pH Meter using Arduino Uno and LCD Display
pH Meter using Arduino Uno pH scale is used to measure the acidity and basicity of a liquid. It can have readings ranging from 1-14 where 1 shows the most acidic liquid and 14 shows the most basic liquid. 7…
ESP8266 NodeMCU Relay Module – Control AC Appliances (Web Server)
Using a relay with the ESP8266 is a great way to control AC household appliances remotely. This tutorial explains how to control a relay module with the ESP8266 NodeMCU. We’ll take a look at how a relay module works, how…
ESP8266 DHT11/DHT22 Temperature and Humidity Web Server with Arduino IDE
In this project you’ll create a standalone web server with an ESP8266 that displays the temperature and humidity with a DHT11 or DHT22 sensor using the Arduino IDE. The web server you’ll build can be accessed with any device that…
ESP8266 NodeMCU with HC-SR04 Ultrasonic Sensor with Arduino IDE
This guide shows how to use the HC-SR04 Ultrasonic Sensor with the ESP8266 NodeMCU board using the Arduino core. The ultrasonic sensor uses sonar to determine the distance to an object. We’ll show you how to wire the sensor to…
ESP8266 Pinout Reference
One of the nice things about the ESP8266 is that it has a fair amount of GPIO pins to work with. You won’t have to juggle or multiplex your IO pins. However, there are a few things to keep in…
Soil Moisture Sensor Interfacing with NodeMCU
Overview of Soil Moisture Sensor Soil moisture is basically the content of water present in the soil. This can be measured using a soil moisture sensor which consists of two conducting probes that act as a probe. It can measure…
Wemos and PCF8591 example
The PCF8591 is a monolithically integrated, and a separate power supply, low-power, 8-bit CMOS data acquisition devices. The PCF8591 has the four analog inputs, one analog output and a serial I2C bus interface. PCF8591 three address pins A0, A1 and…
NodeMCU i2c Scanner on Arduino IDE
This tutorial of Robo India explains how to get address of i2c device connected to a NodeMCU using Arduino IDE. Detailed Tutorial 1. Introduction: 2C bus is a means of connecting several peripheral input and output devices that support I2C…
ESP8266 and Google Spreadsheet
Google Spreadsheet or Google Sheets with ESP8266 Nodemcu for Data Logging, Temp & Hum DHT11- So far I have covered majority of the IoT platforms for monitoring different types of sensors and for controlling different types of electrical devices. Usually for…