Optical fingerprint scanners are prominent security devices nowadays. These scanners are low-cost and easy to use with any embedded hardware platform. The scanners have built-in memory and a controller to store and compare fingerprints. Usually, optical fingerprint scanners have a USB and/or UART port to communicate with external controllers or computers. The scanner handles enrollment…
Arduino-based portable pollution monitor with OLED display
A majority of middle-aged people suffer from health issues like asthma and breathing problems, particularly in cities. Air pollution is the major cause of it. In this project, we have designed a portable device that detects different air pollution metrics and displays them on a small OLED screen. People with respiratory issues can use the…
Arduino-based altitude meter using BMP180 sensor
BMP180 is a digital pressure sensor designed for low-power, low-voltage operation in mobile phones, navigation devices, and personal digital assistants. The sensor has an I2C interface to communicate sensor data. It can operate on 2.5~3.6V and consumes only 12 uA even in the ultra-high-resolution mode. The sensor can be used for several applications, including measuring…
Arduino-based heartbeat monitor with graphical heartbeat display
The measurement of pulse rate or heartbeat is a very common medical procedure. Quite often, the patient kept under observation is essentially monitored via their pulse/heartbeat rate. Pulse rate varies from person to person. The pulse is lower when we are resting because at that time, the body does not need much oxygen, and the…
How to interface SSD1306 OLED with Arduino using SPI
SSD1306 is a popular OLED display driver. Portable and wearable devices are the new trends. Small OLED displays are just perfect for such compact and portable devices. SSD1306 is a single-chip CMOS OLED/PLED driver. It can manage a 128×64 dot-matrix graphic display. It is designed to control common-cathode OLED panels. The chip has several built-in…