Gravity: Starter Kit for Arduino

The optical (reflective) module sensor with LM393 comparator, which detects obstacles with high accuracy. The ideal detector for obstacle detection for the installation of intelligent robots.TCRT5000: reflective optical sensor that has a compact construction where the light emitter and receiver are placed in the same direction to detect the presence of an object using infrared reflection on the object. The transmitter is an infrared LED and the receiver is a phototransistor. The sensor allows the detection of an object at a distance of up to 3.5 cm from the white paper and 1 cm from the person's finger.

The resistance of the sensor has a force measurement range of 0-10 kg
Its resistance varies depending on how much pressure is applied to the detection area, the greater the force, the lower the resistance.
Peel and stick the rubber backing on the other side of the detection area to mount.
It can detect the applied force in the detection area in the range of 0g-10kg.
Circular force sensing resistor features:
- Detection area: 1.27cm / 0.5 inches
- Output signal: passive variable resistance
- Force detection range: 0 g ~ 10 kg
- Length: 6 cm / 2.36 inches
- Width: 1.9cm / 0.75 inches

Sparkfun MyoWare 2.0 Muscle Sensor Development Kit  is an all-in-one electromyography (EMG) sensor kit compatible with Arduino. Just snap on a MyoWare 2.0 Shield, add some EMG sensor pads, connect the sensor to a muscle group and flex! The kit also includes the SparkFun RedBoard Plus is an Arduino compatible board and the MyoWare 2.0 Arduino Shield to connect the MyoWare® 2.0 sensor via a cable to the Arduino.

5.8GHz Doppler Radar Motion Sensor features:
- Microwave motion detector module
- The main applications can be security alarms and sensors, Automatic door systems, ATM machines, car reverse systems, light sensors, can also be used for traffic monitoring and monitoring applications.
- High resistance to radio-frequency interference
- Frequency: 5.8GHz
- Operating Voltage: 3.3V - 20V TTL 3.3V
- Standby Current: 3mA
- Detection Range: 3-8 meters, 360 degrees
- Power of Output: 2mW
- Dimensions: 32x23 mm
- R6 - time-delay; initial value 2.2k - 1s, without delay resistance 30s, can be adjusted up to 250k
- R9 - for sensitivity adjustment

This Reed switch module uses a small device called a reed switch.
When the device is exposed to a magnetic field, the two ferrous materials inside the switch come together and the switch closes. When the magnetic field is removed the switch opens. The operating mode: - When exposed to a magnetic field the DO output is high
- Power supply: 3.3-5V
- Contact type: SPST-NO (normally open)
- Use temperature: -20ºC to + 80ºC
- Type Output: Digital (1 - 0)
- PCB dimensions: 32 x 14 mm

Sensor TCRT5000 Infrared IR Tracker Line Obstacle Phototransistor features:
- Operating range: 0.2mm to 15mm
- Receiver: Phototransistor
- Emitter: Infrared Led
- Wavelength: 950 nm

The Grove - Air Quality Sensor v1.3 is designed to test indoor air quality. It can react to carbon monoxide, alcohol, acetone, paint thinner, formaldehyde and other slightly toxic gases. Compatible with 5V and 3.3V power supplies, it can work with Arduino and Raspberry Pi. It features long-term stability and low power consumption. It's the ideal choice for monitoring air quality in your projects.

This small 10-DOF sensor module GY-91 is more compact than the GY-80 module.
The module uses a unique MPU-9250 chip combination with built-in 3-axis gyroscope, 3-axis accelerometer, digital compass and BMP280 enhanced barometric pressure sensor.
The MPU-9250, delivered in a 3x3x1mm QFN package, is the smallest 9-axis MotionTracking device in the world and incorporates the latest InvenSense design innovations, allowing dramatically reduced chip size and power consumption, while improving the performance and the cost. Enhancements include low-power accelerometer mode support with only 6.4μA of and provides improved 16-bit compass data resolution (0.15 μT per LSB).

The module is based on a touch sensitive IC capacitive touch switch module (TTP223B).
In the normal state, the module produces Low power consumption. When a finger touches the corresponding position, the module output is high, if not touched for 12 seconds, it switches to low power mode. Digital Touch Sensor B21 features:
- Low power consumption
- Input voltage: 2 - 5.5VDC
- Can replace the traditional touch of a button - Four M2 screws diameter 2.2 mm that position the holes for easy installation
- 3-pin control interface:
1- GND
2- VCC
3- Control signal (output pin)
- Power indicators: Bright green LED when the sensor is on

The module uses a 24-bit high precision A / D conversion chip HX711.
The input circuit can be configured to provide a bridge.
The electric bridge voltage sensor model (such as pressure, weight) is an ideal sampling module with high precision and low cost. Module features: - Two selectable differential input channels
- Active low noise PGA with selectable gain of 32, 64 and 128
- Power supply regulator for load cell and ADC analog power supply
- Oscillator on chip that does not require external component with optional external glass
- Power-on-reset on the chip
- Simple serial control and serial interface: controls driven by pins, programming is not required
- Output data rate 10SPS or 80SPS selectable