Blynk, SNES, and NodeMCU
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Hey there, /diy/nosaurs!
So I got my NodeMCU in the mail and I've soldered wires to the pads on my SNES controller.
I'm using the Blynk library and interface to connect to and control the NodeMCU.
Now, in theory, I should be able to press the button on Blynk and it "presses" the button on the controller.
Instead, nothing happens. Not a goddamned thing. I just sit here, mashing digital buttons and nothing happens. I tried to connect to the ground pads and see if that works. Nothing.
Anyone have any ideas as to how to get this goofy-ass project working?
>>997335
First you need to understand how buttons work.
>>997355
See, I think you're being a smart-ass, but I never can tell over text.
Nice Dubs by the way.
But I was going to update the thread and say that I connected an NPN transistor to the pads. I connected the collector to the ground pad, the base pad to the pin on the NodeMCU, and the emitter to the actual pad that presses the button on the controller.
Should I be using a PNP transistor for this? I've tried a 2N2222 and a BC547 NPN transistor and they do nothing.
I've even flipped the emitter and collector on both pads and nothing changes.
>>997361
Sorry, was being a bit of a smartass.
Is the trace that goes around to all the buttons +V or is it ground? If it's ground, the NPN emitters goes there. If it's +V, the PNP emitter goes there.
What voltage does the NodeMCU put out? You probably want a 1-10k to the base anyway.
>>997364
No worries.
And all of the buttons share a common ground.
I didn't have a resistor attached to the base. Would that really make such a big difference?
>>997379
The BE junction of a BJT basically is a diode. You need to limit the current out of the ESP pin unless it has protection built in.