Questions tagged [esp8266]

The ESP8266 is a low-cost Wi-Fi chip/module with UART connections and a built-in TCP/IP stack.

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Send data over server from microcontroller

How large chunk data of data is send over internet using GSM module or ESP from some kind of microcontroller. As they both have a limit of data sent by TCP so how is it done and what is used to ...
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56 views

How do I change the crystal frequency of an esp8266?

I'm new to microcontroller in general and after playing around with an arduino I would like to go further by using an esp8266 resp. ESP-WROOM-32 and play around with it. I'm programming them via ...
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whats does the ESP-01S LED indicate [closed]

I recently bought an ESP-01S module and it only has one blue LED on it (unlike the other ESP8266 modules) and when I connect the 3v3 and gnd, it blinks twice. I was wondering what does this LED ...
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Are there any pins that need to be wired in certain ways for the ESP8266 to work?

So I'm making a PCB for a project so I don't need to use a node mcu and only need the esp8266 but I not exactly sure if there are any pins that should be wired obligatorily for it to work. Here is my ...
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project guidance for a newbie: esp8266 nodemcu + arduino mega, or by itself [closed]

I need your guidance on a couple things (hardware amateur). I have two force sensitive resistors that output data that I want to send over wifi via the esp8266 NodeMCU. I have a couple questions. I ...
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MOSFET unwanted turn on

Good day everyone, may god save us from this pandemic. I have below schematic, all of them share the same source and ground. When 5V applied for a few seconds (e.g a button press) to the MOSFET, relay ...
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61 views

15V to 3.3V to power ESP12E

I need help designing a power conversion circuit from 15V DC to 3.3V DC to power an ESP12E module (which can handle max 350mA, but actual usage will be 80mA). I have tested a prototype with Wemos D1 ...
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ESP8266 with ultrasonic sensor, booting custom circuit and using gpio0, gpio2 pins for echo and trigger - would this set-up work?

I am designing a circuit from scratch with an esp12 module. For booting the esp8266, the GPIO0 and GPIO2 need to be pulled up to Vcc (3.3V) and GPIO15 needs to be pulled down to GND. I added to my ...
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41 views

How to safely charge a capacitor with a GPIO pin of an Arduino/Raspberry pi/ESP8266/Attiny

I know that the question should be explained in more detail, but there is not really anything more to be said about the above-mentioned question. Thanks for your suggestions
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Switch on an esp8266 with a npn transistor (2n2222A)

this is my first question here, so I would like to ask you to kindly point out my mistakes regarding the question instead of just pressing the down arrow. That way I will have the opportunity to ...
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NDP6020P P-Channel MOSFET + ESP8266-01 Voltage Drop

I'm trying to power a ESP8266-01 with a NDP6020P. My main power supply is a buck converter configured at 3.6V. I connect the NDP6020P source to 3.6v and the Gate to Ground. If I calulcate the Drain ...
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Why are pins in my ESP8266 getting damaged?

I designed a circuit and a PCB to connect a relay, a switch, a Modbus-to-serial and two sets of DS18B20 to a ESP8266, specifically ESP-12F, to be controlled via ESPhome. The power is provided by a AC-...
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Arduino esp01 UART connected server with driver

I have a project of WiFi oven driver and I would like to know if I don't overcomplicate any aspects. Or are there any existing tools for what I'm trying to do. I decided, to connect mentioned devices -...
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55 views

Unstable relay when using single power source

I am trying to control a 5V fan using an ESP01 and a relay module from LC Technology. The setup works when I use 2 power sources but my setup requires a single power source which is unstable. The ...
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56 views

Switch 12V with 3V control circuit

Edit: I did a dumb-dumb. I got the emitter and collector mixed up on both transistors. Now it works. What I'm trying to accomplish: I'm planning to run a ESP8266 microcontroller in my car. The ESP ...
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How to make 2 or more bluetooth devices(ESP32) get RSSI Values(signal strengths) of each other?

