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Author Topic: ARDUINO MEGA (Vin current, question)  (Read 293 times)
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I'm currently using Arduino MEGA for a project in university,
it requires for me to drive a motor with a maximum current load of 1.6A
(for that I'm using LM293 as driver, not sure if it is relevant)
Can I draw that current from the Vin pin? The power supply I'm using
can go up to 3A.

Thank you, very much,

Francisco Dias
« Last Edit: January 16, 2013, 09:29:47 am by xykudyax » Logged

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I'm currently using Arduino MEGA for a project in university,
it requires for me to drive a motor with a maximum current load of 1.6A
(for that I'm using LM293 as driver, not sure if it is relevant)
Can I draw that current from the Vin pin? The power supply I'm using
can go up to 3A.

Thank you, very much,

Francisco Dias

 There is a series polarity protection diode rated for 1 amp between the external DC power connector and the Vin pin so trying to draw 3 amps from your power supply that way will not work. You will need to tap into your external power upstream of the arduino DC power connector. Even it there was not that diode drawing 3 amps from the circuit traces and shield connector pin would be really stretching it.

Lefty

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No you didn't understand the power supply can handle the 3A, but I only need 1,6A maximum.
What do you think? Would it be better to supply the driver independently?
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YES the issue is the series diodes rating of 1A and the pin connected to Vin isn't capable of 1.6 A. Use a separate PSU and don't forget to connect the grounds together.

Bob
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