Arduino Forum

Using Arduino => General Electronics => Topic started by: jgkad on Jun 12, 2020, 08:22 am

Title: Relay problem
Post by: jgkad on Jun 12, 2020, 08:22 am
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

Title: Re: Relay problem
Post by: UKHeliBob on Jun 12, 2020, 09:45 am
Split from an old topic
Title: Re: Relay problem
Post by: Wawa on Jun 12, 2020, 11:41 am
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..