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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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0answers
26 views

WS2812b LEDs intermittently do not respond to data signal

I have wired up permanent holiday LEDs on the front of my home, using a 5V 60A power supply and several strips of WS2812b's (generic Neopixels), controlled by a Wemos D1 mini. The Wemos is powered ...
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0answers
11 views

SimpleDHT: what does error code 4112 mean? (not in source code on GitHub)

I am using the SimpleDHT library, running on a ESP8266. Occasionally I get error code 4112 on serial output. The variable that holds this error code is declared as an int. However, the source code ...
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31 views

110v AC “Low voltage LED lights dimmer” controlled with DC 3V3 [on hold]

I'm new to Electrical Engineering and this is a hobby for me, appologies in advance if this is a dumb question. I want to control a 110v LED lights that are dimmable. I already have in place sa ...
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1answer
20 views

WiFi IC with minimal controller features [on hold]

I do not want to program my esp8266. Are there any alternatives to it with lesser controlling abilities (I/O lines, Flash, etc)?
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24 views

nRF52 Bootloader over ESP12E

I'm using nRF52 DK with 14.2.0 SDK. I created a LED blink project for testing and extract its HEX file. I uploaded the program to the nRF52 over USB (J-Link-Keil IDE) and the HEX file over ESP12E (SWD)...
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1answer
31 views

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: ...
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0answers
71 views

What's the required voltage for ws2815? [migrated]

I am working on ws2815 led strip with the esp8266 on arduino 1.6.6 fast led library.Using CD40109B level shifter to convert 3.3V of esp output to 12V .It's working fine upto 31 leds according to the ...
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59 views

Turning on/off power to NeoPixel Ring with MOSFETs from ESP12-F

I am creating a pcb with ESP12-F which will contain Neopixel Ring 12. As this will run 24/7 and Neopixel even when completely off drains about 15-20mA and I will have several of those the consumption ...
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1answer
33 views

ESP 12F does not return OK on AT

I have small ESP 12F (ESP8266) module and I can not get it to work. I have used many other modules like Wemos successfully, I can program. I understand that for very basic functionality test the ESP ...
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1answer
58 views

Why does making this change to my DHT11 code cause it not to work?

Note: This might not be a programming question. If it turns out that it is, I will close it. I am using an ESP8266 to build some air quality web servers. One of the sensors I am using is the DHT11 (...
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0answers
56 views

4-pin PC Fan PWM control and speed monitoring

I want to control and monitor the speed of a 4-pin PC fan using an esp8266. When there is no PWM control signal sent to the fan from the esp this code reports the fan speed correctly. However, ...
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37 views

How to interface esp8266 wifi module with nuvoton m058ldn micro controller? [closed]

I'm on internship in one of the embedded solutions company. They gave me a task to interface esp8266 12E module with nuvoton m058ldn. I could not able to find any document in internet but i saw one ...
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17 views

ESP8266 using with chat API [closed]

I'm pretty new to the ESP8266. I was wondering if there is some way I could connect using ESP8266 to Facebook messenger (my account) and display my latest messages (for example) let's say on the ...
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1answer
35 views

GPIO of ESP8266 without base resistance

I know that the maximum output current of a GPIO of the ESP8266 is 12 ma I have seen the next circuit and I have done it, it works perfectly, I have measured the base current and it gives 10 ma My ...
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0answers
15 views

Why wifiManager.setTimeout(60) is not working? [migrated]

in this code I am using wifiManager.setTimeout(60); so that when it fails to connect to the wifi it should restart. However, wifiManager.setTimeout(60) is not working at all. It get stuck and display ...
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1answer
59 views

How can I attach a custom built antenna to the NodeMCU (ESP-12E)

Is there any possibility I can disable/remove the PCB antenna and replace it with a custom one, like a directional helical antenna? Can I just solder it on? I am an absolute beginner and have no real ...
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0answers
124 views

Arduino: incorrect calculation of long integer [migrated]

I'm doing a simple calculation with integers (on Arduino with ESP8266 12E), but I can't get the expected result and can't find the error. Can someone guide me? ...
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1answer
29 views

