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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Issues programming ESP12F

I used this wiring schematic for a couple of my ESP8266-12F projects for programming mode: As I built enough confidence with the module, I decided to go ahead with a PCB design. When I try to upload ...
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How can we use TCP for sending realtime data sampled at 10kHz? [closed]

My system samples vibration data at 10kHz frequency. These realtime samples are sent to the server using an ESP8266 with UDP communication. An ATmega328P is interfaced with the ESP8266. Sampled data ...
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Driving an RGB LED Strip with an ESP8266

simulate this circuit – Schematic created using CircuitLab That's my circuit, although it's an RGB LED strip that I'm driving, rather than three individual LEDs. It works. I can PWM each channel ...
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Is it possible to increase the current of an Arduino Nano 3V3 pin without altering the voltage?

I am trying to use an ESP8266 with an Arduino Nano but I see that the NANO can not enough current for supplying ESP8266 from 3V3 pin. I think it is limited from the faactory. If I use the 3V3 pin RX ...
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Do I need RTC while I'm using NTP?

We know computer and another device like microcontroller is not accurate in ticking clock comparing to wall clock that using cesium atom. I heard RTC module is purpose to making accurate the ticking. ...
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SR latch circuit with ESP8266

I want to keep some state during a deep sleep of an ESP8266. To do this I used the following SR latch circuit: It works well. The only change I made is that I used 2N2222 transistors. The only ...
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Gardena Battery Rain Water Tank Pump 2000/2 - UART Interface

I have a garden and would like to water it automatically with rain. For this i buy a «Gardena Battery Rain Water Tank Pump 2000/2» and would like to control via an ESP8266. After opening the control ...
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Unidirectional level shifter 1.8-5V -> 3.3V

I'm looking for a circuit/IC to shift logic levels between 1.8/3.3/5V and 3.3V. This is to connect various devices via UART to the ESP8266. As such, I only need unidirectional translation - the ...
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Interfacing LCD via SPI

Problem: I am trying to figure out how to interface an LCD via SPI. What is known: It is 80x32 dot matrix. There are 23 pins on a flex cable. The pinout. I'll put it below. The LCD is marked with red ...
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LED strip flickering at low brightness, using ESP8266, IRF510 MOSFETs and 12V power

I have a very simple circuit, where the ESP8266 controls a non-addressable 12V RGBW led strip. I works properly at normal and high brightness, but when I set the brightness to low, the LED strip ...
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Circuit to control a motor using relays

I want to do an automatic door for our chicken coop. The battery part is done (a small solar panel, an old car battery and a solar charger). The issue is with the door itself. I have a door actuator ...
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Connecting different voltage sensor

I have a very basic question. I have a esp8266 device that needs to read from an analog device. the device runs at 24V, and the ESP at 3.3V. Should I connect both grounds? This is the schema:
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Powering D1 Mini through 5V pin

I am trying to power a D1 mini (ESP8266) through the 5V pin (not using USB port). I have a 9V transformer connected to a 5V Regulator (5V Regulator) I have set the regulator at 5.42V when there is no ...
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AMS1117 3.3v overheating with ESP-01 and 5v input power

in our "smart home" I want to integrate the gas consumption into the home server. The gas meter emits a magnetic pulse every 0.001㎥ gas consumed. I have designed the following circuit, to ...
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CAT809 (MAX809) Doesn't give a steady signal when battery voltage recovers

Actual used part: CAT809RTBI-GT3 I have the CAT809 connected to EN pin of ESP8266. The board is powered by battery. So when the voltage is going down everything work as expected and the CAT809RTBI-GT3 ...
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Esp8285 not working

Hi my custom board for esp8285 isn't working, does anyone has idea what went wrong? I'm looking for error in schematic
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How to measure voltage of a system with a different GND reference?

I want to measure and log the voltage of a "closed" system shown in the following schematic on the left side. This system has its own reference to GND which is not connected to the ...
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esp8266 reading from envir current cost monitor seeing garbage characters on serial port (rpi reads without the unknown characters)

I'm trying to read the output of a current cost Envi-R monitor which outputs well spec'd xml over serial. I have connected the Envi-R TX and GND to my esp8266 (a nodemcu dev board) and the xml can be ...
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Capacitive moisture sensor and need of voltage regulator

I am trying to build a (capacitive) moisture sensor with ESP-01S, my goal is to measure the soil moisture level, send it via wifi to a server (estimating 10-15sec execution time) and finish it off ...
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Circuit design for ESP8266 serial communication with a one wire UART garage door opener

Chamberlain/Liftmaster garage door openers have a button which is connected to the opener with two wires. One wire is ground, the other 9600 baud serial UART data with 12v logic. This line also powers ...
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I2C Slave pulling SCL LOW and not returning data

I'm trying to interface the OMRON D6F-PH0025AD2, BME280, and a 2004 Display (with an I2C driver) with an ESP32. Without the D6F on the I2C lines, the others peripherals work perfectly. Following the ...
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Measure AC (24VAC) current with 3.3 MCU

I'm trying to use the following circuit designed by someone else : VCC = 3.3V It's aparently adapted from this one: Taken from : https://github.com/OpenSprinkler/OpenSprinkler-Hardware/tree/master/...
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ESP8266 with on and off control via MOSFET

I would like to connect to internet an intercom in my home. For it, I will use an ESP8266 (ESP01-S), one MOSFET, and one optocoupler. When one person touches the button, the optocoupler connects ...
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How can an ESP8266 (80 MHz) read/write to WiFi (2.4 GHz) when its clock is only 80 MHz?

