Hello. If my components ( 7 gas sensors ) need around 750 mA, can i connect them to my Arduino and power it through the DC barrel jack? I know that the maximum current allowed through the barrel jack is 1 Amps , but I'm not sure if this is the good approach. My sensors require both 5 and 3.3V but i can use level converters for the 3.3V sensors.
The best approach is to power the gas sensors separately. Don't forget to connect all the grounds.
If you need regulated voltages, from say a 12V power adapter, Pololu has a great collection of small, very efficient step down modules. One 12V supply could be connected to several regulators, so that each MCU and sensor is supplied appropriately.
I might use a breadboard power supply to power the gas sensors from a 9V 1A ( i just need to find a good breadboard power supply board for my sensors that can support at least 800 mA) and power the arduino normaly ( through the usb B). And of course, common ground them sensors and arduino together. For the breadboard power supply, I thought about using somting like this but that has a maximum current of 800 mA
Breadboards are intended for temporary experiments with low voltage logic circuits, and cannot handle current over a couple hundred mA. The tracks burn and connections become extremely (rather than just moderately) unreliable.
For a project like this, use a servo power distribution PCB and solder the connections. You can make your own PCB from perfboard, or buy one.
Oh, alright, I will check that. But what about a arduino shield sensor?
Does that shield allow to power sensors separately from the Arduino?
Sorry, I meant this one. It has external power supply input.
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