Electronic development

Electronic switch/Timer off

Microchip PIC C Electronics

28 Nov, 2019

Description

Portable electronic switch that allows you to control small electric devices in a easy way. With just three buttons and a 7 segments display you can configure a built-in timer off to set an specific time, between half and 4 hours, where the electric item will turn off.

In addition, the device includes three LEDs that show if it is connected, if the chosen time has elapsed and how much time is left to finish the count.

Function:

  • Timer off: allows you to set a certain working time to turn small electric devices off at the specific time. It size (8.5x6x3.5cm) is design to be easyly carry on, so you can connect it wherever you go and let the electrical items be on in the time you set.



# Item function
1 Set/Start/Cancel
2 Increase time
3 Decrease time
4 5 minutes left indicator
5 Half time indicator
6 Timer start indicator
7 Time indicator

How to use it?

Timer off

  1. Enter to the timer menu by pressing the yellow button (). The time indicator (7 segments display) must turn on showing number 3, what means that time select is 3 hours.

  2. Select the desired time by pressing blue button () to increase, and red button () to decrease. When the time indicator turn on its red dot at lower right corner, it means that you must sum half hour to the current number shown.

  3. Once you've chosen the timer time, start it by pressing the yellow button (). The time indicator must turn off and the red LED must turn on (), indicating that the timer has started. When half time has elapsed, the red LED will turn off () and yellow one will turn on (). When it's 5 minutes left to finish the count, yellow LED will turn off () and green one will turn on (). Finally when time has finished, all three LED's will blink trhee times and the electric item connected will turn off.



Improvements

  • Voltage protection: Using additional electronic circuits, this device can protect connected electrical elements to it from over or under voltage and wait a while until the voltage is stabilizes.

  • WIFI connection: this allow you control the electronic device from anywhere in the world while it's connected to internet. It can be controlled either by your phone or a virtual assistant like Alexa of Amazon.

Those are just some changes, but many other improvements can be done depending on your needs and what you want.