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Make a remote controlled camera from a cellphone!by tanntraad on November 27, 2007

Table of Contents

Make a remote controlled camera from a cellphone! ....................................................................................

Intro: Make a remote controlled camera from a cellphone! ............................................................................

Step 1: Parts and tools you need ...............................................................................................

Step 2: Making it ...........................................................................................................

Step 3: The code ...........................................................................................................

File Downloads ...........................................................................................................

Step 4: Relays ............................................................................................................

Step 5: The result ..........................................................................................................

Related Instructables ........................................................................................................

Comments ................................................................................................................

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Intro: Make a remote controlled camera from a cellphone!Want to know what your cat is doing while at work? Send a text message to your newly made surveillance-cellphone and receive pictures and videos seconds later.Sounds like a dream? Not any more!

This video explains how it works:

Image Notes1. Relays2. Relay3. This LED blinks when in standby

4. Behind black tape: photoresistor and LED connected to phone's speaker.5. Bundle of joy6. Microcontroller7. Reset switch8. Phone

Step 1:Parts and tools you needA brave camera-cellphone (including SIM-card). I'm currently using a Sony Ericsson T630.A microcontroller (I use a Picaxe 18x)Solenoid relaysPhotoresistor (LDR)LEDA few resistors might come in handyWiresSoldering ironSolder, cutters, tape etc.

Oh, and another working cellphone.

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Step 2:Making itThe idea is to replace your fingers with the relays and your brain wi th a microcontroller. Depending on how complex your phone is, i.e. number of different keys to presin order to send a picture, choose your microcontroller accordingly.

My setup uses four outputs (four different keys on the phone) and one input on the microcontroller. It allows me to send a SMS text message (or call) to my hacked phand it then cycles through the code, clicking its way through the menus, taking photos and returning them to me.

I was optimistic about the joystick and quickly soldered up the wires. The joystick has up, down, left, right and center as possible connections. I had to crack open anojoystick to figure out the connections. "Making a "right" or "left" requires many different pins to be connected in a certain manner and order, e.g;

""Right;""First; yellow + black + blue + brownthen; purple + orange

I experimented and found that I could rationalize by always keeping some wires connected. This worked but made the joystick on the phone immobilized. For "Right" Iended up using two relays:

on relay 2on relay 1pauseoff relay 1off relay 2Relay no.1 is the top left button on the key pad ("Select" and "capture"). Relay no.3 is the top right button on the key pad ( "more" and "send").

Image Notes1. I soldered wires directly to the joystick

Image Notes1. This is what your looking for.

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Image Notes1. Soldering the wires on the keypad

Image Notes1. Relays2. Relay3. This LED blinks when in standby4. Behind black tape: photoresistor and LED connected to phone's speaker.5. Bundle of joy6. Microcontroller7. Reset switch8. Phone

Step 3:The codeThis is actually my first project involving a microcontroller. I recently acquired the Picaxe Experimenter board (and USB Programming Cable ) and I would highlyrecommend it for those interested in learning about micros.

Let it be said; I'm a terrible coder and there are thousands of ways to do this better. The code is ugly but but it works and can be snatched below.

The red standby-Led helps in confirming that the program is running:

standby:

high 5pause 100low 5pause 300goto main

When a text or call is received a LED connected to the speaker output shines onto the LDR (light dependent resistor). The value is then read:

readadc 2,b0

if b0 < 90 then standby

if b0 > 90 then run

The start of the "run" command:

run:

wait 2

high 3pause 100low 3pause 400

wait 6

high 1pause 100low 1pause 300

high 2high 1pause 100low 1low 2pause 300

http://www.sparkfun.com/commerce/product_info.php?products_id=8312http://www.sparkfun.com/commerce/product_info.php?products_id=8322

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File Downloads

Code.txt (2 KB)[NOTE: When saving, if you see .tmp as the file ext, rename it to 'Code.txt']

Step 4:RelaysWhy do I use relays? Well, I tried using transistors but my phone was so sensitive to stray voltages that I quickly opted for relays.

The relays are actually great for this project because they give you a visual and audible confirmation at each step as the code is running. Another great advantage is tfact that you can interact directly by just tapping them. And besides, they look amazing don't they?

