Humidity sensor with led alarm | Arduino project

This page contains Arduino Humidity sensor with led alarm source code. This project is good for someone who wants to make a humidity meter or hygrometer with led alarm if humidity and temperature over a threshold. It's easy to make and doesn't require an external power supply, just use power from an Arduino UNO R3 board (USB power compatible with this project).

Electronic components list:
1 x Arduino Uno R3
1x 20 x4 I2C LCD display
1 x AM 2320 humidity/temp sensor
1 x 5 mm led ( 2 x if you plan to use led for pin 13 instead built-in led)
1 x 1000 ohms resistor ( 2 x if you plan to use led for pin 13 instead built-in led)
Any USB power adapter, 500 mA current at least.

Here is the Arduino code:
AM 2320 library
LCD display i2c library

#include <Wire.h>
#include <AM2320.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x3F, 20, 4);
AM2320 th;
int led2 = 12;

1kHz to 24 kHz | High frequency sine wave test tone

High-frequency sine wave speaker test tone from 1 kHz to 24 kHz for an audio lover who want to test his/her sound system and hearing ability vs frequency. Each frequency duration is 3 seconds. The video contains wave pattern too.

If you use this video as hearing test tone you must use good quality headphones or hi-fi sound system because laptop loudspeaker frequency responds not good both low and high frequencies

Play video below by set video quality to Full HD for the best result.