Hi all,
I searched the internet for a relay board which operates Active HIGH, instead of active LOW as most the relays have.
I found this one: http://www.ebay.com/itm/201315038108?_t ... EBIDX%3AIT
However, upon it's arrival noted that it only has VCC and ground, no JD-VCC.
My question: Can I connect an external power supply to VCC and ground and still use the RPi GPIO's to control the relays?
I have been told by the seller of the board that I can, without additional info.
So, does this make sense:
Rpi gnd to relay board ground
rpi Gpio to board input
External PS 5v to VCC
external ps gnd to board ground
And, if it does, would it be better to have the external PS 5V pos lead to the inputs of the relay board, interrupted by a 2N222 transistor, which is then fired up by the RPi GPIO output?
I am obviously not an electronic genious, so this may make no sense at all. I don't want to 'try and fry'
Rainer
I searched the internet for a relay board which operates Active HIGH, instead of active LOW as most the relays have.
I found this one: http://www.ebay.com/itm/201315038108?_t ... EBIDX%3AIT
However, upon it's arrival noted that it only has VCC and ground, no JD-VCC.
My question: Can I connect an external power supply to VCC and ground and still use the RPi GPIO's to control the relays?
I have been told by the seller of the board that I can, without additional info.
So, does this make sense:
Rpi gnd to relay board ground
rpi Gpio to board input
External PS 5v to VCC
external ps gnd to board ground
And, if it does, would it be better to have the external PS 5V pos lead to the inputs of the relay board, interrupted by a 2N222 transistor, which is then fired up by the RPi GPIO output?
I am obviously not an electronic genious, so this may make no sense at all. I don't want to 'try and fry'
Rainer