ESP8266 Community Forum

- Tue Dec 16, 2014 7:44 pm #4984 Hi, I'm new to the forum and fairly new to the Arduino.
However I've done quite a few of the tutorials and altered these around to learn as quickly as possible.

I've recently bought an ESP8266 and looking at various websites and YouTube videos seem to get quite a bit of conflicting information.
This is all down to the fact that the ESP8266 is 3.3V and pulls more current than the Uno can offer when it is flat out.

To get me started could someone possibly provide a schematic for the connections. I'm hoping that I don't have to buy anything else.
If possible this needs to be a straight connection between the Uno and the ESP8266 but keeping things so that there is no chance on causing any damage to the Uno.

For powering the ESP8266 I had thought of using a 9V battery with a voltage regulator of which I have some BA033T's. I know the battery life may not be good but thought that if this lasts at least a couple of hours it will more than do me for learning about how to use the board.

I'm not sure if there needs to be any split voltages on the transmit and receive pins, which is why I'm hoping for a schematic with any resistor values for this and a 9V power supply with the voltage regulator.

Thanks in advance,

I may be new but it's all about understanding how things work and doing it yourself that you learn, so where I start to use peoples code I don't just copy and paste, I type it in to learn and see how I can alter things.

- Sun Dec 28, 2014 5:29 pm #5850 The best way is to use a 4050 buffer IC on the line from the Arduino TX to the ESP(RX). power it form the 3.3V and then the ESP won't get fried.

I don't have fritzig or whatever to draw a diagram, but using AltSoftSerial to talk to the ESP on pins 9(TX) and 8(RX).

Adruino 4050 ESP
pin 8 TX
pin 9 pin 3
pin 2 RX
GND GND

4050 power: pin 1 -> 3.3v
pin 8 -> 0V

Dave

- Mon Dec 29, 2014 3:30 pm #5908 Thanks for the reply Dave.

I'm guessing you mean use one of these http://pdf1.alldatasheet.com/datasheet-pdf/view/50859/FAIRCHILD/CD4050/+_0J5-UwYhRDpKxHepKwY.z+/datasheet.pdf chips.

I've read that the ESP will draw more than the Uno can provide on the 3.3v supply, so it's a case of not blowing either side.

This is why I've asked for a schematic, which I'm really having issues with especially after 400+ views and only your reply.

Paul