Combining multiple tones and create harmonic melody. I like music. In Arduino IDE example, I like the most is toneMelody. It is simple yet interesting. However it is quite boring to play monotone. So I decided to play multiple tones and create harmonic melody, like you're playing piano just convert it into individual tone to be played by each Arduino board.
I'm using Maker UNO (Arduino Uno compatible board), because it has built-in piezo buzzer connected to pin 8. It cost only $6 and I use 4 of them to play Un Poco Loco (Disney Coco).
Made by Idris Zainal Abidin.
Get your heart rate, not just an IR sensor reading. In the set of 37 sensors for Arduino, there's a heartbeat sensor. The name promises too much. People tend to think it provides a digital number through I2C or something similar, a number which is the heartbeat rate. What the sensor provides is just an "analog" value from 0 to 1023, telling how much infra red light the light sensor receives, or actually how much something is shading the light sensor. The higher value, the less infra red light.
In short: place your finger between the IR led and the light transistor of the sensor. Your heartbeat dilates the blood vessels in your finger, which will filter the IR. This creates a pulsating signal.
In this project I describe how this signal is converted into a heartbeat rate like 66 BPM (beats per minute).
Made by Johan_Ha.
A weather station which measures temperature, air humidity, and soil moisture and sends this data to the cloud using the SLabs-32 board.
Made by haarislabs. Published in SparkFun.
An IoT Minecraft Castle implemented in a Raspberry with NodeRed, Python and Intel Edison.
Made by Yael Castro. Published in Intel and Raspberry Pi.