Image Notes1. I snipped off the middle spring to make this 12V relay work on 5V

Step 5:The resultThe surveillance-phone works like a charm and there's no end to the possibilities of this device. I plan to monitor my dorm while away for the holidays.

Please don't forget to rate me and be sure to visit my other Instructables!

Have fun!

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Comments

50 comments Add Comment view all 131 commen

ilpug says: Mar 16, 2011. 9:56 AM REPlooks like a bomb though, but nice build.

ciochinda says: Feb 1, 2011. 3:01 AM REPHy guys! I'm from Romania (Europe)- i'm new here (in fact i just signed up, because i had an similar ideea and i just had to tell it to somebody)- I have got no electronic knowlege, but I had another ideea for this rig (and I say it's much smaler and kuicker to build)- but i got to say i never tried to build it (is just an ideea)- its probably more expensive (the phones i mean) but they both are perfectly usable (you don't mess with them in almost any way)

what you need:- 2 phones (both newer models with 3G network (with video call available) - one electric motor- one light sensor (posible from a solar garden lamp)- a carboard box (around the phone and everithing ealse - exept for a little hole for the camera, ofcorse)->for the power to the motor - you can use any old phone charger (or other tipe of ellectric power transformer)

-how does it work :-first everithing must be in a box to be totaly dark inside

- when the phone receives the video call, -> the screen lights up-> the sensor sees the light and activates the motor-> which tries to spin, but it only pushes a little bit the little solid metal bar -> which puches the answer button-> and you stick the box where ever you want the phone insaid to see (and show you)

- OK - how you build it - that's for everyone imagination to change- you buy a solar garden lamp (probably 1-2 $ ) - they all have a light sensor - you soulda little electric motor to the terminals that lights up the LED (in the night time) [the thing is (and i don't konw exacly how it works) you will have to soldercontacts inversed - or inver the contacts to the light sensor] - i don't know for sure - but you need the sensor to start the engine when is light not when is da(as it does normaly) - and then you soulder again some kind of little stick (bar) of metal - to the head of the motor and positioned straight to the anseringbutton of the phone (in order to push the button when the motor tries to spin) - and thats the more complicated part - - now you will have to place the holephone in an perfectly light sealed carboard box (with the execpt of the l ittle camera, which needs to see outside ofcorse -you make the configuration to 3Gnetwork for both phones - in order to have a video call betwen them -how does it work - when the phone receives the video call, -> the screen lights up -> tsensor sees the light and activates the motor -> whic tries to spin, but it only pushes a little bit the little solid metal bar -> which puches the answer button

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gary.kam says: Jan 2, 2011. 2:56 AM REPcan u plz mail me i ts schematics on (kam_gary@yahoo.co.in)plz.....regards

Ral6639 says: Sep 18, 2010. 10:16 AM REPHas anyone had any luck using the usb port on the mobile phone to communicate serial codes from the microprocessor? just a thought to clean up thedesign....

monishgogri says: Sep 7, 2010. 5:32 AM REPhi dude, i think u'r a genius, cud u just help me out, i got a prob wid ma bb 8900, d speaker doesnt ring

tanntraad says: Sep 7, 2010. 1:48 PM REPSorry, can't know for sure. Need more info. Maybe you should try the forums?

monishgogri says: Sep 8, 2010. 2:01 AM REPthnxx dude,u noe mobile repairing??

agis68 says: Sep 6, 2010. 2:32 AM REPWhere u got these relays????plz tell me

tanntraadsays: Sep 7, 2010. 1:43 PM REP

I got i from a shop here in Norway. It's a normal 12V relay. It was the ones I got at hand and they work great. You might have to adjust/ loosen the sprina bit as the micro controller only outputs 5V. You can get those where they sell car parts.The best thing would be to get some 5V relays. Here's one:http://www.sparkfun.com/commerce/product_info.php?products_id=100

bk-paradox says: Sep 1, 2010. 6:12 AM REPYou can use a mosfet instead of the relays if you wanted to make it smaller. When the mosfet is on it is considered shorted with 1 ohm generally resistancetransistor wouldn't work due to current needing to flow. I like this concept alot.. taking existing hardware and modifying it for a new project. Lots of cheapcellphones around for projects like these. Thanks for the inspiration

tanntraad says: Sep 2, 2010. 10:13 AM REPWill give those mosfet's a go. I had some problems with the key pad matrix since you can't have a common ground.

