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Topic: Relay problem (Read 97 times) previous topic - next topic

jgkad

hi, i have an "active low" low relay, and i use pin 12,

my question is about the consuption of nano arduino board to has the pin 12 always with 5 volts "high"

my project is every 1h to open something every day for 5 sec

i think a relay high is most suitable for my project. or not?

about energy is my question, (miliampers) 
thanks


UKHeliBob

Split from an old topic
Please do not send me PMs asking for help.  Post in the forum then everyone will benefit from seeing the questions and answers.

Wawa

#2
Jun 12, 2020, 11:41 am Last Edit: Jun 12, 2020, 11:42 am by Wawa
hi, i have an "active low" low relay, and i use pin 12,

my question is about the consuption of nano arduino board to has the pin 12 always with 5 volts "high"
Current flow depends on what's connected to the pin, not on the high/low pin state.

The opto LED of a common opto-isolated relay board is connected between VCC (5volt) and the Arduino pin,
meaning that 2mA LED current will flow when the pin is low (relay 'on'),
and no current will flow when the pin is high (relay off).
Leo..

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