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Arduino breadboard power supply

braedan

Hello, I have 37 sharp brand ir distance sensors hooked up to afew multiplexers connected to an breadboarded arduino uno. My problem is the sensors draw (on average) 30ma in short strong bursts and I also need to power the arduino and 3 multiplexers (CD74HC4067). How can I make or buy such a power supply???

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    Hi Braedan,

     

    It appears that your IR sensor if they all fired at the same time would take a little over an amp. The current draw of the Uno will top out at about 500 mA and the multiplexers will not draw much. To be safe you should have a power supply that can handle twice the max current draw of your circuit load. I would look for a 5 volt supply that is rated at 3 Amps. It will be important to have some decoupling capacitors so the the firing of the IR sensor doesn't create a problem for the Arduino. These can be a 100 uF 16 volt electrolytic and a 0.1 uF ceramic capacitor accross the power feed as close to the arduino as possible. 0.1 uF decoupling ceramic capacitors should also go between the Vdd and Ground on the multiplexers. This size power supply can be easily built if you are looking for an additional challenge. Check out as he has several blogs on the construction of power supplies.

     

    John

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  • 0

    Hi Braedan,

     

    It appears that your IR sensor if they all fired at the same time would take a little over an amp. The current draw of the Uno will top out at about 500 mA and the multiplexers will not draw much. To be safe you should have a power supply that can handle twice the max current draw of your circuit load. I would look for a 5 volt supply that is rated at 3 Amps. It will be important to have some decoupling capacitors so the the firing of the IR sensor doesn't create a problem for the Arduino. These can be a 100 uF 16 volt electrolytic and a 0.1 uF ceramic capacitor accross the power feed as close to the arduino as possible. 0.1 uF decoupling ceramic capacitors should also go between the Vdd and Ground on the multiplexers. This size power supply can be easily built if you are looking for an additional challenge. Check out as he has several blogs on the construction of power supplies.

     

    John

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