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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chinese wemos d1 board randomly connecting/disconnecting from USB

How can I find out why my wemos D1 mini board is randomly connecting and disconnecting from USB to PC? I got three boards from a chinese retailer. When I plug them in a PC and check device manager, ...
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43 views

Time Synchronization between stations over WIFI 802.11n

I'm working on a wireless (2.4Ghz WiFi 11n) project where multiple nodes (ESP32) send very small data to the AP, something like 40 bytes every minute or so. I need to maintain an accurate coordinated ...
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27 views

Esp8266-01 module attached to Arduino resets when DC motor runs

Machifit JT80SL DC 3-6V Water Pump: 3-6v Servo sg90: 3-7.2v Esp 8266 01: 3.3v I have 2 Arduino Uno both has their own ac-dc power adapter. Lets say, 1st Arduino ...
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ESP8266 and I2C

I want to read data from five equal devices via I2C. Master is ESP8266 microcontroller and slaves are five MPU5060. The problem is that they have equal addresses. I've seen a lot of answers about how ...
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30 views

Failed to connect to ESP8266: Timed out waiting for packet header

I'm trying to program ESP8266 Node MCU v0.9 using Arduino IDE. I'm trying to upload the most common sketch i.e. blink which is available in the examples of ESP8266. Even then I'm getting this error - ...
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72 views

How to rule out that you have a faulty power supply?

Just for context: I'm trying to code an ESP8266-ESP01 through an arduino, but I'm failing and my primary suspect, as per other forum issues I read, is that the power supply is the fault. I've tried ...
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42 views

Why does my MAX30105 give wrong temperature reading?

I am using a custom made board for the MAX30105 sensor. I am checking with ESP8266 Arduino (Sparkfun max301505 library.) When the sensor is on, the temperature reading is 10 Celcius. It ...
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37 views

Help with simple beginner circuit

I am hoping someone can help me with a circuit idea I have. I am wanting to build a door sensor with a reed switch and an esp8266. I was thinking to keep it low power when the Reed switch closes the ...
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52 views

What circuit simulators can also simulate ESP8266 and/or ATmega328?

I'm going to start soon some ESP8266 and Arduino Nano projects. I've used some simulators in the past, but none of them simulated these ICs. Dou you know if there is any simulator, that would also ...
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78 views

How should trigger the 5V Relay with ESP8266? Using PC817 or Transistor? What is pros and cons?

Working on product but want some suggestion from great community members: Best approach to trigger the 5V Relay from ESP8266EX WiFi Module. I attached both schematics. In Schematic 1, Relay is ...
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67 views

Please review design for a wifi controllable led driver

I'm trying to dabble a bit in circuit design. As a starting project, I've taken it upon myself to create little wifi controllable led drivers for a couple of (very cheap) light strings I own. The idea ...
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AC Dimmer circuit with MOC3021 & EL817 along with ESP8266 (NodeMCU)

Major two issues/question are here: 1) The challenge I am facing is, my interrupt is not working. 2) do I need to include a Heat Sink in this? Hello, I am quite ...
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Fail to reboot after recharge, ESP32/ESP8266 using a MPPT and 18650 battery

I try to build a solar energy operated project. I'm using an ESP32 to wake up every 45 minutes, measure bat's voltage using board's ADC, and send it to an excel sheet on Google drive. The part of ...
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41 views

How to control ESP-05 power using Arduino (both are 3v3 devices)

I have ESP-05 connected to Arduino Pro Mini. Both are 3v3 devices. I need Arduino to power on/off ESP-05 device using GPIO when needed. Please suggest. I tried to use N Mosfet but that did not work ...
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35 views

ESP8266 FTDI flash Timeout problem

I'm currently designing an esp8266-based board for a project. It has an LM317 for voltage regulation and the esp8266 is used to drive a RFID card reader (those RC522 reader board from china) and some ...
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42 views

NODEMCU _ MCP23017 IO Port Expander Schematic Design

I am designing a relay driver using NodeMCU and need additional IO Ports, therefore I have designed a schematic utilizing MCP23017. I think the schematic looks good, however before I order PCB's ...
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73 views

Why IR receiver at gadget not take the hex code?