bk-paradox says: Sep 3, 2010. 1:17 AM REPThe way the keypad matrix work is just shorting the 2 pads together using graphite which is in the key.. so by soldering a wire to each pad and thenconnecting one wire to drain the other to source.. applying voltage to the gate of an N channel enhanced mosfet will then connect the two pads ^_^hope it works for you. Haven't done it for cellphones but have done similar for other projects

tanntraad says: Sep 3, 2010. 1:15 PM REPIt's a bit more complex than that on the phones I've been working on. The Nokia I'm working on now (old 3310) has 5 negative and 4 positive rain the matrix. This gives up to 20 different keys, the Nokia has 16. E.g. connecting two or more negative rails together won't work. I think theremust be some kind of pulsed/ switched mode matrix. Any info is welcome!

bk-paradox says: Sep 3, 2010. 9:43 PM REPHow do you think it detects the key press it connects 2 pads or columns and rows.You are talking about DTMF keypad most likely Basically you have 4 rows and 4 columns (3 columns for a standard phone 4 for a test phonand each one produces a frequency so when you press 1 you get a tone of 697 Hz mixed with 1209 Hz which tells the controller that youpressed that button.. So with 7 pins you can control the whole keypad or just send a tone using an ic which would be another viable optiona pic of a dtmf decoderhttp://www.afiata.com/wp-content/uploads/2010/03/DTMF.gif

Hope this is the same as you are talking about?Buy a keypad from an electronic store and see how it detects a press ^_^

tanntraad says: Sep 4, 2010. 12:17 PM REPSome more info on the phone;On the 3310, each pad consists of a ring with a dot in the middle. It's got 4 rails of positive rings(lets call them columns from A to D), andrails of negative center dots (rows from E to I).

Connecting any column with any row produces a single unique value e.g."7" or "Menu" or "Arrow up". This I have tested. Any keystrokecan be replicated by combining a column and a row.

Connecting two negative rails and one positive rail will NOT work and no value will be produced. This is why transistors have failed.Measuring with a multimeter shows equal potential between all pos. and neg.

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Without an oscilloscope I can not be sure, but I suspect a pulsed mode matrix. The concept is this;

Column A, B, C, and D are switched on and off sequentially. For each column, every row (E, F, G, H, I) is switched on and off in the samway.

For example;

Column B: ON Row E ON Row E OFF Row F ON Row F OFF ... ...etc....Column B OFF

This looping must of course occur very fast as not to miss any key strokes. Will try to use a micro with A, B, C, D as inputs and E, F, G,

I, as outputs. The micro will then only turn on E to I when the appropriate input is on. Basically I don't know what kind of matrix this is buI'll try to find out.A regular keypad (like the one I'm holding in my hand now, http://www.acroname.com/robotics/parts/R257-3X4-KEYPAD.html ) can beused in MANY different ways including DTMF, resistive, pulsed, or by using diodes.

tanntraad says: Sep 4, 2010. 12:13 PM REPSome more info on the phone; On the 3310, each pad consists of a ring with a dot in the middle. It's got 4 rails of positive rings(lets callthem columns from A to D), and 5 rails of negative center dots (rows from E to I). Connecting any column with any row produces a singlunique value e.g."7" or "Menu" or "Arrow up". This I have tested. Any keystroke can be replicated by combining a column and a row.Connecting two negative rails and one positive rail will NOT work and no value will be produced. This is why transistors have failed.Measuring with a multimeter shows equal potential between all pos. and neg. Without an oscilloscope I can not be sure, but I suspect apulsed mode matrix. The concept is this; Column A, B, C, and D are switched on and off sequentially. For each column, every row (E, FG, H, I) is switched on and off in the same way. For example; Column B: ON Row E ON Row E OFF Row F ON Row F OFF ... ...etc....Column B OFF This looping must of course occur very fast as not to miss any key strokes. Will try to use a micro with A, B, C, D as inpuand E, F, G, H, I, as outputs. The micro will then only turn on E to I when the appropriate input is on. Basically I don't know what kind ofmatrix this is but I'll try to find out. A regular keypad (like the one I'm holding in my hand now,

http://www.acroname.com/robotics/parts/R257-3X4-KEYPAD.html ) can be used in MANY different ways including DTMF, resistive,pulsed, or by using diodes.

