How does the timer work on an Arduino?
The user simply enter the time in minutes and seconds and press the Asterisks “*” key on the Keypad. The total time is displayed in seconds. The timer is started which is based on the millis function. The load which is connected with the relay is turned ON.
What can you do with a countdown timer?
With the help of this Countdown timer, you can control different types of electrical loads like for example Light Bulbs, Heaters, Water Pumps, Washing Machines, Fans, etc. in fact, this countdown timer can be used anywhere where you need to control anything on the time basis. This countdown timer is ideal for AC and DC loads.
How can I convert a 16×2 LCD to an I2C?
As you can see the circuit diagram is really simple. All the 16 pins of the PCF8574 driver module are connected with the LCD pins. Using these connections you can convert any 16×2 LCD into an i2c supported LCD.
How long do I have to set the countdown on my Arduino?
When you turn the circuit ON next time, it will remember the time which you have set previously, you may set a new time or just begin the countdown with the previously set time using start button. Note: The minimum time you can set is 1 minute (00:01:00) and the maximum time you can set is 24 hours (23:59:00).
The timer display or an analog dial counts backward and shows the remaining time left and the timer eventually reaches zero. For example: Traffic lights, microwave oven timer, sleep timer on TV / computer etc.
How does an Arduino board track the time?
An arduino board is utilized here which acts as brain of the project, it tracks the time and actuates a buzzer and an (optional) relay and also it controls the 16 x 2 LCD display where it shows the amount of time left in HH:MM:SS format. This countdown timer consists of 4 buttons using which you can set, start and stop the timer.
Why is my Arduino not detected in Windows 10?
Your IDE will not show the connected Arduino board and you device manager will say “unknown USB device”, when you try to fix with windows tools you will still end up not fixing the issue. To find out why the Arduino boards are not detected, let’s inspect the Arduino board’s USB to serial converter chip.