I have an IR remote for a gadget, I am decoding the values using esp8266 Arduino library i get, Protocol: UNKNOWN Code : 0xD8396229 (129 Bits) uint16_t rawData[257] = { 536, 966, 544, 462, ...
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77 views

ESP8266 Getting Unstable with the following circuit

When the resistors in this circuit are removed, the NodeMCU is working absolutley fine, however when these are put, ESP gets unstable and the relays are flickering. Also unable to flash with these ...
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ESP8266-12E & BPM180 - Bad pressure retrieved

I have NodeMCU (esp8266-12E module) and connected BMP-180. I try to read pressure from BMP-180 in async web request, but it reads bad value. For testing purposes I log pressure in loop() - and it's ...
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43 views

NodeMCU-12E - Conflict between I2C and SPI

I have SPI SD-card module connected to nodeMCU, and it's worked well. Next I try to connect I2C sensor, and it doesn't work. Looks like SPI conflicts with I2C, because when I disconnect SD-card, I2C ...
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38 views

ESP12e: analog reading not working with voltage divider

I'm trying to read from an analog sensor (a capacitive soil moisture sensor). I'm using a ESP12E, not a development board, so the ADC pin can only take 1V max. Since my sensor can output up to 3V, I ...
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46 views

IRF520 as a relay driver

I am trying to use IRF520 as a relay driver for ESP32, but by reason unknown it does not works. I have replaced it twice with a new ones, but yet it keep not working. I have 3V on the ESP32 pin when ...
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82 views

Replacing an ammeter with voltmeter?

I have found this circuit of a millivoltmeter, and it seems like something which as a hobbyist I can do it, and the range of the measurement is very suiting one of my projects, but I would like to ...
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96 views

AC Nanovoltmeter for Arduino alike?

I have searched across web, but I am unable to find such a circuit. I am looking for a circuit of a AC nano-voltmeter in range 5-10 to 100 nV which output is suitable to be handled by some precise ...
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24 views

Esp NODEMCU powered from external 3.3v source and USB

My project supplies the NodeMCU with 3.3v from a battery source via the 3.3v input pin. I would also like to connect usb input for power and programming and to feed a small battery charger from the Vu ...
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ESP8266 auto-program circuit with DTR only and without RESET pin (turn off>on VCC only)

In the NodeMCU board, there's a very usefull auto-program circuit to avoid pressing buttons or change wires. This is the schematic: I have some ESP8266 already soldered on PCB and they does not has ...
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54 views

ESP8266 (Wemos D1 mini) analog thermistor

I'm trying to connect my floor heating thermistor (NTC) to ESP8266 (at Wemos D1 mini board). But I'm unable to get good results. I get an approximation formula from this table (after I input my ...
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87 views

ESP8266 3.3V and ADAFRUIT TRINKET 5V I2C communication

I try to learn I2C with this diagram as an exercise. I want to read my ESP8266 IO events from my 5V adafruit trinket. I2C MASTER ESP8266ex ...
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81 views

HTTP Post error using ESP8266 from Arduino

Using Arduino on an STM32F103C Blue Pill to drive an ESP8266 ESP-01 as shown below, and this tutorial: Arduino Forum I am attempting to do an HTTP POST with the following code: ...
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NodeMCU v.1 / WEMOS Mini - Fail to Wake up from deep sleep

I'm Trying to put to deepsleep a Wemos mini/ NodeMCU / ESP-01, and facing the same problem - fail to wake up. Looking around - I've found some articles such this ...
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60 views

Powering up an ESP32 with IO extender (MCP23017) and two of 8 channel relays from an external 5 V, 10 A power supply

I'm working on a project that needs an ESP32 board, IO extender (MCP23017), two of 8 channel relays and some sensors, I've powered up all of the parts from a stable 5 V, 10 A power supply as shown in ...
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51 views

ESP 01: Sketch uploading but not running

I have this ESP8266 I've been trying to get to work with a USB to TTL converter. I can flash the code through the Arduino IDE to the ESP8266 and it supposedly succeeds, but the ESP8266 isn't running ...
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What is RS-485 and MODBUS? [closed]