bk-paradox says: Sep 4, 2010. 4:55 PM REPan npn or pnp would fail because you need current flowing in order to use it as a switch which means the emiiter would have to beconnected to ground so current can flow An enhanced mosfet on the other hand only requires a potential difference e.g. voltagepotential to switch Have a look at the keypad matrix below it is from 3310. I think you got yourself confused.it's pretty standard Got tokeep in mind all you do when you press any button is connect things together don't see how you can make it more complicated. butthats just my 2 cents.

tanntraad says: Sep 4, 2010. 5:50 PM REPThanks for the image! You got a lager one or a link maybe? Can't really tell out the details from that one:) Still haven't tried themosfet's but I'm going to. Can you advise me (with a schematic) on how to connect them? I just can't see how i t would work butmaybe I'm missing something:)Is this the kind?http://upload.wikimedia.org/wikipedia/en/7/7b/Enhancement-MOSFET-symbols.png

tanntraad says: Sep 4, 2010. 6:20 PM REPNote to my image: The micro can be powered by the phone's battery if needed. Using one transistor on a single key worksgreat but the real problem arises when you connect two or more keys. I really hope you could advise me on how to connectthe MOSFET's as I can't figure out how to avoid mixing up the matrix.

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tanntraad says: Sep 4, 2010. 7:07 PM REPI found that schematic on http://www.anysvc.net/downloadcenter/down/200509/20050916180492.pdf I snippet out asection where the diodes are. It's too late (4 AM here) for me to test now but think I'm on to something. I suspected diodesomewhere but didn't know where (hard to measure "in the blind"). I made a diagram last week from the reverseengineering and it matches (except the diodes ). Will post my findings tomorrow.

bk-paradox says: Sep 4, 2010. 8:13 PM REPGood to see you are a searcher ^_^There are two ways to tackle this as I said before one is mosfet directly on the keys the other is an IC such as thepicaxe feeding the key information to the phone.here is the sample of the mosfet schematics.Obviously not a full circuit.

When you set the pin high the button is pressed i.e the row and column are connected :)

If you put some logic probes on the rows and columns you can emulate the same on a picaxe or similarmicrocontroller.

tanntraad says: Sep 5, 2010. 3:31 AM REPThanks for the reply:) ..But I think you might be misunderstanding my problem. I'm very familiar with the basics of

electronics, and then some. My real problem is connecting MORE than one transistor/ Mosfet. According to yourpicture, a potensial is applied to the gate and source. This is fine for one mosfet and it wi ll work. Now, when you'vgot two mosfet's, the problem is that Source on both is connected to ground. The mosfet's will work just fine but tmatrix is lost. Separating the ground is key to making this work. Now, thanks to you pointing me to that Nokiaschematic I think the solution is as simple as adding a few diodes (source to ground). Will try it as soon as possibAlso from the schematic it is clear that it is not a pulsed matrix but rather a set of diodes separating what they labas rows. I really need to get an oscilloscope at home, but then again, reverse engineering can be fun also :)

bk-paradox says: Sep 5, 2010. 2:24 PM REPCould I then suggest 1 alot more elegant approach just use 1 chip directly connected to the columns and rowand using an oscilloscope which you can use your soundcard for (cheap but effective sometimes) and work othe signalling.I would make a bold assumption and say it is dtmf because it's a phone. So then a picaxe to send that freqshould work and would be very small indeed. Just got to make sure you have the right logic levels etc.I think we both misunderstood each other lol ^_^look forward to seeing what you come up with, as I'm overseas atm and can't do my own write up.

