ARDUINO UNO DTMF BASED CAR GPS TRACKER

I think this will be the more reliable GPS car tracker , a cheap tracker which include a cheap old Nokia mobile Set N73 , any smart symbion mobile can be used ,
Main features are :
1). Get GPS coordinates any time you want.
2). Alert when some one open the Car door .
3). Can kill engine by specific key at once.
4). Can activate Car Horn while care hidden near by area.
4). confirmation received while car engine stopped by you.

PCB + Code will be shared soon
Initial codes below

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The initial codes can be used as a arduino DTMF interface project
where you can ON/ OFF a LED simply by giving DTMF tone to the arduino. All digital pins were used . LED will be on pin # 3
LED will be ON when 6 # DTMF code received , 4 bit Binary code of 6 # will be ( 0 1 1 0 ).

Updated Codes

60Vdc to 5Vdc Convertor ( 60 VDC TO 40 VDC input)

If you want to try to convert high voltage DC to low level up to 5 V , it is hard to tackle such high volt pressure by the normal available regulator ICs in the market , like a  7805 IC which can be use up to 35 Vdc as a input, by increasing the said limit it will stop the output volts , other IC LM317 also have the same issue ,expensive kits or ICs are available in the market , but this circuit can be easily made from a ordinary components, in first circuit the voltage will be converted in the rang of 15 vdc by LM317  , then it is converted again by the 7805 IC for 5vdc output .  actually a high wattage resistor 330R 5W used first to limit the input voltage to for the general regulator ICs , the schematic & PCB designed in eagle CAD , 

SOLAR 12V DC DIMMER Simple

Below mention simple circuit can used as a dimmer in DC range , from  0 to 20 VDC, here a powerful FET were used to deliver much DC Amperes for the appliances ,this Circuit can be easily understand  where here we used only three basic  (3) parts ,FET gate were kept biased between +VE & -VE supply, 100 k were attached between gate & positive supply, on the other side a variable resistor ( 500 K ) were used ,as we know FET behave like a latched on nature , once Gate activated it will remain on until power to the whole circuit disconnected , this issue here can be settle by biasing gate with negative power supply , once FET off due to –VE biasing , it can be easily on by varying biasing between +VE supply , now here 500k can control the output  from the drain , output may be a DC fan , DC LED light , IRFP064N FET is a favorite choice for the normal use , but a good heat sink will be required for the FET to tolerate in high power mode,This circuit is good for specially the fans or the LEDs lights used direct from the solar plates from the roof top, at peak hours ( day time )  the Solar plates deceivers up to 13vdc to 17 vdc  it may cause damage the appliances , but using this circuit it can save the many of our household equipment  due to the voltages  

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