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 https://github.com/hibikiledo/AM2320
LCD display i2c library https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library


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

0.9 volt to 5 volts boost converter test.

I brought  0.9V-5V to 5V DC-DC Booster Module from eBay and I thought you should know the fact about this module before you buy it.
The circuit module is very cheap (2 pcs for 1$ from eBay with free shipping) and very tiny to fit the small projects that require batteries if you not serious about Voltage swing with low voltages than 2.4 volts source.

You can see the test video below.


The advantage of this step up module:
- high efficiency
- incredibly low cost
- small size
Enjoy your project!!!

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