I understand the title seems too broad but it's a bit specific and I'm totally new to the communication stuff, so please bare with me. If the question is too broad, please provide some suitable links ...
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1answer
77 views

HX711 module VCC and no VDD

(Image source and more details: circuitio.io) I am trying to build the above circuit powered by battery alone. Sparkfun HX711 is expensive and hence I am using HX711 bought on Amazon. Here is the ...
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53 views

Covering PCB antenna with lacquer

In my project, I use ESP-12F module which has exposed (no soldermask) plated PCB antenna included in design. However I want my PCB to be waterproof and cover whole thing with waterproof lacquer. My ...
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24 views

Using ESP8266 to read digital input pin to be notified when motion is detected from 24VDC source device

Software developer here, trying to mess around with hardware (VERY NOVICE) and implement neat things around the house using ESP8266s and Arduinos. I have a commercial wall plug that is activated when ...
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39 views

Esp 8266 - 01 module unable to flash or communicate

I have an ESP8266 module which is not communicating with the Arduino IDE serial monitor unless I press the rest button on the ESP setup. I tried erasing and reflashing the ESP8266 several times, but ...
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ESP8266 Restarts When A Motor Is In Use

So I'm working on my Senior Design Project currently. We are building a circuit with the ESP8266 Microcontroller that is connected with a Motor Driver to control a motor. The issue that we are facing ...
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33 views

Entering to program mode in ESP8286

Trying to upload programm from Arduino IDE to ESP-WROOM-02 according description. I tried to enter program mode by following procedure below: ...
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2answers
59 views

Powering mixed 5V and 3.3V circuit from AA batteries

This my first more-serious project :) I want to integrate a 5V (air dust) sensor with my ESP8266 IoT gizmo running on 3.3V (we can call it a DIY weather station). I've bought a sensor with Vin spec ...
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34 views

How does the external antenna in ESP 8266 modules work?

I want to test the downloading and uploading speeds from various antennas of my choice via an ESP8266 microcontroller. I came across this design which I was planning on using for this. This would be ...
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65 views

Floating analog input value

To use my sensor I need to supply 24V. So I converted 4.5 V from battery pack to 24V and converted it again to 0-1.66V using a voltage divider. So far I can read the output of the sensor using the ...
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17 views

Nodemcu controlling a button on a pcb?

So i am trying to connect this button with a Nodemcu esp8266 (the push button on the bottom side of the pcb in the picture) Can anyone help me to wire this to a esp8266? Also i measure 3.3v whether ...
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52 views

How to select external components for LM2596-3.3V?

I want to power an ESP8266-12F with a 12V power supply. The 12V power supply is also used to power a led strip. I need to step down the 12V to 3.3V. The maximum load is 1A. I found the LM2596-3.3V to ...
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69 views

what is the maximum ESP32 app code space for 16mb flash?

I am using esp32 dev kit with 4Mb memory Arduino IDE I have noticed when wifi example is running almost 50% of program space is used. after some research, I have set memory configuration to no OTA/...
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71 views

Simple low power rising and falling edge enabled circuit

I am working on a project where I use an esp8266 and a reed switch sensor (NO), this is powered by a battery so I need a low power circuit that can turn on the esp8266 when the state of the reed ...
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How to power multiple Wemos D1 Mini

I’m planning on making my bay window blinds tilt automatically with Alexa. I've done plenty of research but can’t find my answers, hence the question. I have 4 individuals blinds which all need ...
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2answers
131 views

3.7v to 3.3v voltage regulator [closed]

I want to use a 3.7v lithium-polymer battery to power a esp8266 wifi module in a mechatronic project. This module works with 3.3v and I'm not an electronic expert so I use modules to avoid mistakes ...
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62 views

Is it necessary to opto-isolate a darlington array output?

I've got the following circuit going: A Vishay opto-isolator (CNY74-4) that takes input from buttons that work on 24V, and outputs to microcontroller pins (an Olimex ESP32-PoE-ISO in my case). A ...
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60 views

Switching 12v pilot with 3.3v logic

I have an entry gate pilot operating on 12v. I would like to connect it to my esp8266 (3.3v) to control it over the WiFi. I would like to use 12v power line which I already have. The components which ...

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