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 thread  Author  Topic: ESP8266 alert! 10k Resistor needed for 3v!  (Read 276 times)
michael
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xx ESP8266 alert! 10k Resistor needed for 3v!
« Thread started on: Sep 24th, 2015, 08:50am »

Mmiscool gave me some resource material to figure a way to interface with this unit using Liberty Basic directly. I am studying it now and I will try to get some results.

IMPORTANT ALERT FOR POWER SUPPLY !!!

If you look in your Arduino instruction manual you will see the resistor I am talking about.

Here is a link to the resistor:
https://www.bing.com/images/search?q=10k+resistor+pictures&view=detailv2&&id=B9A3DA0E64543D9BF10A973BEFEB5A0350E03BF1&selectedIndex=0&ccid=RfrdlU3Q&simid=608053802308666453&thid=JN.a9vfBHn9Uv%2f7z7yxFzwn6Q&ajaxhist=0

My resistor on the esp8266 is a 10k resistor
starting on the 3Volt positive, on VCC the resistor would be:
brown stripe, black stripe, orange stripe, gold stripe.
on the gold side of the resistor you must attach it to CH_PD on your ESP8266

The CH_PD does not use as much power as the VCC 3V connection.

Here is a link to the wiring diagram on Mmiscools site:

http://www.esp8266basic.com/flashing-instructions.html


Over time if you don't do this, you will have problems, and you can kiss your module goodbye.

If you use 2x AA batteries to power it you will need the resistor.. and the resistor stays on when flashing it also.
I think I saved mine in time.. it was getting warm and I had a feeling something was off when I used my 3V (2x AA) batteries to supply power as it is recommended.

REMOVE THE AA Batteries when you hook up to FLASH the module!!! (see Mmiscools diagram)

Do not remove the resistor when flashing!!

Now that I made this change it seems to be ok.(hopefully I wasn't too late)

The resistor is absolutely needed!! No question!!
Ever since I made this modification my ESP8266 has been working well. (Fresh 2xAA batteries in 3V configuration helps too)

***********************************************
THIS FOOT NOTE NEEDS TO BE RESEARCHED MORE.. it may be a 3Volt 10uf capacitor but I am not sure yet.

According to the recommended 3V( 2xAA battery connection) you would also need a 10uf Capacitor between the VCC and the ground.. But I don't think I have one and it seems to be ok.. But I will put a capacitor on when I can get one

Quote:
Capacitors are widely used in electronic circuits for blocking direct current while allowing alternating current to pass. In analog filter networks, they smooth the output of power supplies. In resonant circuits they tune radios to particular frequencies. In electric power transmission systems, they stabilize voltage and power flow


Here is an image of a capacitor like the one I found will work: 100uf 25v- It should be in your Arduino kit.
http://www.bc-robotics.com/?s=100uf+capacitor&post_type=product
« Last Edit: Sep 24th, 2015, 3:27pm by michael » User IP Logged

Gidiom2
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xx Re: ESP8266 alert! 10k Resistor needed for 3v!
« Reply #1 on: Sep 24th, 2015, 11:31am »

Just a little 'useful' information - resistors can be connected either way round so the colour bands are irrelevant apart from indicating the resistor value and the capacitor does not have to be 3v working nor even 10 mF. If you have something like 20mF/6v or 10v working, that will be fine for filtering the DC supply. Just make sure the capacitor polarity is correct as it will be an electrolytic type.
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michael
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xx Re: ESP8266 alert! 10k Resistor needed for 3v!
« Reply #2 on: Sep 24th, 2015, 3:49pm »

I put a 100uf 25v capacitor on it after reading deeply on how capacitors work.. They keep the current changes constant.. Kinda like a battery.

Although this capacitor is refered to as a decoupling capacitor.
Sorry that this subject drifts from the coding, but I wanted to help prevent people from losing a piece of hardware.
With the capacitor it seems the device is more stable on wifi.

I put a link to a capacitor that looks like it on the bottom of the first post I made.

« Last Edit: Sep 24th, 2015, 3:54pm by michael » User IP Logged

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