Can't connect ESP8266 to UNO

Projects Networking, Protocols, and Devices
1

Hi, i am connecting a ESP12s(same as 8266) to a UNO through SoftwareSerial.
Few weeks ago, i have already connected them together successfully,
AT with response ,connect wifi, check firmware versions stuffs

However, few weeks later, i try to use AT command , it fails. No response , can't connect to wifi.
I am using the same setup,Tried all different baud rate, but it just doesn't work.

The only response i can get from the serial monitor is when i press the RST button on the module, then outputs gibberish characters.

Please help! Whats going on?

2020-02-17 上午12.49.25.png
2020-02-17 上午12.49.25.png584×522 452 KB

2

Lose wiring connections might be something to look into

3

zoomkat:
Lose wiring connections might be something to look into

Tried already, seems not working. But now i figure out what those gibberish characters shown when i press the RST button. Still can't use AT command. What's happening!?

02:51:42.629 -> ets Jan 8 2013,rst cause:2, boot mode:(3,6)
02:51:42.629 ->
02:51:42.629 -> load 0x40100000, len 1856, room 16
02:51:42.629 -> tail 0
02:51:42.629 -> chksum 0x63
02:51:42.629 -> load 0x3ffe8000, len 776, room 8
02:51:42.662 -> tail 0
02:51:42.662 -> chksum 0x02
02:51:42.662 -> load 0x3ffe8310, len 552, room 8
02:51:42.662 -> tail 0
02:51:42.662 -> chksum 0x79
02:51:42.662 -> csum 0x79
02:51:42.662 ->
02:51:42.662 -> 2nd boot version : 1.5
02:51:42.662 -> SPI Speed : 40MHz
02:51:42.662 -> SPI Mode : DOUT
02:51:42.662 -> SPI Flash Size & Map: 32Mbit(512KB+512KB)
02:51:42.662 -> jump to run user1 @ 1000
02:51:42.696 ->
02:51:42.797 -> rf cal sector: 1017
02:51:42.797 -> rf[112] : 00
02:51:42.797 -> rf[113] : 00
02:51:42.797 -> rf[114] : 01
02:51:42.797 ->
02:51:42.797 -> SDK ver: 1.5.4.1(39cb9a32) compiled @ Jul 1 2016 20:04:35
02:51:42.797 -> phy ver: 972, pp ver: 10.1
02:51:42.797 ->
02:51:42.797 ->

4

Ronneychu:
Hi, i am connecting a ESP12s(same as 8266) to a UNO through SoftwareSerial.
Few weeks ago, i have already connected them together successfully,
AT with response ,connect wifi, check firmware versions stuffs

However, few weeks later, i try to use AT command , it fails. No response , can't connect to wifi.
I am using the same setup,Tried all different baud rate, but it just doesn't work.

The only response i can get from the serial monitor is when i press the RST button on the module, then outputs gibberish characters.

Please help! Whats going on?

If you have a ESP-12, why are you using an Arduino ?

.
ESP8266 needs robust 3.3V 1A power supply
ESP8266 defaults to 115200 and the SoftwareSerial does not work well if at all at 115200.

.

5

The only thing will show up is the boot log, can't flash the firmware even in the flash mode

6

My only experience is with the ESP-01 which is the simplest module with the ESP8266.

Flashing the ESP8266 is not hard, but you have to make sure the required pins are connected properly.

How are you providing 3.3V ? If you are using the Uno's 3.3V, BAD !