GrovePi+ Board

The Grove Ultrasonic Distance Sensor is an ultrasonic transducer that utilizes ultrasonic waves to measures distance. It can measure from 3cm to 350cm with the accuracy up to 2mm. It is a perfect ultrasonic module for distance measurement, proximity sensors, and ultrasonic detector. This module has an ultrasonic transmitter and an ultrasonic receiver so you can consider it as an ultrasonic transceiver. Similar to sonar, when the 40KHz ultrasonic wave generated by the transmitter encounters the object, the sound wave will be reflected back, and the receiver can receive the reflected ultrasonic wave. It calculates the time from the transmission to the reception, and then multiplies it by the speed of the sound in the air(340 m/s) to calculate the distance from the sensor to the object. Compared with traditional ultrasonic module, the HC-SR04, the Grove Ultrasonic Distance Sensor integrates a single-chip microcomputer, and the transmitting signal and the receiving signal share one pin by time division multiplexing, so only one I/O pin is occupied. Another difference is that HC-SR04 only supports 5v voltage, while Grove - Ultrasonic Distance Sensor supports 5v and 3.3v. As we know, the Raspberry pi I/O only supports 3.3v. Therefore, Grove - Ultrasonic Distance Sensor can be directly connected to the I/O of the Raspberry Pi, but HC-SR04 needs to use a voltage conversion circuit. Features: 3.3V/5V compatible, wide voltage level: 3.2V ∼ 5.2V. Only 3 pins needed, save I/O resources. Wide measurement range of 3cm ∼ 350cm. Easy to use, grove connector, plug and play. Possible Applications: Distance measurement. Ultrasonic detector. Proximity alarm. Smart car/buggy/robot.

No soldering, no jumper wires, no jitters. Simple, easy, and fast. This is how this kit gonna make you feel when you use it to make your IoT devices - a totally enjoyable making process.  The Grove Base Shield in the kit can works on a lot of Arduino compatible development boards including the Intel Edison for Arduino, LinkIt One, and Arduino 101, etc

The Grove Temperature and Humidity sensor is a digital relative humidity and temperature sensor with a small footprint that features a grove system connector. It utilises a TH02 sensor that has a good level of accuracy when used in non extreme climates/conditions. It provides accurate humidity readings from 0-80% (±4.5%) and accurate temperature readings between 0-70°C (±0.5°C). Both the temperature and humidity sensors are factory-calibrated, so no calibration is required. It has an operating voltage of between 3.3V - 5V and has high reliability and stability and requires an I2C Grove compatible interface. Features: It provides accurate humidity readings from 0-80% (±4.5%) and accurate temperature readings between 0-70°C (±0.5°C). Wide operating voltage range:(3.3V ∼ 5V). Low Power Consumption. Good reliability and stability. It operates as an I2C device. It is factory-calibrated, so no calibration is required.