How are you all? I have a very simple question that I don’t know if it will cause me problems in the future. Anyway, my CNC is simple but very useful… I managed to place a bluetooth module to control it via my cell phone, but I must also power the Arduino, I thought that powering the Shield V3 was not necessary, and I still need the 5V for other things, in the case the HC05 module and other modules.
Well, let’s get to the point… Can I solder the Arduino’s P4 input to the Shield V3’s power input and power both with 12V? In this case, just solder a negative and positive wire and connect it to the Shield V3 terminal.
Note: I will also connect a 12V fan to the Shield V3 terminal.
Edit: I just took a look a the schematic for the CNC Shield. It looks like the 5V lines are tied together for the CNC Shield and the UNO. I would not connect the 12V lines of the two devices if this is the case. If you need more 5V pins, you will need to break them out.
I’m feeding my CNC Shield/Arduino Uno stack with a 19v laptop power supply through the screw connectors on the shield (nothing plugged into the barrel connector on the Uno), and have not had any difficulties. I have added the experimental PWM hardware from V1 to control AC spindle speed (which has an arduino nano and an LCD display), as well as a couple of relays to control additional 110v outlets with 5v from the shield and control signals from the flood and mist pins. Then I’ve added a buck converter to get 12 volts for a case fan. I don’t think you’ll have a problem at 12 volts unless you over tax the power supply available amperage.
I was researching and Arduino supports up to 20V, I thought this wasn’t true. I was also researching about powering both the Arduino and the Shield at the same time, and I came across this video below. According to him, the Vin pin of P4 plug would be connected to Shield V3 terminal (positive), and then I could power either Shield V3 or Arduino through the plug, which would power the entire system. My question is, does this connection really make sense? In video you can’t see it so clearly.
(My intention is to feed both from the same 12V source: plug P4)
