Arduino

In the previous two tutorials of this series, we have seen how to vary the intensity (brightness) of LEDs using the PWM output of ATtiny85. In this tutorial, we shall use a PWM output to vary the speed of a DC motor. DC Motor speed varies as the potentiometer is varied. As we have learned…

An oximeter is a device that measures the amount of oxygen carried by a person’s red blood cells. Oxygen provides energy for our bodies, supports the immune system, helps replace cells that degrade, and more. Low blood oxygen levels can indicate certain health issues. These levels can also decrease as we age, so it can…

Have you ever struggled to fix nails on a wall perfectly parallel to the floor or ceiling? In this project, we have modeled an electronic-level device useful in placing anything perfectly parallel. This device is prototyped on the popular microcontroller board – the Arduino. It uses very few components to build, only an accelerometer sensor…

TFT LCDs are the most popular color displays – the displays in smartphones, tablets, and laptops are actually the TFT LCDs only. There are TFT LCD shields available for Arduino in a variety of sizes like 1.44″, 1.8″, 2.0″, 2.4″, and 2.8″. Arduino is quite a humble machine whenever it comes to process or control…

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…

A very common feature in Android and iOS fitness apps is calculating the number of steps the user walks and the distance he covers. These apps calculate the number of steps walked by the user either using GPS location and manipulating the geospatial data or by monitoring the acceleration vector of the device using an…

In the previous tutorial, we learned we need the following hardware and software tools to build any application using ATtiny85. Arduino IDE software USB SPI AVR programmer PROGISP software So let us build the first LED blinking, “hello world” application for the ATtiny85 microcontroller. Open Arduino IDE. Open LED blinking example from file->example->basic->blink Modify the…

Working with ATtiny85 requires you to learn how to write a program for ATtiny85 and how to download it into its internal Flash memory. Would it surprise you to know that we can write programs for ATtiney85 in Arduino IDE? Yes, it is true. We can write, compile, create HEX files and even download the…

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…

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…

Electromyography (EMG) is a medical procedure that evaluates the health conditions of muscles and nerve cells. These cells transmit electrical signals that cause muscles to contract or relax. EMG is used to read these signals and plot them as numbers or graphs. Typically, EMG is performed by doctors as one part of a diagnostic tool…

The Arduino L293D motor driver shield guide is a robobtics project that involves driving various types of motors. The most common types used for robotic applications include DC, servo, and stepper motors. However, these motors typically cannot be driven directly by Arduino or another microcontroller. This is because of their higher current and power ratings,…

Much like the name suggests, DC motor controllers control the speed and direction of a DC motor. To change the direction of the motor, however, the supply it receives must be reversed. And, to vary the DC motor speed, a pulse-width modulation (PWM) signal or wave must be applied to it.  As the pulse width…

In the previous article of this series, we learned how to change colors in RGB LED strip using any IR remote means generating different colors in RGB LED strip with your fingertips from a remote place using any IR remote. So indeed, it was a very nice application. This time again, we are moving one…

In this tutorial, I am going to measure DC current using Acs712 Hall Effect-Based Linear Current Sensor and arduino uno. Acs712 can measure current precisely and accurately if properly managed. I have gone through various blogs on internet about interfacing acs712 current sensor with arduino and other microcontrollers. I found that all of them are…

In this tutorial, we will learn how to hack a TV (television) remote using Arduino. TV remote communicates with TV using infrared rays. Encoded commands and transmitted by remote, TV internal circuitry decodes them and performs an action on received commands. On the front of the remote, we have an IR led which emits IR…

This is a very nice and interesting robotic project. As the name suggests, “object follower robot” – the robot is meant for following an object. You might have heard of… A smart luggage trolley at railway station/bus station/Airport that automatically moves on battery and motor and it follows the owner A smart cart at any…

The idea of noninvasive current measurement is not new. Commercial devices are available which can measure current without any physical contact. However, the topic was not popular among the DIY community because of the complexity and nonexistence of the compact non-invasive sensors, which could be studied at low power. Luckily, we have small and reliable…

You must have noticed token display boards at many places like food stores, hospitals, banks, various takeaways, etc. Token display systems are used to display token numbers. As these display boards show numeric information, these are easily designed using 7-segment LEDs. The commercial models use large 7-segment LEDs to display token numbers. It is even…

BME680 is a multi-purpose digital sensor, developed by Bosch after years of research, which can measure temperature, humidity, gas, and barometric pressure. Communication with this sensor is possible via the Serial Peripheral Interface (SPI) and I2C protocols. The temperature and barometric pressure accuracy are +-1 and the humidity is +-3. The gases are measured as…