tanntraad says: Sep 5, 2010. 3:02 PM REPThat's my next step. Those diodes bug me. At the moment I can't see any other solution than emulating.That, or going back to relays. They are bulky but they sure work flawlessly every time ;)

bk-paradox says: Sep 5, 2010. 6:46 PM REPCan you upload your schematic please..

tanntraad says: Sep 6, 2010. 2:29 PM REPAre you thinking about the 3310 or the SE in the instructables? I don't have the schematic for the Sbut it is pretty strait forward. When I succeed with the Nokia, I'll post the schematics for sure:)

PS; I tried an audio card oscilloscope but it was too much noise to pick up anything..

bk-paradox says: Sep 6, 2010. 4:33 PM REPAlready got the 3310 was talking about the instructable..Was going to copy your schematic and port it to the mosfet so you can seehow a mosfet can replace a relay but meh..

tanntraad says: Sep 7, 2010. 12:55 AM REPThat would be awesome. As far as I remember, the SE worked in the same way. neverscoped it either but it wouldn't be required if you went with mosfets. Can you do a quickschematic? E.g four buttons, maybe spanning across three rows and four columns orsomething like that. I'd really appreciate it! Would save me a lot of time. I guess you'replanning on using diodes also?

The best would be if the micro and phone had their separate batteries(so one can adopt thschematic into other projects without worrying about different voltages) but I don't know ifthat works? I can give you a general schematic on how I interface with relays; (I did it like

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that so that others can join in on the discussion if they want:) )

bk-paradox says: Sep 7, 2010. 2:54 AM REPThats what I figured it would be...

Here is an image I found which shows what I was trying to say unsuccessfully

You can drive the mosfet with the logic level of a picaxe just got to read thedata sheet

tanntraad says: Sep 7, 2010. 12:31 PM REPGreat picture! Here's one more of my reallybad MSpaint pictures;) Is this whatyou're thinking?

bk-paradox says: Sep 7, 2010. 6:46 PM REPthey can share a common source that won't affect it at all.Especially seeing as how you can only press one button at a time.It acts exactly as a relay but instead of being open it just has a ridiculously highimpedance which for all intensive purposes is open.

Try it out with 1 button then chuck in the other should work fine.

I don't see trouble with it at all.

Really wish I was home at my workbench >_< lol

If you want I can find a suitable mosfet for this purpose

Would love to see this in smd form would be impresive could fit in the battery

compartment and would be for all purposes just a phone to any1 seeing it

tanntraad says: Sep 8, 2010. 2:25 AM REPAs I've said before, the mosfet's will work but the key pad will not. Addingdiodes might work..

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bk-paradox says: Sep 8, 2010. 4:54 AM REPAhhh I see I did say common source >_< my mistake your fault lol :)

tanntraad says: Sep 8, 2010. 5:31 AM REPSo, does anyone have a solution for this problem? Maybe I should da post in the forums..

bk-paradox says: Sep 8, 2010. 8:24 PM REPYou've confused your diagram..if you look at the relay your coil has a common source..A mosfet doesn't need that.. as it only had 3 inputs not 4I guess you are a picture person so here you go

tanntraad says: Sep 9, 2010. 1:44 AM REPNo I haven't.I drew it like that so others could see the consept. I can drawin the symbols for mosfets but it will still be exactly the same

Again; you need to draw the COMPLETE schematic. You aonly drawing the POSITIVE output on the microcontroller. Thmicrocontroller has a negative (ground) right? Draw it in! Th

you'll see. Remember that you'll have to have a potentialdifference to turn the mosfet on. That means that the positivoutput has to have a negative somewhere.

Also what you have there on the right is just two simpleswitches. That's easy and everybody agrees that just turningon some switches is easy . you need to draw a MATRIX ofswitches. Then you'll have a problem.I'll try again:

tanntraad says: Sep 9, 2010. 1:51 AM REP

Note how I drew in the negative ground (GND). I think this where you got confused (a lot of people forget theground). You can also do like I did in the last picture andjust connect them all together . This is easier for peoplewho is not used to reading schematics.

bk-paradox says: Sep 9, 2010. 4:17 AM REPVoltage potential can be determined purely by themicroControllerThe source does not need the ground.

