12V 1A SMPS Power Supply Circuit Design
In this tutorial we will cover how to build a 12v SMPS circuit that would convert AC mains power to 12V DC with a maximum current rating of 1.25A. This circuit can be used to power small loads or even be adapted into a charger to charge you lead-acid and lithium batteries.
Find here the DIY article: https://circuitdigest.com/electronic-circuits/12v-smps-power-supply-circuit-design-on-pcb
DIY Location Tracker using GSM SIM800 and Arduino
With driver-less cars carrying passengers and Trucks carrying valuable cargo, it brings in the need for a Fleet Management system in which we need to track them to know their location and ensure if they are at the right place at the right time. Generally a GPS Module is used for any sort of location tracking but here in this tutorial we will use GSM SIM800 module to build a simple Location tracking system with Arduino. This GPRS tracking system compromises the GSM modem and the microcontroller (Arduino) and is fabricated on a PCB from PCBGOGO. It works in such a way that when a phone call is made to the GSM module, the module will check the location and sends it back as a text message with Google map link to the number from which the phone call is made. This link when opened on phone will pin the location of modem on Google Maps. Sounds Interesting enough!!?
Check out the complete project: https://circuitdigest.com/microcontroller-projects/diy-location-tracker-using-gsm-sim800-and-arduino
The advancement in Electric Vehicles, Drone and other mobile electronics like IoT Devices seems to be promising for the future. One common thing among all these is that they are all powered by batteries. Following Moore’s law the electronic devices tend to become smaller and more potable, these portable devices should have their own source of power to operate. The most common battery choice for portable electronics today is Lithium Ion or Lithium Polymer Batteries. While these Batteries have a very good charge density they are chemically unstable under harsh conditions hence care should be taken while charging them and using them.
Read the complete article with all the needed files: https://circuitdigest.com/microcontroller-projects/two-step-lithium-battery-charger-circuit-with-cc-cv-mode
In this DIY session, we make an Arduino Motor Driver Shield to drive DC motors, stepper motor and Servo Motor. Compatible with Arduino UNO and Arduino Mega, this motor driver shield can operate 4 DC motors or 1 stepper motor and 2 servo motors at a time. Here two L293D Motor Driver ICs are used for driving motors and an 8-bit shift register for controlling them.
Arduino Alcohol Detector Circuit Board
In this project, I am going to Interface an Alcohol Sensor with #Arduino. Here I have designed an Arduino Shield PCB using EASYEDA online PCB simulator and designer. Arduino Alcohol Detectorwill detect the alcohol level in breath and by using some calculations in code we can calculate the alcohol level in breath or blood and can trigger some alarm.
Simple Lie Detector Circuit
The concept behind this Lie Detector Circuit is that, we assume when a person lie he kind of pumps up his anxiety level which makes him sweat and develop moisture on his skin. We then use this piece of circuit to detect if there is moisture on his skin and based on the result we glow and LED, a green one for truth and red for lie. Of course yes this cannot be claimed as a lie detector, but you can use this to play with your friends and have fun. More than that you get to learn stuff.
DIY Stun Gun
Here you can find a detailed tutorial to build your own stun gun with circuit diagram and PCB design files.