ESP8266 ESP-201 module - first impressions

How to use this ESP-201 module for only serial communication (RCX and TRX) with arduino? Any extra wiring?? Also, TRX and RCX pin of this module are 3.3v but you have connected them direcly without any voltage divider at least for Module RCX pin. Is it OK? Safe for module??

What is the easy way to change the UART pins

Out of the box, what is the baud rate needed to talk to the ESP-201? I connect directly with an FTDI dongle but am getting no response.

cheers

Hi,

The ADC pin is input? It is possible to read from a LDR?

Thanks,
Alvaro

Is there any way to check if ESP-8266 boards are not defective. I am using USB TTL serial adapter. It has five pins. 5V, RX, TX, GND, 3.3V.

I've connected in following way
RX<->TX, TX<->RX, GPIO0<->3.3V, GPIO15 <-> GND

I don't see any response in minicom, I've also tried coolterm. I've tried 9600, 11500 baud rates. There is no way to set 76800 in both software.

Hi, mine had 19200 Baud, I've connected 3V3-3V3, GND-GND, RX-TX, TX-RX, 1015(IO15?)-GND, 100(IO0)-GND, CHP_EK(EN?)-3V3 and was able to flash with the NodeMCU Firmware Programmer

I wanted to buy this... But was in btw this and esp12
How many pins can i use as regular gpios in this esp201.
Thanks...

I'v ordered ESP-201 from here: http://www.aliexpress.com/item/5pcs-ESP8266-serial-WIFI-Industrial-stable-version-A-full-test-board-Full-IO-leads-ESP-201/32303950435.html

Works fine. No antenna problems. No need to ground GPIO15 to chat with module. Version 00170901. RS speed 115200. Needs AT+RST after mode-selecting, before WiFi connection set.  Embedded aps didn't check yet while received yesterday.

Hi,

I cannot find any details on the question what size of EEPROM (Mbit/MByte) is on your ESP-201?
And wanted to say thanks for your article.

Spent some time yesterday trying to get up and running with an ESP-201, with mixed results. I *did* at least get it to respond to AT commands at one point. Then I tried flashing a program via the Arduino IDE, it appeared to attempt to flash in two parts, but failed on the second.

After that, I was unsuccessful in even getting serial comms working again.

I had the IDE set to "Generic ESP8266", Flash size 512K, CPU Freq 80MHz, Upload speed 115200 (which is where I had my successful serial AT comms earlier).

I tried re-wiring and re-flashing a few times, but on my last try all I got was "warning: espcomm_sync failed
error: espcomm_open failed".

I seem to sometimes see conflicting information about whether GPIO0 and GPIO15 should be pulled up or down for certain functions. I have both CHP_EK and XCD pulled up to 3.3V.

Also, some guides show connections for DTR and RTS, but my FTDI Friend only has RTS available by default (with a solder jumper allowing a choice between DTR and RTS). I've just discovered that I can solder a wire directly to the DTR pad in order to get access to both lines simultaneously, but that will have to wait until I get free time again. But then again, some guides don't use those control lines at all.

I'll have to try to keep some notes as I go along and figure more about how things fit together...

What I'd like to see, but I'm not sure I have, is a guide that shows the *absolute minimum* requirements of what ESP pins need to be in what state for Serial AT comms vs Programming.

Successfully flashed tonight! Nothing fancy, just your standard LED blink. But at least now I passed the first hurdle, and I can work on something more real.

I get the followinh message from nodemcu flasher:

Note:Serial port connected.
Note:Begin find ESP8266.
Note:ESP8266 ACK success.
Error:Read ESP8266 register timeout.

What do I wrong?

Hi,

i successfully use the ESP-201 to switch a 2-channel-relay board via wifi and even work as a client to update some webdata at the same time.

Now i wanted to switch more relays.

In the picture shown above there are GPIO07 - GPIO10 available on the Pins D0 - D3.

I work with the Arduino IDE - but i don't get it to work that i can use these Dx-Pins to work as GPIOs (Output).

I tried with the pinMode-command - but no success.
Even the GPIO0 i do not get to work successfully.

Do you have any hints how i can get these Pins to work as GPIO?

thanks in advance...