E.g. you go high on a port you have a potential of 5vyou go low on a port you have a potential of 0v.

The way a mosfet works is based on this. in this casethe gate when you apply a positve charge in the cas

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of an enhance N-channel mosfet a negative chargebuilds up on the p junction thus allowing electrons toflow from drain to source.

You do not need a path to ground to get this potentia

Should check out how potential energy works

tanntraad says: Sep 9, 2010. 6:16 ASorry but that is just plain wrong. A potential is adifference in charge between two points.

You said;"E.g. you go high on a port you have a potential o

How do you then measure the potential (e.g. withmultimeter)? Where do you put the TWO probesthe output, the other?? The answer is of course tground.

I do think

I do have several courses courses in physics,electrochemistry and electronics at university levnot claim to know it all but I think I am on firm grohere. No pun intended.

Some links:http://www.physicsclassroom.com/class/circuits/uhttp://www.electronics-tutorials.ws/resistor/res_6

bk-paradoxsays:

Sep 9, 2010. 4:14 PM REP

In this case the traces on the keyboard providthe path to the dtmf decoder inside thattransistor is a ground.

The beauty of Integrated circuits is that theground/ref is built into the chip.therefore you do not need your own ground.

But yeah im back home in 10 weeks I will jusmake it and write an instructablecredit you with the initial idea.ciao

tanntraad says:

Sep 10, 2010. 3:19 AM REP

But can youanswer the simple question -where to measure gate potential?

Would love to see what you can do withthis. I do think mosfet's are the best way go provided additional components (diodmaybe) are added. Maybe even betterwould be opto-isolated mosfets.

I thank you for the very promt and gooddiscussion :) Heck, I'll give you a patch!

bk-

paradox says:

Sep 10, 2010. 5:07 AM REP

Haha I got to frame my answers bette^_^ you taught me that

follow the traces the keypadsthemselves goto a decoder chip.get the chips data sheet use thatground or even the connection fromsource to middle of the pad.

On the 3310 schematics.col 0:4 come out of the main IC and r0:4 come into it.Therefore making a loop. most likely 0:4 send out a high and row 0:4 readthe value in and check if a loop hasbeen made.So the main IC the mad2dw1_rom6chip is where you want to test the

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mosfeton the row side... as that would be yoconnection to ground.Hope thats a well thought out answerfor you lol...

Next time I will not leave so many holin my replies created alot of confusion

Thanks for the discussion helped meflesh out my plans anyway :)

jabbawokie says: Sep 1, 2010. 3:53 PM REP

i agree. its nice to see it working,(i like to see moving bits and flashing lights lol) but nice work i think i will start building this. thanks

Patented says: Apr 10, 2010. 2:37 PM REPThis is awesome, im planning to try making one but a little easier than that( with like servos and RC stuff )

Thank you !

Colonel88 says: Oct 17, 2009. 5:25 AM REPI found a cell phone in those "Cell-phone recycling centers" boxes. The camera works but if i call the number some old guy answers. Any other way tocontrol the cam remotely but WITHOUT using the phone itself? Thanks in advance. Oh and by the was, what is the best microcontroller to get? Its eithergoing to be a BASIC Stamp or an Arduino. I wana get one so bad....

davidson12 says: Oct 6, 2009. 1:48 PM REPPlease sir, please can you send me a copy of the schematics to my mail. It is meggyone@yahoo.com. I would be very grateful since I have to present a

report in a few days time.

jirtan says: Dec 1, 2007. 1:15 PM REPIt'd be better if schematics and the code for the picaxe was given, but it's a cool idea. I assume the picaxe is notified by a rerouted phone's speaker?

tanntraad says: Dec 1, 2007. 4:22 PM REPI can post the schematics if you like. The reason I didn't was that it would only count for that specific phone and microcontroller. The input to themicrocontroller is done by adding a LED to the speaker output and coupling it to a photo resistor (see picture).

culepet says: Aug 24, 2009. 8:06 PM REPpost the schematic plsssss :{

masterme120 says: Dec 8, 2007. 7:32 AM REPI was wondering about that. Why didn't you just hook up a capacitor to the speaker wires and then to the microcontroller?

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