Wifi module LED not turning on

[azree]

Hi, i just bought ESP8266 and follow the schematic wiring diagram with my Uno as per image below. but my wifi module LED light is not turning on (even before compiling)

is it normal or it basically not receving enough power from 3v port?

[qubits-us]

@azree

ESP8266

googling -"wiring esp8266 to arduino uno"
see a few variations, none of them have RST high??

sorry, good luck.. ~q

[azree]

i already did, even followed many youtube tutorial
but i just wondering if my ESP is burnt or what.

hence why i need some confirmation if the lcd within the module should emit anything upon schematic connection.

halllllpppppp

[camsysca]

Is that module pinout 'seen from above', or 'from below'? I've seen both variations. Check carefully. This might help:

[azree]

so you're saying mine was inverted? gosh silly me if it was

[camsysca]

It depends, if you were 'fly wiring' with individual dupont f-m wires, it's an easy mistake to make. If you were plug-and-pray, probably not, unless you made the mistake of soldering male or female headers in the wrong direction(top vs bottom), which I've also seen in DIY save-ten-cents-solder-it-yourself options.

[azree]

haha! im using dupont wires.
if in my case my dupont went to wrong terminals due to inverted positioning shown from the above schematic. then indeed the led wont turned on, yes?

here's another labelling of the terminals and let's compare whether the attached image in 1st post is wrong or the later is.

[PaulRB]

You must not connect anything to the Tx & Rx pins of Uno. They are used for sketch upload and Serial Monitor. If you connect anything else to those pins, it will interfere and you may not be able to upload your sketch.

You will need to use Software Serial library, to make a second Tx and Rx using other Uno pins, to communicate with the ESP.

Also you must not connect any Uno output pin directly to the ESP. The ESP is a 3.3V device but the Uno is a 5V device, so it's outputs can damage the ESP. You must use a voltage divider to reduce the 5V signal down to 3.3V. A pair of resistors, such as 10K and 22K, will work for this.

[azree]

thanks. i did connect the live wire to 3v3 terminal and ground. so u mean i should reassign tx and rx port in my ide sketch to let the led light turned on or ;

or i should and 1k resistor despite connecting it to 3v3?

[camsysca]

Paul is technically correct regarding TX and RX usage, more on that in a minute, but your LED should work, hence something is wrong. Either your Wifi module is pulling too much current from the 3.3 V supply, or something is miswired. I don't have such a module, so I can't comment on whether it will work reliably when powered from the UNO.

Regarding TX and RX, you must disconnect USB when running your sketch, and disconnect your Wifi module from TX and RX when uploading code; serial monitor is useless, as you need USB connected when using it, and you can't do that with the Wifi module connected, so your DITW. It's a very awkward and inconvenient way to do development.

[azree]

is there any other module that can resist agitation from the needs to plugging in and out that's suitable with Uno?

[PaulRB]

Combining Uno and esp-01 is not a beginner project. The two modules are not well matched.

I would recommend using a wemos D1 mini, instead of the combination of Uno and esp-01. All the problems you are having disappear. There may be other, different problems later, like not having enough pins, but they can be overcome.