This is an electronics circuit note on how to control household appliances with Arduino and relay . A note on how to connect household appliance (like AC bulb, Soldering Iron, Workbench Power, AC motors etc.) using an Arduino Nano, a 5V relay module…
The ESP32 devkit v1 and alike ESP32 boards have 25 usable GPIO pins exposed, many of which are input only pins (4 pins which can only be used as digital input pin), many are strapping pins (5 pins which are used for boot control and should not be se…
Usually if we want to use Arduino with 16x2 LCD to display some message, usually 6 I/O pins of Arduino are required as illustrated in the blog post Arduino Keypad and LCD Interfacing with Code . However, sometimes we need those I/O pins for interf…
Here it is shown how to expand Arduino's I/O using MCP2307 I/O expander IC with example of a button-controlled LED. The MCP2307 is a 16-bit input/output (I/O) expansion chip manufactured by Microchip Technology that can be used to add extra inpu…
The magnitude and form of signal from sensors such as microphone, gas sensors, piezo sensors are not in the form that can be sensible be read by the Arduino input pins. And so the sensor signal are often required to be conditioned, transformed into …
Arduino has 5V capability and one can use the analog pins like A0,A1 etc to measure voltage upto 5V but what if you want to measure voltage more than 5V like 9V battery voltage for example. You cannot the 9V voltage source to the analog input pins …
Playing audio with Arduino opens up endless possibilities, from automated alerts to interactive robotics projects. In this guide, I’ll show you how to generate audio using an Arduino and a buzzer (or even a small speaker). We’ll start with a simple…
In this blog post, I want to show how one can build a sophisticated pH meter using an Arduino Uno . This electronics project goes beyond simple plug‑and‑play modules by employing a specialized quad op‑amp configuration to handle the extremely sensi…