I am creating a prototype for a Social distancing tracker using bluetooth devices, wherein if 2 bluetooth devices come in close proximity(measured with signal strength), then both modules send their ...
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ESP32 with external power supply and serial communication between ESP32 and PC

I would like ESP32 with +3v3 external power supply. I don't want to use PC-USB's power supply through +3V3 voltage regulator. Is it possible to make serial communication between ESP32 and PC using usb-...
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10-bit ADC resolution doubt - 1023 or 1024? ESP8266

I am working with ESP8266 which has a single ADC channel with 10bits and 1V reference. What is the correct resolution in mV/ADC result? 1000mV/1023 or 1000mV/1024? Also, I wonder if the reference of ...
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39 views

Sensing doorbell directly off the secondary of the bell transformer, with an ESP

New here, and not so skilled, so be kind to me... I've got a very simple electric, old fashioned "ding-dong" doorbell, that I'd like to migrate to the 21st century. It's basically a ...
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78 views

WEMOS D1 R1 Interrupt repeats continuously, when triggered, Is it bouncing? How to fix it?

I am having such a nightmare to make it work, I am using a WEMOS D1R1 to handle the movement of an encoder via external interrupts. Instead if detecting the edge (L to H), it detects the status, so ...
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NodeMCU + PIC16F877A IoT Project Problem

I've searched the internet for my specific use-case but had no solution. I have a circuit set up with PIC16F877A which perfectly displays a hard-coded text on a 16x2 LCD. But I want to change that ...
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21 views

LiPo Battery power monitoring with ESP-12E

I am using 3.7V LiPo battery and ESP-12E in this project. I need to monitor how much charge is there in the battery to help when battery falls below certain level and notify to charge it up again. I'...
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73 views

esp8266 power supply problem

It's the fourth esp8266-12e that destroyed with my AMS1117-3.3 voltage regulator. I'm powering esp8266 with AMS1117-3.3 module and this simple circuit: ...
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Node mcu , D1,mini and alexa integration issue

I am being watching too many vdo of making a smart switch using esp8266 and 4 channel relay. Tried many sketches with fauxmoesp, uploaded hundreds of time successfully in di mini as well as node mcu ...
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Esp8266 node mcu and 5v relay powering issue

i am really frustrated and worried as my problem is unsolved. I am using an esp8266 nodemcu and a 4 channel 5v relay. When i power both with external 5v 2 amps supply it doesn't work, on the other ...
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Easiest way to send basic data from Android to ESP8266 through WiFi

I'm not really familiar with network protocols, but my application is very simple: The ESP8266 is connected to the phone's WiFi hotspot (so they're both on the same network). The phone sends 1 (as in ...
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49 views

I2S audio interface - sync of MCLK and LRCLK signals

I plan to use IC AK4430, an I2S digital interface sound output chip, to be connecte to an ESP-07 Wifi module via 3 wires (BITclk, LRclk and DATA). But the IC also require an input signal that they ...
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ESP-07S / ESP8266 I2S audio interface with audio codec IC (audio input + output mono)

I have never dealt with digital audio interface like I2S. I want to use ESP-07S / ESP8266 audio interfaces as digital audio I/O (for mic + speaker). ESP-07 has two I2S interfaces: 3-wire audio input ...
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How to use most GPIOs of ESP12e for simple push button inputs and led outputs?

I'm using esp12e for my project and encountered difficulty in using more than 5 GPIOs. I have connected GPIO15 to Ground, GPIO0 to VCC, Enable to VCC (Connections as as per attached image). I'm able ...
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182 views

Trying to interface with intercom / door phone system (Read 15 times)

I have a project idea where I want to interface with my intercom / door phone system. Its a proprietary system developed by SSS Siedle, and there is next to no documentation or research on how these ...
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45 views

Cannot establish serial communication to ESP8266

I recently designed, had manufactured, and populated my first PCB. As context for the schematic and PCB, the requirements were as follows: Independent control of seven LEDs The ability to program ...
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42 views

I2C not working unless its through a mosfet (not level shifting)

Ive been dipping my toes into the world of hardware over the last year and I'm working on a project that i've been stumped on for a few months now. I've made progress on alot of roadblocks but this ...
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64 views

Sending AT commands from Arduino Nano to ESP8266 does not work [closed]

