Hi, I am struggling with ESP8266 for past 2 weeks. I have made all the connections as you and several other tutorials have mentioned. I am using an external power source for the ESP. I am not getting any response for AT. The serial monitor just remains blank. I have tried with different baud rates(9600 & 115200). I have noticed that whenever I connect CH_PD pin to 3.3V, my onboard red LED of ESP goes off. When I remove the CH_PD pin from 3.3V, the LED turns back on. All the tutorials have mentioned that the CH_PD pin must be kept at 3.3V. But on making this connection my LED goes off and the voltage between GND&VCC and also GND&CH_PD drops to about 0.8V when measured with a multimeter. Can you please suggest what needs to be done to get the ESP8266 working

[mihirdharap]

Please fill the info fields, it helps to get you faster support ;)

if you have a stack dump decode it:
https://github.com/esp8266/Arduino/blob/master/doc/Troubleshooting/stack_dump.rst

for better debug messages:
https://github.com/esp8266/Arduino/blob/master/doc/Troubleshooting/debugging.rst

----------------------------- Remove above -----------------------------

Basic Infos

Hardware

Hardware: ?ESP-12?
Core Version: ?2.1.0-rc2?

Description

Problem description

Settings in IDE

Module: ?Generic ESP8266 Module?
Flash Size: ?4MB/1MB?
CPU Frequency: ?80Mhz?
Flash Mode: ?qio?
Flash Frequency: ?40Mhz?
Upload Using: ?OTA / SERIAL?
Reset Method: ?ck / nodemcu?

Sketch

#include <Arduino.h>

void setup() {

}

void loop() {

}

Debug Messages

messages here

[rick-bp]

Hi! REST is pluged in?

Check this: http://buger.dread.cz/images/esp12f-basic-connections.jpg

[rick-bp]

To power on ESP12, you need:
REST and CH_PD must conected to 3.3V
GPIO15 must pull down to GND with 10k
GPIO0 must pull down to GND when you will send flash.

[mihirdharap]

I am working with esp 01 wich is having just 8 pins. I have tried with both, RST connected to 3.3v and rst left open. In both cases same problem persists. As soon as i connect ch_pd to 3.3v, onboard red led turns off.

…

On 1 Nov 2017 4:07 p.m., "Ricardo Pacheco" ***@***.***> wrote: Hi! REST is pluged in? Check this: http://buger.dread.cz/images/esp12f-basic-connections.jpg — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#3781 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AfvYRDAlAhrzu-LkZmo5LfE-IjFPEvJWks5syEnvgaJpZM4QOAfq> .

[rick-bp]

Check this: http://simba-os.readthedocs.io/en/latest/_images/esp01-pinout.png

May be, your ESP is burn out.

[mihirdharap]

Hi, To check the possibility of esp burning out, i bought a new esp module today, but exactly same problem persists. I am not understanding what am I doing wrong.

…

On 1 Nov 2017 4:48 p.m., "Ricardo Pacheco" ***@***.***> wrote: Check this: http://simba-os.readthedocs.io/en/latest/_images/esp01- pinout.png May be, your ESP is burn out. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#3781 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AfvYRMho5vD6_LpbpQIH51UuKAiMDyCxks5syFOFgaJpZM4QOAfq> .

[mihirdharap]

Hi, To check the possibility of esp8266 burning out, i bought a new esp module today. However, exact same problem persists. Following are the connections that I have done: ESP GND -> external GND ESP Vcc -> external 3.3V ESP RST -> external 3.3V ESP CH_PD -> external 3.3V My external source is a 5V power source with 2A current rating. I have used three 1k resistors to get 3.3V. I had also checked the voltages with multimeter before connecting to the esp module. All tge voltages were between 3.27V to 3.3V. I am really stuck at this and I'm not understanding what am I doing wrong. Please any help would be greatly appreciated!

…

On 2 Nov 2017 5:05 p.m., "Mihir Dharap" ***@***.***> wrote: Hi, To check the possibility of esp burning out, i bought a new esp module today, but exactly same problem persists. I am not understanding what am I doing wrong. On 1 Nov 2017 4:48 p.m., "Ricardo Pacheco" ***@***.***> wrote: > Check this: http://simba-os.readthedocs.io/en/latest/_images/esp01-pinou > t.png > > May be, your ESP is burn out. > > — > You are receiving this because you authored the thread. > Reply to this email directly, view it on GitHub > <#3781 (comment)>, > or mute the thread > <https://github.com/notifications/unsubscribe-auth/AfvYRMho5vD6_LpbpQIH51UuKAiMDyCxks5syFOFgaJpZM4QOAfq> > . >

[Pablo2048]

So You are trying to tell us, that Your power supply is NOT 3.3V, but 5V with 1k resistor in series?

[mihirdharap]

Basically, a voltage divider. As shown in the figure given in the link below.

http://www.akafugu.jp/images/schematics/divider.png

[Pablo2048]

Hmm, but this is definitely NOT proper way to power such kind of IC... Do get right power supply first.

[devyte]

Not the right place to request help for wiring.
Closing per #3655 and due to horrible title.

[devyte]

And no, a voltage divider is NOT the right way to provide a power source for any IC.

[philippe-gregoire]

Just to explain a bit, a voltage divider works based on ohm's law, i.e. the middle point of your resistors will present a voltage that depends on the R1/(R1+R2) ratio (here you have R1=2k, R2=1k) . When you connect your ESP to that middle point, it comes in // of R1, so you basically change the value of R1, to something much lower, hence the voltage drop you see.
Voltage dividers are ok to get reference voltage when there is no load (High impedance), not when there is current drain.
You should use a regulator for this (e.g. AMS1117).

[mihirdharap]

Thanks for the explanation!

…

On 3 Nov 2017 12:36 a.m., "Philippe Gregoire" ***@***.***> wrote: Just to explain a bit, a voltage divider works based on ohm's law, i.e. the middle point of your resistors will present a voltage that depends on the R1/(R1+R2) ratio (here you have R1=2k, R2=1k) . When you connect your ESP to that middle point, it comes in // of R1, so you basically change the value of R1, to something much lower, hence the voltage drop you see. Voltage dividers are ok to get reference voltage when there is no load (High impedance), not when there is current drain. You should use a regulator for this (e.g. AMS1117). — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#3781 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AfvYRNPLjKSNJpo91qKjRtGnkOBxW7YVks5syhKWgaJpZM4QOAfq> .

[mihirdharap]

It worked with a voltage regulator. Thanks a lot!!

[Utkarsha243]

Hi
I am also working with ESP8266-01 module. I have connected ESP8266 with arduino. I want to measure current drawn by ESP8266. But I don't know how to measure it because other components like LEDS, resistors all are connected to breadboard directly and measuring their current by multimeter is easy. But ESP8266 is connected to arduino, then how to measure its current.