I have a quite strange powering problem here.
So.. I´m trying to power up 8 * 12V relays and 2 NodeMCU´s. I have an 12v external power supply which says INPUT = 1A and OUTPUT = 3A. I take power to 8* 12V relays (2*4relays sets) from that and for some reason I´ve needed to add an 12V to 5V power converter to give power straight via USB port to that NodeMCU which controls those 8 relays. If I try to give power from those G- and VIN-pins which i use with the other NodeMCU, it doesnt power up the relays at all.
I´ve only been possible to start these 2 NodeMCU´s and 8 relays same time by giving 5V power straight to the USB-port of the one NodeMCU which controls those relays. And even that happens only sometimes.
So something is seriously wrong. Have I connected wires somehow wrong? But still, looks like those just doesnt get enough power for some reason. 3A isnt enough? But both NodeMcu´s power up just fine (with relays) if i give them power for ex. from laptops USB port individually and it gives only 1A out right? What does that INPUT = 1A on that power supply actually means?
I have 3 screws on that 12V to 5V power converter. What does those CC- and LED-screws means? CV i´ve used to set the 5V output. Is it possible that this power converter limits the ampers somehow?
Anyone know anything about this kind of behaviour? This is weird cause sometimes it works, but usually not.