I want to connect an Arduino Nano with an ESP8266 Wifi Module to send data to a Webserver. I think about using AT commands to the ESP8266 for connection and sending data. For that, I have started ...
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ESP8266-12 SPI Interfacing

I want to make an Interfacing between my pic microcontroller and the ESP8266-12 through SPI protocol, but i found two types of SPI in the ESP8266-12, the Hspi and on gpio 12,13,14 and another one on 6,...
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esp8266-01 problem

Hy, Can you help me with a problem. I build on breadbord circuit from atached scheme. If connect power supply the relay activate wichout send commend to esp8266. If dissconnect power supply and remove ...
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50 views

1117 Regulator outputting 4.2v

I have an esp-12 soldered on this breadboard adapter. I mounted a 1117 3.3V (not adjustable ones) regulator to the board and removed the 0 Ohm jumper resistor as instructed by the manufacturer. Using ...
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38 views

What can I use to switch a 500mA 12v inductive load from 3.3v Output

I have a ESP8266 that needs to switch a water valve that draws 500mA on 12V. What can I use to switch that load? Right now I think I will use a logic level Mosfet but I am a bit lost with choosing the ...
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How to do serial communication between 3.3V and 5V devices using THT components?

I know that there are many questions dealing with logic level conversion/shifting between 3.3V and 5V devices, but my goal is to do do this with standard breadboard parts, so either discrete parts or ...
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57 views

Am I using the right resistors with these MOSFETs for an ESP8266 controlled LED strip?

this is my first question here. I hope I don't mess it up. I made a WiFi controlled LED strip about a year ago. The LED strip is one of the "dumb" (no individual pixel control) 12V ones and I used a ...
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46 views

LM7805 Voltage Regulator stops working when input voltage increases

I have the following circuit: simulate this circuit – Schematic created using CircuitLab I designed the PCB, had it printed and now I am testing it. When I power it up the following happens: ...
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95 views

ESP8266 loses wifi connection on switching a load

I am trying to switch a roller shutter belt winder (RADEMACHER RolloTron Basic 1100) with an AI-Thinker ESP8266 ESP-12E module. As software ESPhome is used. Most of the time the ESP8266 loses its wifi ...
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42 views

How to determine if I broke a low-dropout linear regulator

I recently bought a cheap relay shield for an ESP8266 (01, the small ones.) These shields can be powered with up to 15V and contain an ET1117-3.3 voltage regulator on it, to properly power the ESP at ...
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36 views

Raising ground level of Wemos ADC from Multiplexer

The Setup I'm using a 74HC4051N multiplexer to interface with several analog sensors. I'm using a Wemos D1 Mini to read Z (output from the mux) using the Wemos ADC. I've only illustrated one (of 4) ...
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What would be the best/economical solution to detect an AC device activation?

I want to know when a device is turned on/off and generate some statistics. Microcontroller: ESP8266 AC voltage: 220V The first thing that came to my mind was using a power consumption sensor which ...
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29 views

PCF8574 and OLED SSD1306 I2C conflict

I have a ESP12 module which is connected to multiple I2C devices such as an 24C08 EEPROM, DS1307 RTC and a PC8574 expander. Everything works fine until I decided to add an OLED module to this setup. ...
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26 views

How does this board achieve snapability (ESP8266 programmer) for a SMD IC? [duplicate]

There is a programmer for the ESP8266 that allows you to snap the ESP module in and out of the board to program without soldering? I never seen this type of connector before, does anyone have a part ...
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30 views

Sharing ground with high current circuit

I'm designing an electrolysis machine controlled by an ESP8266 that also monitors the current and voltage of the electrodes with an INA226. There are two separates power supplies, 3.3V,1A power supply ...
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75 views

Two transistor switches on a dual coil latching relay

simulate this circuit – Schematic created using CircuitLab I have a small project in which I have an ESP8266-12E OUTPUT pin going through a 2N2222 transistor as a switch that energizes the set ...
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63 views

To which voltage rail should I connect pull-up resistors?

I designed a circuit which have some components with different voltage ratings. There is an ESP8266 which should connect to 3.3V. There are more components such as PCF8574 (Multiplexer which is ...

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