hello guys,
i have a project and i need to know if i am supplying the arduino and the circuit with the right power ?
for the record i never worked with arduino and external power from batteries !! i always used it with usb since i started a month ago so i need please some guidance with this
check the attached file
and thanks for all in advance 
Picture is too big, can't scroll around enough to take it all in without losing access to the scroll bars.
CrossRoads:
Picture is too big, can't scroll around enough to take it all in without losing access to the scroll bars.
ok I changed it
That is a good way to destroy your adruino.
You have 12V connected to the LEDs and on to the arduino. Do not do this as it exposes the arduino's output to greater than the supply rail.
Grumpy_Mike:
That is a good way to destroy your adruino.
You have 12V connected to the LEDs and on to the arduino. Do not do this as it exposes the arduino's output to greater than the supply rail.
aha ok than how should i power all the circuit ? i guess not from 5V of arduino !! cz i need about 12V for a big DC motor for a racing car
so what should i do ?
and btw arduino can support more than 500mA ? does the current matters or the voltage has the biggest influence on aruino ?
Is that a motor a pot or a servo bellow the bat's in your drawing?
Mark
I am not sure you have got the hang of what you are doing. The LEDs if connected directly to the arduino pins should not be powered by more than 5V. If you want to connect the LEDs to 5V you have to switch them through a transistor.
and btw arduino can support more than 500mA
Do you mean the current you can draw from the 5V pin on an arduino?
If from the USB then 500mA is the limit the USB can supply.
If from the regulator then it depends on the voltage of the input because the difference between the input voltage and output voltage is burnt off as heat. And the heat dissipation is what limits you.
does the current matters or the voltage has the biggest influence on aruino ?
Exceed either and your arduino is toast.
If that is a pot in the lower left then that will expose the analogue input to greater than 5V and burn it out also.
If that is a pot in the lower left then that will expose the analogue input to greater than 5V and burn it out also.
If its a motor then you need a drive transistor and a diode, if its a servo why a you trying to control it from an analog pin?
Mark
holmes4:
If that is a pot in the lower left then that will expose the analogue input to greater than 5V and burn it out also.
If its a motor then you need a drive transistor and a diode, if its a servo why a you trying to control it from an analog pin?
Mark
it's a pot.
well i need to know if i am working with an RC car, so i put the receiver circuit for another arduino in the car and i need to give it a power .
Originally the car use the be supplied with 12V batteries set, but i took off everything from it and i am building my own circuit leaving the motors of the car and working with them, so i need to supply the car with a 12V batteries !! how can i do that ? it should be like the picture i posted it ?
it should be like the picture i posted it ?
What is that final it about?
Basically no.
You can control a 12V motor from a 5V arduino, the point is you must not let the 12V into your arduino like you have it.
Have a look at:-
http://www.thebox.myzen.co.uk/Workshop/Motors_1.html
It shows many ways of controlling a motor with a higher voltage than the arduino. Do you need to change the motor's direction? If so you need a H-bridge circuit.
well yea i need to change it 2 but that's not a problem to me
so you suggest i just put a 6V battery to my arduino and a resistor of course to get down to 5V and supply the whole circuit with it ? using transistor and others for amplifying ?
and thanks a lot i saved the link and i am gonna look at it
so you suggest i just put a 6V battery to my arduino and a resistor of course to get down to 5V and supply
No!!!
Who remotely suggested that? That is very bad and will not work.
Grumpy_Mike:
so you suggest i just put a 6V battery to my arduino and a resistor of course to get down to 5V and supply
No!!!
Who remotely suggested that? That is very bad and will not work.
what should I do then 
?
excuse my bit of dumb lol but i am still a beginner in electronics, i have other programming skills which helped in leanring but not much of electronics theories 
what should I do then
For what?
Your questions are all over the place and you keep changing what you are asking.
Grumpy_Mike:
what should I do then
For what?
Your questions are all over the place and you keep changing what you are asking.
ok i need to know how to give power to make a circuit work
let's say i am building an RC car, when we buy one we see it has a place for batteries that supply everything
so this is my question i need to supply the circuit of this RC car with batteries, so i thought about the 12V set of batteries (8 x AA 1.5V)
so i was asking if that is right or it will destroy my arduino and other
and your answer was it will destroy, so can you please give me a solution about how to give arduino and all the circuit power using batteries of course ?
Basically you feed your car with 12V. Then you can put that same 12V into the power jack of your arduino.
Then any LEDs you want to drive or pots you want to look at are all wired to the +5V pin of the arduino.
You then need a driver circuit to let your arduino switch the car's motors. This can be a simple transistor in the case of a motor only requiring to go one way or if it needs to go both ways you need a circuit called a H-bridge.
You can buy these as motor drivers or motor shields or as individual chips like the L298 or the SN754410.
Grumpy_Mike:
Basically you feed your car with 12V. Then you can put that same 12V into the power jack of your arduino.
Then any LEDs you want to drive or pots you want to look at are all wired to the +5V pin of the arduino.
You then need a driver circuit to let your arduino switch the car's motors. This can be a simple transistor in the case of a motor only requiring to go one way or if it needs to go both ways you need a circuit called a H-bridge.
You can buy these as motor drivers or motor shields or as individual chips like the L298 or the SN754410.
aha great so about 12V i was told that if i wired in to arduino with the jack connector i would destroy my arduino because it can be suppplied with 5V from the USB
if that's right so how can i solve that problem ?
i was told that if i wired in to arduino with the jack connector i would destroy my arduino because it can be suppplied with 5V from the USB
No that is not a correct understandng of he situation.
The arduino has a circuit that switches the power between that of the external input and that from the USB. This happens automatically.
aha ok got it, but when i put a transistor for the motor to amplify, so the dc motor will be getting anything near 12V ?
excuse my dummy question
firashelou:
aha ok got it, but when i put a transistor for the motor to amplify, so the dc motor will be getting anything near 12V ?
excuse my dummy question
Sorry I don't understand that question.
You will loose 0.7V across the transistor but apart from that you can switch the full 12V. Various H-bridge circuits can loose between 3V and 0V depending on how they are made. Look for one made from FETs, they tend to loose less than the one made with transistors.
