DIY Portable Arduino Weighing Machine using Load Cell

This weighing machine is perfect for local stores, where they pack items in bulk quantity. Like commercial products, our weight scale will have a zero button that zeroes out the scale. Also, It has an option to set weight for measurement, when the measuring weight reaches the set weight, a buzzer beeps fast and stops when the set weight equals the measuring weight. This way, the user can pack it just by hearing the sound and would not have to look at the display. As this is a very simple project, we will be building this very easily using components like Arduino and strain gauge load cell. 

Watch the below video for the complete working of this Arduino Weighing Machine.

Get the circuit diagram, code and required instructions to build the project in this tutorial.

Using Arduino Millis() Function for Multi-tasking

This tutorial covers performing Multitasking with Arduino millis function. Generally a delay() function is used in Arduino for a periodic task like LED Blinking but this delay() function halt the program for some definitive time and don’t allow other operations to perform. So this article explains how we can avoid use of delay() function and replace it with millis() to perform more than one tasks simultaneously and make the Arduino a Multitasking controller. Before going into detail let’s start with understating Multitasking.

To learn how to make the circuit and write code for performing multitasking in the this detailed Arduino Millis tutorial

Below you can watch the demonstration video:

How to Build a Compact and Low Power Solid-State Relay to Control AC Home Appliances using ESP8266

The best alternative for an electromechanical relay is a solid-state relay. A solid-state relay is a type of semiconductor-based relay that can be used as a substitute for an electromechanical relay to control electrical loads.



In this project, we will make a Solid-State Relay using a single component and we will control an AC load in 230VAC operation. The specification used here is limited, we have chosen 2A of Load to be operated using this Solid-State-Relay. The aim is to build a compact PCB for a solid state relay that could be directly interfaced and controlled with the 3.3V GPIO pins of Nodemcu or ESP8266. To accomplish that we have fabricated our PCB boards from PCBWay and we will assemble and test the same in this project.
View the full project tutorial

Watch the video below:

Contactless Smart Infrared Thermometer using Arduino and Android App

In this article we explain designing a Low cost, Easy to build Contactless Thermometer that can measure body temperature, log them into an excel along with the picture of the individuals so that the record can be easily shared with concerned authorities. 

We can create a simple Android application that can communicate with our thermometer and perform other activities like data logging and image capture. This way we can not only make it work faster but can also increase its potential application by instantaneously sharing log results with pictures on WhatsApp, Gmail, or any other preferred platform. This is why we created our Android application called “Easy Scan” which is open-sourced and the APK is also free to download, more on this later. So the only material required for this project are as below:

MLX90615 IR Temperature Sensor

TCRT5000 IR Sensor

Arduino Nano

You can check out the link below for the complete DIY project for this handheld thermometer.

Infrared Thermometer Project

Watch the video below to understand more how this thermometer works:

For similar interesting projects, please see the links below:

Arduino Projects

Electronics Projects

Design your own Compact 5V/3.3V SMPS Circuit for Embedded and IoT Projects

Here we will build a SMPS that can be used for general purposes and has a simple module shape to be used in space-related situations. Nowadays, the Internet of Things uses various wifi-based processors like NodeMCU, ESP32, and ESP12E, etc. which operate on 5V or 3.3V. These modules are highly compact and hence to power these boards, it makes sense to use smaller SMPS circuits that can go on the same board, instead of using a separate SMPS circuit. Hence in this article, we will learn how to build a SMPS circuit that can either output 5V or 3.3V (hardware configurable using jumper), the circuit design and PCB layout is also provided, so you can simply port this into your existing design. Here our PCB boards are manufactured by PCBGoGo, a china based low cost high quality PCB prototype and PCB assembly service company.

View the full project tutorial here: https://circuitdigest.com/electronic-circuits/design-your-own-compact-5v-33v-smps-circuit-for-embedded-iot-projects

How to Use Semaphore and Mutex in FreeRTOS with Arduino

In previous tutorials, we have covered the basics of FreeRTOS with Arduino and the Queue kernel object in FreeRTOS Arduino. Now, in this third FreeRTOS tutorial, we will learn more about FreeRTOS and its advance APIs, which can make you understand the multi-tasking platform more deeply.

Semaphore and Mutex (Mutual Exclusion) are the kernel objects that are used for synchronization, resource management and protecting resources from corruption. In the first half of this tutorial, we will see the idea behind Semaphore, how and where to use it. In the second half, we will continue with Mutex. Read the complete tutorial

Stereo Audio Pre-Amplifier Circuit with Bass and Treble Control using Transistors

The use of an audio pre-amplifier ensures good audio quality and provides options to modify our sound system by using this as a primary audio circuit/device before feeding the audio signal to your amplifier/subwoofer/home theatre system. Also, we can control bass and treble for different songs and get a wide range of control over our audio system. This type of circuit that provides Bass and Treble control is also known as a BT Circuit Board. In this article, we will build a stereo pre-amplifier circuit with bass and treble control.

View the full circuit design article: https://circuitdigest.com/electronic-circuits/stereo-audio-pre-amplifier-circuit-with-bass-and-treble-control

For more circuits, visit: Electronics Circuits

DIY Automatic Hand Sanitizer Dispenser

In this project, we will build an Auto Hand Sanitizer Dispenser with an LCD which also shows the live count of Coronavirus cases. This project will use ESP32, Ultrasonic Sensor, 16x2 LCD Module, Water pump, and Hand Sanitizer. We are using Esri’s API Explorer to get the live data of Covid19 infected people. An ultrasonic sensor is used to check the presence of hands below the outlet of the sanitizer machine. It will continuously calculate the distance between the sanitizer outlet and itself and tells the ESP to turn on the pump whenever the distance is less than 15cm to push the sanitizer out.

Watch the video below for the working of this automatic hand sanitizer dispenser.




For the full project tutorial, visit: CircuitDigest.com