Hey guys,
I have got 4 Ultrasound sensors and 3 IR sensors. the Ultrasounds are connected via I2C bus. I want to connect these IR sensors.
I was wondering if that is okay to supply many devices such as those Ultrasound sensors, compass and 3 IR sensors from Arduino +5.
If that is not right way, can you please recommend and proper way ?
I appreciate your help
Regards
Farhad:
Hey guys,I have got 4 Ultrasound sensors and 3 IR sensors. the Ultrasounds are connected via I2C bus. I want to connect these IR sensors.
I was wondering if that is okay to supply many devices such as those Ultrasound sensors, compass and 3 IR sensors from Arduino +5.
If that is not right way, can you please recommend and proper way ?
I appreciate your help
Regards
It's not the number of things you wire up to use the 5v pin, but rather the total current those things require to operate. The arduino basic board consumes about 40ma or so. The max total current avalible is 500ma if using USB power, or possible a little more if using the arduino external power connector with an external 7-12vdc power module. If your total +5vdc current demand is higher then that then it possible to use an external higher current regulate +5vdc power supply to power your external components and also the arduino board itself if desired.
So the answer depends on what your total current demand is and how you are or want to power the arduino board. It's all about the details. 
Lefty
Lefty, Thank you very much for the reply,
I got your point, I didn't know that, Thank,
The Arduino board is powered by a 12 Battery.
Can you please tell me how to calculate the total current consumption and check if the Arduino is capable of powering all the devices connected to +5 pin.
The Arduino board is powered by a 12 Battery.
My wireless doorbell bell-push is powered by a 12 volt battery.
It is about half the length of an AA cell.
My car's starter motor is powered by a 12 volt battery.
Can you please tell me how to calculate the total current consumption and check if the Arduino is capable of powering all the devices connected to +5 pin.
I think you add together the milliamps needed for each device and if it is < 1 amp then it should work. Not sure though.
AWOL!
I just wrote to tell him that I am using external power supply, not the USB cable, anyway, I am experimenting with my first Arduino project.
Jaredpi, thanx for the reply,
Yea, I was thinking to find the current of each devices from their datasheets and sum them up, then compare to the total current of Arduino, as Lefty pointed that it could be greater than 500 mA if the Arduino is powered from external power supply.