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:
This video explains how it works:
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Signing UpStep 1: Parts and tools you need
A brave camera-cellphone (including SIM-card). I'm currently using a Sony Ericsson T630.
A microcontroller (I use a Picaxe 18x)
Solenoid relays
Photoresistor (LDR)
LED
A few resistors might come in handy
Wires
Soldering iron
Solder, cutters, tape etc.
Oh, and another working cellphone.
A microcontroller (I use a Picaxe 18x)
Solenoid relays
Photoresistor (LDR)
LED
A few resistors might come in handy
Wires
Soldering iron
Solder, cutters, tape etc.
Oh, and another working cellphone.
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you got the schmatic diagram for that,if you can send me pls this id,sasikumar1357@gmail.com
thanks
very nice kindly send me schmetic diagram ,than only i will try,nice consept, and how to program the programmble ic,and part list and all pls send me my e mail id .sasikumar1357@yahoo.co.in or sasikumar1357@gmail.com
i am exporting your reply i need to make project this nice consept
plssssssssssssssss.
haha
great one man.. keep this goin on and on and on...
- 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 soulder a 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 solder contacts 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 dark (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 ansering button 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 hole phone in an perfectly light sealed carboard box (with the execpt of the little camera, which needs to see outside ofcorse -you make the configuration to 3G network 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 -> the sensor 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
u noe mobile repairing??
The best thing would be to get some 5V relays. Here's one:
http://www.sparkfun.com/commerce/product_info.php?products_id=100
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 phone) and 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 you pressed 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 option
a pic of a dtmf decoder
http://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 ^_^
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), and 5 rails 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 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 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 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 inputs and 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 of matrix 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.
Is this the kind? http://upload.wikimedia.org/wikipedia/en/7/7b/Enhancement-MOSFET-symbols.png
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 the picaxe 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 similar microcontroller.
I would make a bold assumption and say it is dtmf because it's a phone. So then a picaxe to send that freq should 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.
PS; I tried an audio card oscilloscope but it was too much noise to pick up anything..
Was going to copy your schematic and port it to the mosfet so you can see
how a mosfet can replace a relay but meh..
The best would be if the micro and phone had their separate batteries(so one can adopt the schematic into other projects without worrying about different voltages) but I don't know if that works? I can give you a general schematic on how I interface with relays; (I did it like that so that others can join in on the discussion if they want:) )
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 the
data sheet
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 high
impedance 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
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 4
I guess you are a picture person so here you go
I drew it like that so others could see the consept. I can draw in the symbols for mosfets but it will still be exactly the same.
Again; you need to draw the COMPLETE schematic. You are only drawing the POSITIVE output on the microcontroller. The microcontroller has a negative (ground) right? Draw it in! Then you'll see. Remember that you'll have to have a potential difference to turn the mosfet on. That means that the positive output has to have a negative somewhere.
Also what you have there on the right is just two simple switches. That's easy and everybody agrees that just turning on some switches is easy . you need to draw a MATRIX of switches. Then you'll have a problem.
I'll try again:
The source does not need the ground.
E.g. you go high on a port you have a potential of 5v.
you go low on a port you have a potential of 0v.
The way a mosfet works is based on this. in this case the gate when you apply a positve charge in the case of an enhance N-channel mosfet a negative charge builds up on the p junction thus allowing electrons to flow from drain to source.
You do not need a path to ground to get this potential.
Should check out how potential energy works
You said;
"E.g. you go high on a port you have a potential of 5v."
How do you then measure the potential (e.g. with an multimeter)? Where do you put the TWO probes? One on the output, the other?? The answer is of course to the ground.
I do think
I do have several courses courses in physics, electrochemistry and electronics at university level. I do not claim to know it all but I think I am on firm ground here. No pun intended.
Some links:
http://www.physicsclassroom.com/class/circuits/u9l1c.cfm
http://www.electronics-tutorials.ws/resistor/res_6.html
The beauty of Integrated circuits is that the ground/ref is built into the chip.
therefore you do not need your own ground.
But yeah im back home in 10 weeks I will just make it and write an instructable
credit you with the initial idea.
ciao
Would love to see what you can do with this. I do think mosfet's are the best way to go provided additional components (diodes maybe) are added. Maybe even better would be opto-isolated mosfets.
I thank you for the very promt and good discussion :) Heck, I'll give you a patch!
follow the traces the keypads themselves goto a decoder chip.
get the chips data sheet use that ground or even the connection from source to middle of the pad.
On the 3310 schematics.
col 0:4 come out of the main IC and row 0:4 come into it.
Therefore making a loop. most likely col 0:4 send out a high and row 0:4 read the value in and check if a loop has been made.
So the main IC the mad2dw1_rom6 chip is where you want to test the mosfet
on the row side... as that would be your connection to ground.
Hope thats a well thought out answer for you lol...
Next time I will not leave so many holes in my replies created alot of confusion.
Thanks for the discussion helped me flesh out my plans anyway :)
Thank you !
http://www.radioshack.com/product/index.jsp?productId=2062480
Your help is appreciated too.
It's a big, detailed document. Some of the basic commands:
ATD - dial a number
AT+CMSS= - send predefined SMS
AT+CRSL - change ringer volume
Heaps of other cool stuff you can do; determine battery charge, signal strength, navigate to a web page over WAP...