Help with supplying 3.3v to ESP and temperature/humidity sensor

I'm new to electronics. I've built this: It's an ESP-01 Wifi chip and a DHT22 temperature/humidity sensor. Now I'd like to power it with batteries instead of an Arduino. The ESP-01 requires 215 mA, ...
1
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1answer
47 views

ESP8266 not running uploaded Arduino sketch

This is my first time using an ESP8266 WiFi module, and I'm having a lot of trouble just setting it up. My goal is to get the module to run a simple Arduino Blink sketch so that I could proceed to ...
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0answers
31 views

ESP8266 WiFi relay module constantly switching on/off the moment power adapter is connected

Totally new to this. Tried googling and watching some youtube videos but can't seem to find anything that can related to my case. Do let me know if I'm doing something wrong. I bought my module from ...
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0answers
54 views

Can I bypass the LDO regulator on a Wemos D1 mini esp8266 board

I have found a couple of entries on this site but I can't apply the answers to my particular situation. I tried this option Power Wemos D1 mini from battery but it doesn't take long for 3xAA ...
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1answer
66 views

Can someone explain this schematic and how to modify it to add PWM LED dimming?

I bought a LED bulb (AC175-265V, 7W, 59mA) to made some experiments with it and inside there's this circuit: Can someone explain me how this circuit works? The small transformer package with a single ...
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0answers
24 views

ESP32 - MCP2200 Bridge for Programming

I am quite new to PCB design and hardware (I am a high-level coder for my day job and Java/Android/SpringBoot at that...) and have come across the ESP32-WROOM board and want to incorporate it in to a ...
2
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1answer
38 views

Wake ESP8266 based MCU on contact close/open

I am trying to build what I thought was a relatively simple system (think deadbolt detector), that will fire an event when a simple switch changes state. Currently, I am testing with an ESP-01 and an ...
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0answers
28 views

How to add ethernet connectivity to an existing wifi project

I have been working with the ESP8266-01 wifi module for sometime now. I have managed to send data from an arduino uno board to a webpage via the module. The module runs the AT firmware and from what I ...
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1answer
29 views

How to stop erroneous signals on startup of an RF circuit

I have a really janky setup where I'm using an ESP and some transistors to "push" the buttons on an RF remote control, used for controlling electrical outlets. The circuit works perfectly during ...
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0answers
27 views

Huzzah ESP8266 board upload stuck

First off, I'm a noob at this. I want to do this project: https://learn.adafruit.com/huzzah-weather-display/overview and I did everything except uploading the code. I use Arduino IDE and when I try to ...
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1answer
39 views

Start ESP (Wemos D1) for short amount of time by pressing a button (no deep sleep)

How can I let an Wemos D1 boot on a button click, letting it execute an action and then shut down. I would like it to be wireless so it can be very flexible, and would love to not have to worry about ...
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1answer
30 views

Control ESSP8266 IOT board over cellphone hotspot wifi [closed]

I am using the following code in order to control my ESP8266 using my cellphone hotspot. ...
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0answers
79 views

esp32 resets when relay switches from ON state to OFF state

When I switch a 12v relay from ON to OFF using esp32 then the ESP is restarted. Also it happens only when there is an AC load. I control 12V relay with a transistor. This is my relay How to solve ...
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1answer
52 views

Voltage divider Vout not powering ESP8266 [duplicate]

I have an input voltage of 12V from my power supply and i need 6V to feed into the ESP8622. I was giving it all the 12V but the wifi module becomes increasingly hot with time and so i decided to have ...
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1answer
88 views

What if I connected +5V from one source and GND from other to arduino [closed]

I'm just asking... What if I connected +5V from one source and GND from other to Arduino Will it work? EDIT simulate this circuit – Schematic created using CircuitLab Will it work? or ...
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1answer
47 views

Programming esp8266 NodeMCU (with Arduino IDE)

I just got some esp8266 NodeMCU chips, which I want to use for IoT. I understand that these chips are programmed with Lua code. Is this correct? I found online that I can program these chips with ...
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1answer
83 views

What components do I need to add to the power circuit for this ESP8266 project?