The best way to use and learn about the ESP-201 is by using the SDK that it was designed for. The SDK has 2 LEDs, a buzzer, a DHT11 and a SPDT relay rated at 10 amps. All signals have pinned breakouts so you can prototype with them off of the board. I have downloaded to it using the Arduino IDE 1.6.4.
For $15 you can not beat it. I reordered and now have a total of 3.
http://www.ebay.com/itm/ESP8266-Serial-Wireless-Wifi-Module-Develop-Board-8266-SDK-Development-GOOD-/400914764132?pt=LH_DefaultDomain_0&hash=item5d5861d164

I get 2 piece ESP-201 from http://www.aliexpress.com/item/ESP8266-serial-WIFI-Industrial-stable-version-A-full-test-board-Full-IO-leads-ESP-201-IPX/32290998969.html and use PL-2303HXC to connect from ubuntu 14.04. I try many time with esptools.py, arduino IDE 1.6.5 and EXPlorer.
Connect:
Tx     -> Rx on PL2303
Rx     -> Tx
GND -> GND

VCC  -> 3.3V (onother power)
IO0   -> GND
IO15 -> GND
Chip_EN -> VCC

but can not connect, also try with all boudrate listed on ESPlorer and Arduino IDE.

But with Putty, when I use 115200, return "lb.lrl" ( code "6C 62 0E 6C 72 6C")
with Putty, I change IO0 to VCC, and float IO15, return "nn|..`." (code "6E 6E 7C 90 92 60 02")
when I change to another boud rate, some another code print out.
all time can not enter anything to Putty

Anyone can suggest me something to solve? Ihave try one day to change many speed but no result.

how to flash esp201 for use AT Command ?
what primary baud rate in esp201?
how to connect esp201 to arduino and control led?

My 201 module worked right away with the following setup:
3.3v connected to regulator output of 3.3v
GND connected to ground
CHIP_EN connected to 3.3v
IO15 connected to GND
IO0 pulled doen to ground with 10k resistor and pulled up to 3.3v with button when button is pressed
RST pulled up to 3.3v with 10 resistor and pulled down to GND with button when button is pressed
TX to RX on my FTDI module with chip FT232RL (on a hacklace device switched to 3.3v mode from fab4u)
RX to TX on my FTDI module
GND to GND on my FTDI module
USB of FTDI module to USB on my computer
FTDI driver installed on my Windows 10 computer and showing up as COM6
Arduino IDE 1.6.7 installed and serial monitor on COM6

My module shows the boot details when pressing reset or powering on even at 74880 baud:
reset leads to "ets Jan 8 2013,rst cause:2, boot mode:(1,7)"
power off and back on to "ets Jan 8 2013,rst cause:1, boot mode:(1,0)"

When switching to 115200 baud only gibberish shows up on boot but when pressing the button that pulls IO0 up to 3.3v then I can use AT commands to talk to the thing:

Ai-Thinker Technology Co. Ltd.

ready

AT+GMR
AT version:0.25.0.0(Jun 5 2015 16:27:16)
SDK version:1.1.1
Ai-Thinker Technology Co. Ltd.
Jun 5 2015 23:07:20

(Set Wifi mode to both Access Point and STAtion:)
AT+CWMODE=3
OK

AT+RST
OK

(List Access Points:)
AT+CWLAP
+CWLAP:(3,"behrens",-70,"5c:49:79:62:bd:6a",11)
OK

Thanks for the good report - without it it would have been difficult. I also looked at https://atulnivyadav.wordpress.com/2015/07/18/iot-encounter-with-esp8266... which gave more details on the wiring.

Hi
what is pin XPD?
where is a pin CH_PD?

Are there any benefits to the ESP201 compared to the NodeMCU dev boards? The latter are so cheap (less than £3 inc P&P) and since they break out all the pins on the ESP12E and have builtin USB-TTL level shifter, they seem very good value to me.

I have an FTDI dongle with a jumper for 3.3v (or 5v) operation. I connected my 201 as follows:

GND -> GND
VCC -> 3.3v
TXD -> RX
RXD -> TX
DTR -> IO0
RST -> VCC (or GND to reset)
CHIP_EN -> VCC
IO15 -> GND

With these settings, the serial monitor in the Arduino IDE (v 1.6.11) can connect to it at 74880 baud.

Спасибо за информацию!!!!!