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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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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Integrate Nextion T4832 with Tasmota Firmware

I am trying to Integrate Nextion display with Tasmota, to use the display as HMI. As per Tasmota, there is some support for displays, however i am not sure how to get it working. Any pointers, ideas ...
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36 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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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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72 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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73 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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39 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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34 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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39 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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79 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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93 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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37 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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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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74 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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24 views

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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56 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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43 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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90 views

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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61 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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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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36 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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30 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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55 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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33 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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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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50 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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62 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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70 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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118 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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59 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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58 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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679 views

Linear regulator doesn't keep the right voltage when connected to ESP8266

I am trying to use a MCP1700-3302E LDO to regulate voltage from single-cell LiPo battery to my ESP8266 (Wemos D1 package). I intend to use the LiPo down to 3.5V, and since ESP8266 requires 3.3V, that ...
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53 views

Is the parasite mode of a DS18B20 less power consuming than the normal mode?

Description I'm trying to make a few small temperature sensors for in our house and want to go for "low powered battery operation". My current plan is to use esp-now in the esp8266, deepsleep ...
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55 views

HX711 and 3 load cells

I am doing a small project with ESP32 and HX711 and I need to have 3 load cells. Like this one: I am totally newbie in electronics, my ground is programming. What I found are projects with 1, 2 or ...
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45 views

Get signal from apartment intercom to know when someone ring

In my apartment I have an old intercom to know when someone is at the entrance of the building and to unlock the door. I waned to connect it to an esp8266 to let me know remotely if someone ring and ...
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41 views

Is it safe to run esp8266 on 3.76V for long run?

I have made a Circuit for home automation and have discovered that my esp8266 is operating on 3.7--3.8V . I want to ask is it safe to use it at this voltage or I have to step it down to 3.3v for a ...
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49 views

Can the MINI Wemos D1 ESP32 handle 5v on its GPIO pins?

I need to connect multiple data and address pins of a Z80 processor, which runs like the rest of my circuit on 5V, to the gpio pins of a mini wemos D1 Esp32. But I am not sure if the wemos can handle ...
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74 views

2n2222 with 12v 8mA [closed]

I have a circuit running on 12v 8mA and I want to get a signal to a GPIO of an esp8266 when current is running. So for that I tried to use a 2N2222 transistor with vcc of the circuit going to the base ...
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54 views

Using multiple sensors on the same i2C circuit

It’s possible to control multiple pH probes with one single i2C ph circuit (like this https://www.atlas-scientific.com/product_pages/circuits/ezo_ph.html) ? Rather than buying I2C circuit for each ...
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23 views

TUHS3F05 without other components

I'm planning to use TUHS3F05 for my ESP32 project. I'm very space limited so I need to optimize place as much as possible. In datasheet it is recommended that TUHS* it should be used with other ...
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52 views

ESP8266-01 Deep Sleep

I have a question regarding the ESP8266-01. Do I need to solder a wire from GPIO16 to reset if I am using a button to wake the ESP module from deep-sleep mode ? Or is it needed only if the module ...
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29 views

ic to drive either one pwm signal or another

I have an existing RC circuit for a toy truck. Obviously it already has its own mC to receive the antenna signal and output a PWM signal to a motor driver IC. I want to be able to ALSO control this ...