#Esp8266 arduino not connecting serial#
#Esp8266 arduino not connecting code#

When you power your Arduino from a separate supply, your Arduino and esp8266 has a different GND level so the RX and TX line between them must be floating. In your case, powering both 'Arduino UNO and esp8266' from the same computer works because the computer is fed from a single power supply and that the computer's GND wires on the USB line are 'common' i.e. So, if you wanted to power and use two or more PCB's together using separate power supplies, then you need to connect all of their (power supplies) GND's together so that you have a 'common ground'. You see, the transformer's output is 'isolated' from the AC line.īecause of this, every power supply connected to the AC line has an 'isolated/separate' GND and VCC level. What this does is both to lower the AC voltage down to a more operable AC voltage (which is then rectified to DC voltages) and also protect the user/equipment/(your house) in case of failure of the power supply (AC 230/110 V will seriously damage you!). Power supplies connected to the AC line usually have an 'isolated transformer' inside them. This problem happened to me when I first started dealing with electronics. I tried to run Arduino separately, without any other connections, but it not helped.

#Esp8266 arduino not connecting code#

But nothing helped.Īrduino not running code independently from esp8266. I tried to pull RX line to GND through resistor, to make sure that there are no noise on the line, added capacitors for power supply line, to make exclude pulsations on the line. I've made a search through same issues and nothing helped from theirs suggestions. at 5:28 Actually I made a mistake assuming esp8266 itself can act as a Wifi-Shield when it is connected with Arduino Uno, But it won't.

#Esp8266 arduino not connecting serial#

I can see it by Serial interface work, because code using it intensively, and when I'm turning Arduino on the RX and TX lines are down all the time, that I think indicates, that code is not running, and Arduino in boot mode, somehow. But, if I connect Arduino to separate charger that has USB port, then Arduino not running code.

If I connect all to computer's USB ports, everything working fine. Each connected via USB cable, for Arduino USB used as power line and standard firmware uppload line, for esp8266 only as power suppli line. I have an Arduino UNO and esp8266 connected to it.