Hello,
I have a simply problem to run an ESP01.
Whei I run the ESP01 using a USB adapter then it works fine. The red LED is on and the blue LED is flashing.
But if I make a direct connection (loop cable) between the USB adapter and the ESP01 only the red LED is on but there is no WiFi activity at all.
Do I need more other configuration?
Maybe some one can give me a hint.
Thanks!
Schematic or photo would be nice ,It`s not clear which usb adapter and what is " direct connection (loop cable) between the USB adapter".
Are you replacing the direct plug-in connection with eight male-to-female jumpers between the two connectors? Or maybe an 8-conductor ribbon cable with IDC connectors at each end?
That the blue light is flashing means that there is activity on the Serial bus (ESP-tx) or that it is repeatedly resetting (throwing out error messages over Serial) You have not determined anything really.
Thanks a lot for your answers.
Maybe my question is a little confusing.
I want to drive a servo.
This has to controlled by an esp01 via WiFi.
Ab power bank provides th power for the servo.
So what I need is a device wich reduces the power from 5 v to 3.3 v for the esp01.
The control signal comes also from the esp01.
Is there a ich way to doch einfach this?
Sorry but do not know how to provide a picture.
So a 5V to 3.3V buck converter?
A simple lineair voltage regulator will do the trick, not super energy efficient, but easy enough.
Hello,
thanks for your answers!
I think a pure connection from 3.3 v source to the ESP01 in not sufficient enough.
When i make a direct connection from the USB adapter or any other 3.3v sources (5v t 3.3 v step down inverter or 5v to TTL adapter) does not work.
Only if I connect the ESP to the USB adapter it works.
In the internet I found a hint that I have to add also 10 kΩ resistors to the CH-PD and RST pins.
Is this ok?
are you using a ESP-01 or ESP-01S - see ESP8266_01_pins, e.g.
GPIO0 and GPIO2 need to have pull-up resistors connected to ensure the module starts up correctly. The ESP-01S has 12K resistors on the board for GPIO0, RST and CH_P
Edit: also The ESP-01(S) needs a 3V3 supply with >250mA capacity - a higher voltage could damage the devive
You didn't answer the question in post #3.
How many wires do you use for connect a USB adapter to your ESP?
Please insert a connection diagram or photo of the wirings.
All users are strongly recomended to read the forum guidelines before they can start a discussion in the forum.
@b707 , excuse me please I use 2 wires. One for 3.3v and one for GND.
In my experience, the ESP01 is sensitive to the physical layout of it's power source and just running wires isn't reliable.
Much better to use an adapter board with the voltage regulator and bypass capacitors and a socket for the ESP01.
Something like this: https://protosupplies.com/product/esp8266-esp-01-adapter-with-voltage-regulator/
A "weak" power source may cause the ESP01 to endlessly reset when it turns on the wifi radio which causes a big surge in current and a drop in voltage enough to trigger the brownout detection on the chip.
@MrMark ,
yes I have something like this.
USB to ESP-01 adapter
I think will use this an modify the ESP-01.
If you don't need the serial port or the serial port pins, you could probably just run wires to the +5 and Gnd pins of the USB connector on your USB Programming Adapter and I'd expect it would work.
So you'd be using the voltage regulator circuitry on the adapter, but not the USB to serial functionality.
Without a picture or schematic, of what you want to do, it`s a guessing game...
Btw, CH_EN pin must be set HIGH if want it to work.
I tend to use a ESP-01 Helper V3 which enables on the program and run the ESP-01 code without flicking switches etc
the CLONE breakout port enables connection to the device for access to I2C, serial IO, etc
Hi, @kwhhSt
I agree...
@kwhhSt PLEASE....
Can we please have a circuit diagram?
An image of a hand drawn schematic will be fine, include ALL power supplies, component names and pin labels.
Lets all get on the same page and also post some images of your project.
Thanks.. Tom... 
There should be lots of information on the internet, but when getting Google search results, please focus on the topics that are on this forum.
@TomGeorge,
this ar my connections:
- simple power source (3.3V)
- connection for servo
Both of them are not working.
