Picture of Cellphone Operated Robot
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This Instructible is entered in the Category: 13 - 18 of the National Robotics Week Robot Contest




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Step 1: Component Required

Picture of Component Required
Component Required:

IC1 - MT8870 DTMF decoder
IC2 - ATmega16 AVR microcontroller
IC3 - L293D motor driver
IC4 - 74LS04 NOT gate
D1 - 1N4007 rectifier diode
R1, R2 - 100-kilo-ohm
R3 - 330-kilo-ohm
R4-R8 - 10-kilo-ohm
C1 - 0.47μF ceramic disk
C2, C3, C5, C6 - 22pF ceramic disk
C4 - 0.1μF ceramic disk
XTAL1 - 3.57MHz crystal
XTAL2 - 12MHz crystal
S1 - Push-to-on switch
M1, M2 - 6V, 50-rpm geared DC motor
Batt. - 6V, 4.5Ah battery
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can an iPhone work as a receiver ?

can an iPhone work as a receiver ?

GouravS27 days ago
Where i can buy Motor M1 and M2 in india . plz reply ...
Avadhut.Deshmukh (author)  GouravS27 days ago

GouravS27 days ago
Where i can buy Motor M1 and M2 in india . plz reply ...
GouravS27 days ago
Where i can buy Motor M1 and M2 in india . plz reply ...
vaidya2 years ago
how to connect ear phone with it???which wire we should give to the input dtmf decoder ... and which should be grounded????
Avadhut.Deshmukh (author)  vaidya2 years ago
tip=tone and ring=GND

tip to green wire from jack and black to GND from Jack to connect ear phone done :)

do you have c language program for this project?

What are the components and circuit required to the this same project with atmega8 microcontroller???

AbhishekS45 months ago

yaar any body has the program & p.c.b layout of this project plz send me on plzz urgent help

gsandhu28 months ago

I’m working on a project which is about making a rescue
robot . I have struggling with it for 4 months and now all the mechanical works
had been done . but I’m facing difficulty in make the robot to work with rf
module can u plzz help me…

I want make transmitter and receiver that can control the
motion…I mean that receiver should have control 8 dc gear motor and each dc
motor should have a forward and backward botton to control the motion ……can u
kindly help me with this project ….if u can make the circuit board diagram for
the PCB ….or any other suggestion plz reply……mail me at “”

chatsbk0078 months ago

Was this Atmega 16 used SPI or Uart for communicatn with DTMF

KIRAN1961 year ago



gurek00011 year ago
thanku for the project i question sir, will this microcontroller n devlopment board do it-

gurek00011 year ago
hey buddy
well thanks
where did u got the wheels about 1/2" thick???
how should i increase it's speed???

please suggest me the components required.
So it means it will work....
Will this work with a 4*4 matrix keypad which produces same frequencies that mobile produces.
maroofs1 year ago
i want to make this robot, can u please guide me in detail.?
aaaooo602 years ago
can you tell me how to interface serial ttl gsm modem with dtmf decoder instant of cell phone
niel9992 years ago
any one would be kind enough to help me with designing a obstacle detector with this cell phone operated robot would be a big help
fendrigol2 years ago
can get the coding for my last project , please
Avadhut.Deshmukh (author)  fendrigol2 years ago

you can download
papo21102 years ago
sasi bindu2 years ago
which cell phone model i can use sir?.how to know a cell phone is working with DTMF or not?
Avadhut.Deshmukh (author)  sasi bindu2 years ago
only nokia old !

samsung not working !
Chebog2 years ago
Sir, Good day, I'm going to ask if where do i put the separate voltage for the MT8870 decoder IC? and can you please guide me in how to mount the earplug to the circuit?
(removed by author or community request)
6v only without voltage regulator !
(removed by author or community request)
Without burn ! only 6v !
supri3 years ago
are u use voltage regulator and why u use it......and where.....
Avadhut.Deshmukh (author)  supri2 years ago
only 6v !
Avadhut.Deshmukh (author)  supri3 years ago
(removed by author or community request)
where did you get the atmega in india
Avadhut.Deshmukh (author)  robot13983 years ago
Atmega16 it is widely available everywhere !
and the programmer
6v only without voltage regulator
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