Vin: The input voltage to the Arduino/Genuino board when it's using an external power source (as opposed to 5 volts from the USB connection or other regulated power source). You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin.5V: This pin outputs a regulated 5V from the regulator on the board. The board can be supplied with power either from the DC power jack (7 - 12V), the USB connector (5V), or the VIN pin of the board (7-12V). Supplying voltage via the 5V or 3.3V pins bypasses the regulator, and can damage your board. We don't advise it.3V3: A 3.3 volt supply generated by the on-board regulator. Maximum current draw is 50 mA.GND: Ground pins.
If I pull out the red wire to the arduino 5v pin and connect the red wire from the power supply to the 5v pin on the arduino, how do I then connect directly to the display, use 2 wires??
I knew something would be wrong withe way I have it connected and working.i am not seeing any problems, and I have not had it connected this way before. It was however connected to the vcc pin on the display, Then there was a problem.
You can use the barrel jack to power the Arduino or is you are careful you can use the 5V pin. But if you use the barrel jack for power, your CANNOT use the 5V power to power anything else. The regulator between the barrel jack and the 5V pin has just enough to run the Arduino. Attaching anything to the 5V when using the barrel jack (or Vin in pin) causes the EXACT issues you have described.
When you say :Under no circumstances should the "barrel jack" on the UNO be used in an attempt to power the circuit.Do you mean this particular circuit, or any circuit.
5V: This pin outputs a regulated 5V from the regulator on the board. The board can be supplied with power either from the DC power jack (7 - 12V), the USB connector (5V), or the VIN pin of the board (7-12V). Supplying voltage via the 5V or 3.3V pins bypasses the regulator, and can damage your board. We don't advise it.
If I was standing next to you, I would have reached over and yanked out the red wire connected to the 5V pin, 10 posts back.
I connect 2 red wires to the female barrel jack, correct or not.Then connected 1 red wire to the arduino 5v, and the other red wire to the display. If the first one is not correct then this wil be alsoI connected the black gnd wire from the female barrel jack to the gnd pin / socket on the arduinoThen I connected the male barrel kack of the 6v power supply and hoped. The display flashed on, then off .Thanks
What is a 5C power supply, as I can't say i've heard of them.
Ok if I use a 5v power supply which has a barrel connector, and plug that into the female jack plug on the arduino, which now does not power the display, but did so yesterday, how do I get a 5v supply to the display
Per your reply as post #45, you are using a 5V power supply. Therefore you CANNOT use the Barrel Jack and you CANNOT use Vin. You can only connect to the 5V pin. That will only power the Arduino.
So I can use a 7v to 12v on the barrel socket/connector, and the Vin is the same from what I have read.Alright then, I will use a 7v power supply, and I have a 5v wire to the display, which gives 5v, well 4.92v , on the display.
You will be working with two powers upplies which means you MUST connect the grounds together (at some point) or you will run into a whole new set of issues.
Two power supplies?I just said i'll use a 7v power supply, only 1. The 2 grounds are together
Alright then, I will use a 7v power supply, and I have a 5v wire to the display, which gives 5v, well 4.92v , on the display.
So I will write this again.You can only use one of the three following connections:1. Barrel Jack (for 7-12V power supplies)2. Vin (for 7-12V power supplies)3. 5V (for 5V power supply)PICK ONE and ONLY ONE.