I don't understand how an ESP8266 can use 2.4 GHz WiFi when its clock is less than this. This question came to me because when looking for a microcontroller. I always find it weird that 400 MHz+ is a ...
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Circuit that can support incandescent or LED bulbs

I have a project using an ESP8266 to control a lamp socket. In very simple terms the sketch switches the lamp socket on or off based on some conditions. The sketch works fine. What I would like to be ...
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Use CAT 5 cable to control LED with ESP-12E

I plan to use the ESP-12E's GPIO pin to dim a 12 V LED strip wire and control a 5 V [WS2812B] 1 panel via CAT 5. I tried using a 10 ft CAT 5 cable to link the ESP12E pin to the DIN pin on the WS2812B ...
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ESP8266 D1 mini pro/ Arduino IOT, no function is getting called

I coded this: ...
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ESP-WROOM-02 is not responding to AT commands as expected

I using the ESP-WROOM-02 (esp8266 core) as WIFI module and the Arduino nano IOT 33 (samd21g18) as main processing unit. I flashed the ESP-WROOM-02 via the ESP flash download tool with the AT Firmware ...
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ESP-WROOM-02 SPI config not working as Slave

I tried to config the ESP-wroom-02, which have an ESP8266 core, as a SPI slave. But didn´t found much information about SPI configuration besides the technical reference ESP8266. The project have the ...
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Will my design work to program an ESP8285 IC?

Will this design work to program an ESP8285? I was trying to design an ESP8285 development board for the first time. Before sending the design to manufacturing I would like to know whether or not the ...
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Modbus over RS485 - no response from device

I am trying to connect to Epever Tracer AN Solar Charge controller from ESP32 using below Max485 module but I can't get any repsonse from device. I was trying to use exactly the same setup mentioned ...
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Why pcf8574p worked well with Arduino but not with esp8266-01S

It seemed that ESP8266-01S does not work smoothly with PCF8574P (Dip16) but PCF8574T/AT (SOP16) does. Evidence as following: Code for blinking a led connecting to P7 of the PCF8574 was just simple <...
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Can an RC receiver antenna work for an ESP8266?

I will be building a project that uses an ESP8285 based ESP01F board (kind of ESP8266) and I need an antenna for this module. The antenna I need should be very light and thin so I thought of using an ...
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Digitally detect blinking LED

I have an appliance that has a blinking LED when turned on. I want to detect this blinking LED using an ESP microcontroller. The digital input of the ESP should be HIGH (or LOW) when the LED is ...
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1 vote
4 answers
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5V relay stuck sometimes

I have 5V relay circuit to control 3 220V fluorescent lamps using ESP-01. What I found sometimes the relay get stuck on "ON position" randomly. I have multiple of these around my house. I'm ...
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Home automation schematic check

I've just designed my first schematic to use as a standalone water tank monitor powered off 12 V. Is there anything obviously wrong with it, or are there any suggestions? The water sensor is 2 wire 0-...
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2 answers
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STM32 and ESP8266EX Flash Programming

I'm a complete beginner to electronics, I have done few projects using different modules, it's so easy to do with modules. Now I want to learn and do some advanced hobby projects. So I decided to ...
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Why am I having communication issues between ESP12F and ATmega328?

I am working on a PCB to enable an ATmega328 to connect to an MQTT network through an ESP12F. I am using a voltage divider in the TX line from the ATmega to reduce it to 3.3v (using nets SR+ and SR- ...
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5 votes
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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. Very glad to find an useful answer to this question: How do I detect ...
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Limited WiFi with NodeMCU

I am using the following code to connect with the WiFi router: ...
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Connect analog sensor 12 volt to esp8266 Arduino

I need help how to connect analog fuel Level sensor 4-20mA running on 12V DC to A0 pin on esp8266, the main problem is the large difference in the voltage difference between sensor (9-20 VDC)and ...
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Two digital pins for reading buttons, writing to RST

I have an ESP8266 with two buttons connected to pulled-up GPIO4 and GPIO14. The buttons pull the signal down if pressed. I want to reset the microcontroller on every raising edge. I thought about ...
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4 votes
1 answer
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ESP (ESP8266/ESP32) Mosfet switch problem

My aim is to automatically power off the ESP by turning off the pinout. When I test the circuit I get the out voltage 1.6 V when I assume to get 3.3 V. What I'm doing wrong?
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Console of ESP01 flashed with Micropython 1.17 can't be accessed

I was able to flash my ESP01 (1MB of Flash) with micropython: ...
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Erratic pull-up on ESP8266 UART

I have a logic-level UART connection between an STM8 and an ESP8266. The STM8 Tx goes to the ESP Rx through a 1 kΩ resistor, so that I can override the STM8 signal when I want to program the ESP8266. ...
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Micro Controller test if external circuit is powered

I'm new to electrical stuff, so thanks in advance for all help. I'm trying to control a window air conditioning unit with a micro controller (ESP8266), and I want to know if the AC is powered on. I ...
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Are there any errors in this schematic?

I am trying to make my own board based on the Wemos d1 mini v1. This is the original schematic - And this is what I have so far for my custom one - If you see any errors, I would much appreciate ...
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Driving Relay using ESP-01 Module

I am trying to control a 5V relay with a push button with an indicator LED using GPIOs 0, 1 and 3. I have pulled up the GPIO0 and using it as output, so that when I drive it low, the LED should glow, ...
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1 answer
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How to catch signal in ESP8266 when someone rings (doorbell)

I'm actually a software developer and new to electronics and ESP8266 etc. I want to learn electronics and my first project would be to catch the signal within ESP8266 when someone rings / uses the ...
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5 votes
3 answers
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Controlling Relay using ESP8266 Module

I have 5 such relays attached to an ESP-12E module with a 600ma Power Supply. The LED (LED4) glows but the relay doesn't switch. Is there anything wrong with my schematic? Using MMBT3904 instead of a ...
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