I'm planning to make some controllers for each of the electrical heaters in my house. The heaters use a pilot wire to control their mode of operation: I'm following this project to control the pilot ...
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2answers
55 views

Impedance-matched antenna with an extra capacitor

I'm looking at the a schematic for an ESP8285 module, and I am curious about what they are doing with the antenna. The module is the PSF-B85 (by ITEAD: the version with a chip antenna). The antenna is ...
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1answer
58 views

Schematic failure in I2C connection

Hi, I've built the schematic shown in the picture. It is an ESP-12 module that should communicate via I2C to the MPU6050. However, the communication seems to be disturbed. The clock and data line ...
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1answer
92 views

How to send data to an ESP32 with as little delay as possible from an Android app [closed]

I have an ESP32 module. I want to send data to it using an Android app. I tried using http but the delay is big especially since I want to send about 20 values per second with a delay between 50 to ...
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1answer
78 views

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 ...
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1answer
29 views

ESP-01 boots with GPIOs HIGH

I'm trying to implement a "button pusher" with some transistors controlled by an ESP-01 module, to push buttons on a remote control. I'm having an issue where if when the GPIOs (I'm using 0, 2, and 3) ...
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0answers
22 views

ESP32 WROVER- How do you force a SEND FAIL

Good day all, How do I force the ESP32-WROVER module to display a SEND FAIL after not receiving a message string after the >? The problem I am having is that in my application I don't want to close ...
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1answer
79 views

Registering IOT products across Europe based on NodeMCU

We've been designing some smart home devices and softwares in past few years and they've been sold in some countries in middle-east. Basically, they were combination of ESP, Arduino and NodeMCU boards ...
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2answers
142 views

ESP32 max input voltage UART

Before doing any mistake, can you confirm me that it is not possible to connect directly UART pins of Arduino UNO on UART pint of ESP32 ? I see on the datasheet a voltage of 3.3V. I would like to ...
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0answers
54 views

How to make this circuit to use a single USB for programming and charging?

everyone, I am making a simple circuit with a led strip (ws2812b) 1 using a wemos d1 mini clone (esp8266) [2] and a lipo charger usb module (TC4056A) [3] here is the breadboard diagram in fritzing: ...
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2answers
63 views

ESP8266 - PULLUP resistor using Arduino code

I'm having some trouble with this ESP8266, to switch UP, DOWN, OFF dual relay, using Arduino code and a physical 3 states switch. The code defines input GPIOs 12,14 as ...
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1answer
61 views

button which wakes up the esp8266 from deep sleep, but can be used as common button

The goal is to have a button which wakes up the esp8266 from deep sleep, but can be used as common button while the code is running. This is a follow up of an unsolved Arduino SE question. esp8266 ...
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0answers
107 views

Waking up an ESP8266 using an MPU6050 accelerometer not working

I am trying to wake up an ESP8266 from deep sleep using an MPU6050 interrupt. I am using Micropython to configure MPU6050 to generate a 50us pulse (active low) on motion and connect it to the RST pin ...
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0answers
71 views

What damage occurs in an ESP32 when you power it with 5V

A colleague flashed the PIC MCUs on a batch of boards. However he didn't pay attention to set the Vdd when programming to 3.3V and used the default (5V). This caused the ESP32 on board to experience ...
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1answer
67 views

Hook up 2 HC-SR501 PIR's to Wemos D1 mini

I have two HC-SR501 PIR's I'd like to use to detect motion and light up a 12V LED strip when motion is detected (each PIR is assigned a LED strip). I am, however, unsure on how to hook them up to my ...
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1answer
127 views

Why doesn't Arduino Nano provide enough current to ESP8266?

I have an ESP8266-01 WiFi Module and I have some troubles in supplying power to it. I use an Arduino Nano powered by a 9V battery (actually 6x 1,5V AA) through the Vin pin and the GND pin. I power the ...
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2answers
126 views

Can I use series diode to drop voltage from Lithium Ion battery to ESP8266?

Ideally I would use a low dropout regulator but I can't. I also don't have access to a suitable buck boost converter. The best alternative I have (and also my plan B) is to boost the Li-ion battery ...