Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [esp8266]

The ESP8266 is a low-cost Wi-Fi chip/module with UART connections and a built-in TCP/IP stack. It has an Xtensa single-core 32-bit L106 MCU, usually running at 80 MHz.

There's a large community behind the ESP8266, some important / interesting pages are:

The ESP8266 is becoming increasingly popular, especially among *duino-users.

Be careful:
Some information in the tutorials or example software online is outdated and incorrect.

980 questions
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ESP8266 eLUA (NodeMCU) vs MicroPython

I am searching for an unbiased, up-to-date comparison of the eLUA (NodeMCU) and MicroPython on ESP8266. I can only find very superficial reports/blogs of users trying out one or the other. - All of which lacking entirely of technical details. The…
ARF
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ESP8266 - is it used in real industry?

I wonder if ESP8266 or similiar (ESP32 for example) modules are used often in real mass production in medical/automotive/military/households industries. I see many DIY projects with it, but there is a better alternative for mass production? If yes…
Sławomir Kozok
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How to drive 700mA LED cheaply?

I'm new to electronics and am trying to make a night vision circuit. A similar question has been asked before, but with priority on efficiency. I want to control a 700mA-1000mA IR LED using a 5v input and an ESP8266 microcontroller as part of a…
maurera
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Using TP4056 module to charge battery while load remains connected

I need a circuit that utilizes the tp4056 breakout board to power a NodeMCU ESP like so: tp4056 USB port connected: 18650 battery charging and NodeMCU running of USB tp4056 USB port not connected: NodeMCU running of 18650 battery The problem is…
WhiteSpin
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Low pass filter with two capacitors?

I'm trying to drive a speaker from an ESP8266 for a project, and found an article suggesting (ab)using I2S as a 1-bit Pulse Density Modulation DAC. Apparently that's pretty noisy, so the article gives the following circuit diagram for the low pass…
Garth Kidd
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Fetching current time from unconnected wifi networks?

Is there a method for finding the current global time (UTC or other) using an off the shelf WiFi module like the ESP8266, but without actually connecting to one of the available networks? Basically i'd like to use this in a similar fashion to how…
T Grandahl
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ESP32: how to keep a pin high during deep sleep (RTC GPIO pull-ups are too weak)?

I'm using an ESP32 in a battery-powered device. The ESP spends most of the time in deep-sleep to save power. The device also has some 5V-powered sensors which I'm feeding from a MCP1640 step-up converter, which is on during the brief active part,…
anrieff
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Replace AMS1117 5V-3.3V LDO on NodeMCU for LiPo with low quiescent current

I want use my NodeMCU to drive a SIM808 Module with integrated LiPo Charger. https://www.itead.cc/wiki/SIM808_GSM/GPRS/GPS_Module There are two problems. First of all the SIM808 Module just provides the LiPo Voltage, no steady 3.3V or 5V output. The…
Schr0nk
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Is it better to use a MOSFET with a gate driver IC or a MOSFET with a lower VGS,on?

I am building an RGBW controller for my room. I will be using an ESP32 with four MOSFETs for each channel. I want to know which is best for fast switching. Do I need to use a MOSFET driver IC such as the ICL7667 with IRFZ44n or is it better to use a…
Uzair Ali
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Trying to get (more) accurate readings from thermistor (electronics, math, and code inside)

So I'm trying to get accurate temperature readings off this TDK B57164K472J thermistor... It's connected in series with a 1 K resistor, and connected to an ESP8266's onboard ADC. The thermistor has a Beta of 3950, and the datasheet includes a table…
poorandunlucky
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Is this a sensbile way to switch a 12V line with 3.3V logic

I am just starting to learn about making electronic things, so this may be a foolish question. I think this is adequately different to similar questions here. As a first project I am working on making a fan controller based around an ESP32/ESP8266…
kortschak
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Saturation Points for Mosfets; driving gate with 3.3V output

I'm still new to this so please go easy on me :) I'm looking at using N channel Mosfets to act as a switch between my microcontroller (ESP8266 breakout board) and LED Strip. Here's the schematic: When I was reading about how mosfets and transistors…
Casper
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Any clever way to provide 3.3V with good current output from a 9V battery?

I'm sorry for any English mistakes as I'm not used with using it when talking about technical stuff. I have been using some ESP8266 WiFi modules with Arduino Mega for a project. They work with 3.3V Vcc but require some good amount of current (it can…
Bruno
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Reading the analog pin A0 on Wemos D1 Mini

I am doing a personal project with a Wemos D1 mini and one thing that was of interest to me was to detect a servo-motor stall. I was very glad to find an useful answer to this question: How do I detect servo stall with an Arduino? I re-created the…
Robert Chiras
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ESP32 logic HIGH/LOW level voltage, not working?

From ESP32 datasheet: In my case: VDD = 3.3V Vil (max) = 0.25 * 3.3 = 0.825V Vih (min) = 0.75 * 3.3 = 2.475V Theoretically: LOW LEVEL range is -0.3V to 0.825V HIGH LEVEL range is 2.475V to 3.6V But when I tested practically: LOW LEVEL range is 0V…
Pradyum Aadith
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