Increasing GPIO signal output voltage

Other Hardware General Electronics
1

What is the best way to increase the signal output voltage by ~1VDC? I have a signal output that is just shy of what my relay is expecting and it is giving erratic bahavior because of it

2

IF you're powering a relay from an Arduino output, that's your first problem, they're not capable of it.
What are the relay ratings?

3

Which relay, which Arduino.
I never heard of a relay module that didn't work with a 3.3volt or 5volt Arduino.

Yes, bare relays can't be powered from an Arduino pin.
Leo..

4

Is this part of this thread, really?

5

shoot i just noticed this is the arduino forum. anyway it's the ESP8266 NodeMCU DevKit 1.0 and the Songle SLA-05VDC-SL-C relay. coming out of GPIO5 to the signal input of the relay

6

You can't control a relay with an Arduino pin, but you can control a relay module with an Arduino pin. The relay module could have a 5volt songle relay on it, but which module do you have. Many modules can be controlled with a 3.3volt NodeMCU pin.
Post a picture or weblink of the relay module.
Leo..

7

I've asked for this to be merged with the other thread, it's all one topic.
Thanks

8
9

yes it is. sorry. i wasn't sure if this is a forum favoring new posts for new discussions or just continuing the replies within the same thread

10

Well, you could check he guidelines. But hey, we've all stepped in this hole.
Back to your relay.

11

You posted a link to a family of a bare relays.
They can't be driven directly with a NodeMCU pin.
A transistor will be needed, with a kickback diode across the coil and a base resistor.
Maybe easier to buy a 5volt relay module, which has all those parts included.
The NodeMCU can power a single relay module (~75mA) from it's V-in pin, but not the 4-relay module in the link. You will need an external 5volt/1Amp supply for that, which can also power the NodeMCU on it's V-in pin.
Leo..

12

@Wawa, you need to read the other thread. Really. I assume you have my comments blocked, so you may not even see this, but:

13

Yep, cross-posting makes things messy.
Leo..

14

sorry about the confusion; thanks for the help everyone, especially @camsysca