• Weight sensor                 x1
• Sensor cable                  x2

• Power supply: 5V
• Control Outout：100mA when supply 5V
• Circuit consume： <25mA
• Response time: <2ms
• Direction: ≤15°
• Range: 3~40cm adjustable for opacity and transparent objects
• Shell marterial:plastic 
• A low voltage output will be given when an object is in its detecting scope
• When connecting to MCU pins, you need to add a 1~10K Ohm resistor for pull-up
• Sharp： 30mm(length) x 20mm(wide) x 13mm(thickness) with a 45cm lead wire

• Wiki (Adjustable Infrared Sensor Switch SKU:SEN0164)

• Adjustable Infrared Sensor x1

This is the first CO2 sensor in the Arduino market.  The output voltage of the module falls as the
concentration of the CO2 increases. The potentiometer onboard is designed to set the threshold of voltage. As long as the CO2 concentration is high enough (the voltage is lower than the threshold),  a digital signal (ON/OFF)
will be released.

• It has MG-811 sensor module which is highly sensitive to CO2 and less sensitive to alcohol and CO, low humidity & temperature dependency. 
• Onboard heating circuit brings the best temperature for the sensor
  to function. Internal power boosting to 6V for heating sensor best performance. 
• This sensor has an onboard conditioning circuit for amplifying output signal. 

To ease the difficulty of using this CO2 sensor,  a Gravity Interface is
adapted to allow plug&play.  The Arduino IO expansion shield is the best match for this CO2 sensor connecting to
your Arduino microcontroller. 

This is an electrochemical Arduino-based CO2 sensor, it is suitable for qualitative analysis. DFRobot also developed other Infrared CO2 sensors, which are suitable for quantitative analysis.

1. Gravity: Analog Infrared CO2 Sensor For Arduino (0~5000 ppm), high precision, apply to Arduino and other microcontrollers with ADC function.

2. Gravity: UART Infrared CO2 Sensor (0-50000ppm), wide range, apply to Arduino,
Raspberry Pi and other microcontrollers with UART
function.

Gravity CO2 Sensor Selection Guide
Product Name	Gravity: Analog Electrochemistry CO2 Sensor	Gravity: Analog IR CO2 Sensor	Gravity: UART IR CO2 Sensor	Gravity: I2C SCD41 Infrared CO2 Sensor (400 – 5000 ppm)
SKU	SEN0159	SEN0219	SEN0220	SEN0536
Operation Voltage	3.7～5V	4.5～5.5V	4.5～5.5V	3.3V-5V
Output	Gravity: Analog (Analog2.7～4.1V) + 3P Header Digital Output(Alarm):0～VCC Level	Gravity: Analog (Analog Output 0.4～2V)	Gravity: UART (0～3.3V Level)	Gravity: I2C
Measurement Principle	Electrochemistry （Solid electrolyte battery principle）	NDIR(non-dispersive infrared)	NDIR(non-dispersive infrared)	photoacoustic NDIR
Measurement Range	0～10000 ppm	400～5000 ppm	0～50000 ppm	400～5000ppm
Accuracy	±100ppm@400ppm	±(100ppm + 6% readings)	±(100ppm + 6% readings)	±(40 ppm + 5% MV)
Response  Time	<20s	<90s	<30s	60S
Average  Power	<1W	<430mW@5V	<430mW@5V	<30mW@5V
Operation Temperature	-20℃～50℃	0℃～50℃	0℃～50℃	-10℃～60℃
Operation Humidity	0～95% RH (No condensation)	0～95% RH (No condensation)	0～95% RH (No condensation)	0～95% RH (No condensation)
Lifespan	>1 year	>5 years	>5 years	>10 years
Dimension (PCB)	32*42 mm	37*69 mm	21*27.1 mm	32*27*8mm
Features	1. Large Range 2. Adjustable Alarm Threshold 3. Fast Response 4. Analog Output	1. High Accuracy 2. Long Lifespan 3. Auto Temperature Compensation 4. Water Vapor Interference Resistance 5. Ananglog Output	1. High Accuracy 2. Large Range 3. Long Lifespan 4. Auto Temperature Compensation 5. Water Vapor Interference Resistance 6.3.3V UART Output	1.CO2, temperature, and humidity, three in one 2. Small size of 32*27*8mm 3. Low power, average current＜4mA

