Interface between Arduino & a smartphone/comp using Wifi

Hello my fellow Arduino mates (is there any specific term? Sorry, a newbie here!)

I have been reading this forum for few days and finally thought to make a profile to get some help now and then later (when i become a pro) provide help to others! :slight_smile:

I am trying to make a Wireless Door Lock and Message Display Board System! The idea is to connect a smartphone/computer (through HTML?) to Arduino over Wifi network and use it to send and receive simple messages that will be displayed on a LCD connected to the Arduino board which is fixed on the door. Is this possible? Do I have to use a wifi shield or can I also use an ethernet shield with a router? Which will be easier?

Also, if the above is feasible, I will then go on to expand this into a door lock system where the phone/computer can be used to lock/unlock the door by using a simple passcode lock over the wifi network. So, a person can remotely lock and unlock his/her door from anywhere through wifi. Is this feasible too?

I don't want you to give me steps on how to do it or anything like that? Its my project, I will figure that out slowly, but I just want to know if this idea is even possible and feasible enough!

Thank You so much!
Have a great day ahead!
Cheers
Shek

#Modify
You can ask any questions in your mind? Or if you think I am talking absurd, you can say that too! But i just want to know something about the above idea! Thanks!

Sorry its taken a while to get a response, usually people are good about responding. Its wednesday so it makes sense.

Yea, its totally feasible. I personally haven't ever done it (I always check to make sure my door is locked before I leave) but it can be done for sure. If you are looking to send a command to the computer, with the smartphone, while on the same network, it would be a simple matter of getting the computers network address. Although if you are trying to set it up over the internet, then it does get a little more complicated although I know it is possible.

Once you've got that going, then the display shouldn't be too hard. I know freetronics and suretronics makes some led displays that are simple to use. You could also get an lcd from adafruit or sparkfun that would have some good support on getting it to work with the arduino.

If I'm understanding you right, then you would just use the TX and RX pins for the communication between the arduino and a wireless module. The wireless module would be connected to the network, which the computer would be as well which the phone would be accessing through html, I guess. Once you have the wireless all good to go, the display shouldn't be too bad, depends on how nice you want it. You could use a simple 1602 display with an I2C backpack from adafruit which would free up the PWM pins needed to use a door lock servo/motor/whatever you want.

NewThingsAreFun:
Hello my fellow Arduino mates (is there any specific term? Sorry, a newbie here!)
idea is to connect a smartphone/computer (through HTML?)

You probably meant HTTP, not HTML. One is a communication protocol, the other is a markup language.

NewThingsAreFun:
I have to use a wifi shield or can I also use an ethernet shield with a router? Which will be easier?

To communicate over Ethernet wireless or wired, you'll need either a wifi shield or an Ethernet shield.

Home security systems are a common Arduino project...