This is the complete detail you can have to create your own Global Robo that can be driven by sending DTMF tones from your mobile phone!!!!!!! "" Yes!! your mobile phone""
All you need to do is to have a DTMF tone decoder IC and some capacitors and resisors to complete the circuitry along with two mobile phones and a headphone for inputting the DTMF tones into the circuitry and u r done.
The complete list of bill of materials is provided below along with the circuitry with a little explanation of how the complete circuit works.
Bill of Materials:
MT8870 dtmf decoder ic
100k resitor 2pc.
300k resistor 1pc.
3.57945Mhz crystal oscillator
0.1 uf capacitor 2pc.
4 LED
connecting wires....
Working: while the input from the mobile using a headphone is connected b/w the 0.1uf capacitor and the ground, DTMF tones can be transferred to the decoder ic(8870) and once the ic is powered up the o/p can be seen by connecting LED's at Q!, Q2, Q3 and Q4 o/p of the decoder ic.
The output on the Q1 to Q4 pins of the decoder IC has been shown in the image.
the o/p of the decoder ic then can be connected to a motor driver ic like(L298 or L293D) to drive some motors or relays as a switch to operate some devices remotely as the Mobile phone connected can be called from anywhere in the world and by pressing the keys the DTMF tones can be transmitted to the receiving end mobile and hence any device connected can be operated globally.
As soon i get a camera i will Upload the image of my circuit and the robo i made and operated using my mobile phone.
12 comments:
hii !!
nice informative blog!!
well i cam here searching for the dtmf decoder ic,,bcz i too have to submit the same project as urs in my college!!
i wont ask u for the project(as that would be cheating) ,,but can u pls tell me where can i find the pin configuration & desription of dtmf decoder ic,i was unable to find it,,can u pls help!!
my email id is
starian2008@gmail.com
thanx
take care!!
hi
its really nice project
just remember that output from headphone must be connected to its input pin shown and ground
it works
try it
hi!!
M praveen...
watz the input from the headphones mean? we dont even have microphone in that circuit...pls reply soon at praveenrajyam@gmail.com
hi every one...
i just wanna know wat the dtmf code comes for the keys
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all web sites have two tables given for it...one is matrix type and one is table type....
in both if u compare the values for frequency's are interchanged....so can u pls tell me ...wat is the actual frequency and codes for keys..
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thanks...
HITESH TAK
hii!!!
i made the same project to be submitted as minor project in our college... is there any chance that you have project report for the same and wont mind forwarding it??
thanx bro...
hii ..m manoj ku. moharana from bhubaneswar..
m now doing d same project ..
Is there any restrictions of using any type of mobile phone?..bcoz all cells cann't work d same..pls reply soon at manojkumar.tech@gmail.com
how should i recognise the tip and ring wires of the ear phone
cn u tel me ...camera is necessary 4 diz projct or not...n wat r its application ?
hi.. m mahendra
i have designed the same ckt bt ths is not workng with my lg cellphone..plz reply soon bcoz i have to present it within some days...my email is mahisngh5ec@gmail.com
What does grounding mean? How to do that?
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