• Air Quality Control
• Ferment Process Control
• Room Temperature CO2 concentration Detection

• Operating Voltage:5V
• Interface: Gravity Analog
• One digital output
• High-quality connector
• Immersion gold surface
• Onboard heating circuit
• Size:32x42mm (1.26×1.65″)

• Product Wiki                  
• Schematic                      
• Layout                  
• MG811 datasheet         

• Gravity: Analog Electrochemical Carbon Dioxide Sensor (0-10000 ppm) x1

This Gravity: Analog ambient light sensor can assist you in detecting light density and provide an analog voltage signal to the controller as feedback. Additionally, you have the ability to trigger other components within your project by setting voltage thresholds.

This ambient light sensor is operational within the voltage range of 3.3 to 5 volts, and is compatible with common controllers such as Arduino, micro:bit, ESP32, RP2040, and Raspberry Pi.
However, please note that the Raspberry Pi board does not have built-in ADC functionality, and therefore requires an ADC expansion module to read the input signals of the analog ambient light sensor, such as the Gravity: I2C ADS1115 16-Bit ADC Module or the IO Expansion HAT for Raspberry Pi 4B/3B+.

To facilitate easier usage of the ambient light sensor, this product is designed with a universal Gravity interface that can be plugged in without requiring soldering. Two screw holes allow you to fasten it to any desired location.
When used in combination with a Gravity IO extension shield, it further simplifies the wiring process, making messy DuPont wires and complex connections a thing of the past and enabling you to focus your energy on your creative designs.

This Arduino Light sensor can capture little change of light!!

If you are a beginner, it is recommended to purchase an Arduino kit with tutorials, such as the Gravity: Intermediate Kit for Arduino and the Gravity: Science Data Acquisition Module Kit for Experiments Education.
These kits come with comprehensive tutorials and all the components necessary to complete a variety of projects, allowing you to gradually learn and build upon your knowledge and skills.

• Supply Voltage: 3.3V to 5V, compatible with Arduino / ESP32 / micro:bit / Raspberry Pi
• Illumination range: 1 Lux to 6000 Lux
• Responsive time: 15us
• Interface: Analog
• Supports graphical programming platforms such as Mind+ and MakeCode
• Size: 22x30mm (0.87″x1.18″)

Project 1. micro:bit Surprise box
Introduction: In this project it shows how the box interacts with flahsing hearts.

Project 2. Hyduino – Automated Hydroponics with an Arduino
Introduction: hydroponics is growing plants without the use of a traditional dirt medium by using a nutrient rich water solution. This is especially great for those people that that have limited areas in their backyard to grow in.

Project 3: Environmental Monitoring System Based on OBLOQ-IoT Module
Introduction: This product is mainly applied in electronic laboratory to monitor and control indicators such as temperature, humidity, light and dust, and timely upload them to the cloud data space to achieve remote monitoring and control of dehumidifier, air purifier, exhaust fan and dimmable light, etc. in the laboratory.

Project 4: micro:bit Laser Target

Introduction: The ambient light sensor sensor detects the intensity of the laser pointer. If it is greater than 400, it will sound the buzzer and the servo will make the target fall and up. Game over when it reaches 10. Press A to reset score to 0.

Project 5. I_NEED_SPOTLIGHT
Introduction: By following this project, it will help to make a toy BIRD. The BIRD will start to perform when the light turns on.

• Wide voltage range from 3.3V to 5V
• Standard assembling structure (two 3mm holes with multiple of 5cm(1.97″) as interval)
• Easily recognitive interfaces of sensors (“A” for analog and “D” for digital)
• Icons to simplely illustrate sensor function
• High quality connector
• Immersion gold surface

• Wiki (DFRobot Ambient Light Sensor)     
• Schematic
• PT550 Datasheet    

• Analog Ambient Light Sensor x1
• Analog cable x1

• Supply voltage: 5v
• Interface Mode: Digital / Analog
• Output:
  • analog mode :0-5v output
  • digital mode: TTL level output (0v or 5v) according to application needs 
• Digital switching signal feedback and dual analog gradation feedback
• You can set the digital mode supports color detection
• Dimensions: 37x10x15mm (1.46×0.39×0.59″)

• wiki
• Schematic
• Sample code

• Smart Grayscale Sensor v1.0 x1