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…

How to remove scratch coating from mobile phone camera


Now a day a mobile phone camera lens cover coating with anti-glare, scratch resistance. However, every coating material can be scratched easily even the smartphone camera coating with scratch resistance material, and it makes the camera quality drop significantly. 

The best way to fix this problem is removing the scratches coating off the camera lens cover, but you need to remove it the right way or you may end up make more scratches to the camera lens cover.

My instruction is easy to do and make a pleasant result. All tool you need is old sim card adapter and car polishing(no rubbing bead type)

You may have a question in your mind that why I use sim card adapter as the rubbing tool.
- The simple answer is a sim card adapter made of plastic that softer than commercial cell phone camera lens cover.

Please check the video below for the instruction and before and after comparison.




Comments

  1. Replies
    1. Some toothpaste has micro bead that make scratch even worse.

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