Remote Controlled Car (Wireless)

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This is my second project.To make this you need three things
1. RFID module
2. IC HT12D and IC HT 12E
3.Atmega8 or any other Micro-controller

I’ve finally got a nice and cheap RFID . It cost me around Rs. 450. In order to use this you need to have HT12D and HT12E. HT12D is 1:4 line decoder IC and HT12E is an 4:1 line encoder IC. RFID consist of two chips transmitter and receiver, with the transmitter connect HT12E and with the receiver connect HT12D. You can find the connection in the data sheet of these IC’s . Next you need to make a remote ,which is very simple if you use push buttons.Program your micro-controller according to the data you send and connect your car to it.
Some useful data sheets:
1. HT12E
2. HT12D

I hope you find this project intresting . If you need any help feel free to contact me.

Sanchi  Goyal

Mobile/DTMF Controlled Car

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DTMF: Dual Tone Multiple Frequency

After working on this project all night, I’ve finally managed to control the car with my mobile phone! I made this cheap car from a foam sheet(cheap, strong and gets cut by a thermocol cutter) a few months ago. I didn’t go for high-end cars because, apart from being expensive, they use analogue signals to give precise speed and direction control.This car have two wheel controlled by AVR Atmega8, and a caster wheel .

The first step was to get HT9170 B/D. It is a DTMF decoder, which converts the dial number’s frequency into a 4 bit binary equivalent.The second step is to interface this IC to a micro-controller. I used AVR Atmega8 for this purpose.You can give input to the DTMF chip using a headphone, you need to buy a cheap headphone then break it from the point from where you listen the sound, clean the solder and resolder it according to your requirements .

Final step is to dial a call from another mobile to your mobile connected to the car and you can control your car . I used the keys 2,8,4 & 6 for forward,backward,left and right respectively.

I really enjoyed working on this project. I’m really looking forward to use this car in my future projects! I plan to attach a wireless camera on the car for some extra fun. However, I don’t have a wireless camera at this moment. I really hope I get a nice and cheap wireless camera soon. Anyway, I hope you found this project interesting. I’d love to hear your comments and ideas. Feel free to contact me if you’re planning to build your own Mobile control car.

Sanchi Goyal