Gravity: Starter Kit for Arduino

Speed sensor module for Arduino motors features:
- Slot-type optocoupler sensor, slot width: 10 mm.
- The encoder module is a device that can help you in the creation of your robotics and automation project, whether you want to know the speed of a motor or the exact position of it.
- Output Out - Emits a low level when there is no block in the slot, otherwise it produces a high level. The operating mode: - When the sensor is blocked the OUT output is high
- Power supply: 3.3-5V - Current consumption 15 mA max.
- PCB dimensions: 25 x 20 mm

Level sensor for liquids with float. The liquid level sensor acts as a switch. Liquid level float sensors are used when constant control and regulation of the liquid level (water, oil and other fluids) is required such as extraction pumps. The sensor is equipped with a float with a magnet which, acting by the buoyancy force of the fluid, moves along the tube, shortening or opening the reed switch.

It can be used to detect liquid levels that are too high or too low. Ideal for all those applications where the level of non-corrosive liquids such as water tanks or aquariums needs to be monitored. It is made of stainless steel.

This detection module that allows you to detect your heart rate and blood oxygen level from your Arduino project. You can monitor your blood oxygen level yourself to avoid going to the doctor or pharmacy on purpose. Simply press the sensor with your finger and wait for the reading of hemoglobin (Spo2), heart rate and Perfusion Index (PI%). It is a solution as an integrated heart rate sensor and pulse oximetry, which includes two LEDs, a photodetector and is optimized for analog low noise optics.

MH-Z14A NDIR infrared gas module is a small size and common type sensor using the non-dispersive infrared (NDIR) principle to detect the existence of CO2 in air, with good selectivity, non-oxygen dependent and long lifetime.

The module has two outputs: analog A0 and digital D0.
digital output D0 - signal 0 or 1 appears depending on the configuration of threshold.
The threshold is fixed with the potentiometer. Characteristic: - Operating voltage: 3.3V -5 V - Sensitivity adjustable by potentiometer
- Dual output mode: analog and digital
- Red LED - power indicator
- Green LED - digital switching output indicator
- Measurements PCB: 3 x 1.5 cm
- Sensor measurements: 5.4 x 3.9 cm

12VDC plastic solenoid valve. Normally closed. Liquid can flow in one direction and a minimum pressure of 0.02Mpa (3 PSI) is required. This liquid valve would be a great addition to your robotic gardening project. There are two 1/2 ″ outlets. Normally, the valve is closed. When 12VDC is applied to the two terminals, the valve can be opened and pushed.

It consists of three principles of induction of primary colors, if you know the composition of all types of color values, you can know the color of the test object.
For TCS230, a color filter is chosen, only a certain primary pass is allowed, it is stopped by another color. For example, when choosing a red filter, the incident light can only be stopped in red, blue and green, so you can get the intensity of the red beam of light.
For the same reason, the choice of other filters, can obtain the intensity of blue light and green light.
Through these three values, the color of the light can be projected onto a TCS230 sensor. Color Recognition Sensor GY-31 TCS230 TCS3200 features:
- Operating voltage: 3 - 5 VDC
- Model GY-91
- Chip TCS230 TCS3200

Ultraviolet ray detection module 200-370nm with a supply voltage of 3.3-5 VDC and a very low consumption of 0.1mA.
100% compatible UNO module.
Characteristic:
- Operating voltage: 3.3-5 VDC
- Output voltage: 0-1 VDC
- 3-pin connector:
- OUT: output signal
- VCC: Supply voltage
- GND: Ground connection - Test accuracy: ± 1UV INDEX
- Current: 0.06mA (typical), 0.1mA (maximum)
- Wavelength of the response: 200nm-370nm (ultraviolet rays) - Response time: less than 0.5 seconds
- Operating temperature: -20ºC - + 85ºC
- Size: 19.80 x 15mm

The Grove inventor kit is a great extension set for your micro:bit. By using Grove shield for micro:bit you are able to connect all the modules included in the pack purely by the Grove connectors with no need to solder or wire any parts. Now you can focus only on programing with your great mirco:bit.

This photo-resistance module is very sensitive to ambient light. Activation of the microcontroller or retransmission modules,
The brightness module of the ambient light reach the set threshold, the output is high when the ambient light exceeds the set threshold.
The DO output can be connected directly to a microcontroller to detect the light environment and create a light control switch.
It has a speed range of 0% to 100%. Digital Light Intensity Sensor with Photo Resistance with LM393 Controller features:
- Operating voltage: 3.3 - 5 V
- Input current: 50 mA
- Use a very sensitive photo resistance
- Use a LM393 wide voltage comparator, high quality output signal
- Adjustable potentiometer can regulate the brightness of detected light