Category: Electronics

Problems with ESP32 configured as both Client and AP

In one project I had an ESP32 configured both as Access Point (AP) and as a Wifi Client. Everything was fine, until I changed my home Wifi password. After changing the home Wifi password I wanted to change the Wifi password set on the device through the Web UI I made and hosted on the… Continue reading Problems with ESP32 configured as both Client and AP

FASTLed Library and RGB LED

Recently I was trying to make a device that will indicate different status through different light colors. Now after developing everything a strange thing started to happen – the RGB LED was not showing the colors properly. For example – suppose the current color is Green and then I put Red. It is not glowing… Continue reading FASTLed Library and RGB LED

Humidity sensor

There are many Humidity sensors available. DHT-11/DHT-20/DHT-22 from Aosong are the cheapest and easily available in India. DHT-11 is the cheapest. DHT-22 or AM2302 is a good choice for hobby purposes or college projects. DHT20 has replaced DHT22 but still DHT22 is still the most available one. DHT20 is colored black and DHT22 is white.… Continue reading Humidity sensor

ESP-01 Serial.println() or Serial.print() not working

I went crazy, mad trying to understand why the module is not printing anything to the Serial Monitor or receiving any AT commands. I went through lots of articles on the internet and was on the verge of throwing the module away. Just that my mind was not willing to believe that it is dead… Continue reading ESP-01 Serial.println() or Serial.print() not working