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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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1answer
414 views

RobotDyn dimmer controlled by ESP 07 only results in flickers

I use a dimmer module connected to an ESP07 which has Node MCU firmware. I'm using the Z-C interrupt to skip sinusoidal pulses, however I only obtain flickering instead of dimming. The light is bulb ...
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2answers
261 views

LED Hissing issue with circuits [closed]

I have just recently designed and manufactured my very first PCB with the goal of it being a dedicated circuit to my project. I developed an ESP8266 WiFi Mood Light, but the problems I currently face ...
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2answers
669 views

How to measure True Power (Not Apparent Power) consumption in Alternating Current using ESP8266-12F Microcontroller?

Currently, I am using the ACS712 current sensor module for measuring the peak current then computing RMS Current and thus the Apparent Power (Vrms × Irms = Apparent Power). Currently, I am not using ...
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3answers
300 views

Drive 24V input (active LOW) using 5V microcontroller

I have a device that is activated by grounding a pin that is pulled up to 24V. I want to control this using a microcontroller (ESP8266 which operates at 5V) using as little components as possible (no ...
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1answer
58 views

Do I need to connect the battery to send data to an ESP32 chip?

This may be a basic question, but I'm really new to electrical engineering. I got an ESP32 chip with no micro-USB port. I got with the device a 3-Wire cable one side and USB other side. I have to ...
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3answers
509 views

Can I get some opinions on this design please

Before I start, I totally know that I could buy one of these, I don't want to. I'm building a simple circuit that will allow me to use an ESP8266 (I have the -01 variant) to control my big shop ...
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1answer
65 views

newb to arduino, how to navigate the ESP8266 vs ESP32 examples and tutorials?

a big thanks to the many before me creating this space and solving many questions. I've been learning ESP32 (currently using ESP-WROOM-32 board) while I've found tutorials specific to this board, ...
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2answers
1k views

Low pass filter with two capacitors?

I'm trying to drive a speaker from an ESP8266 for a project, and found an article suggesting (ab)using I2S as a 1-bit Pulse Density Modulation DAC. Apparently that's pretty noisy, so the article gives ...
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1answer
708 views

Electrical noise resets & chattering in relay modules using ESP8266

I am trying to build my own SONOFF like device by using a Wemos D1 mini and associated circuitry. I am facing an issue with electrical noise where whenever switching of the relay causes chattering ...
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4answers
445 views

Driving 10W RGB LED Red Channel Issue

Been a while since I have been on here but I do not know where else to turn for help! This is more of a hardware issue than anything so i do hope that I am in the correct forums to be asking, if ...
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2answers
5k views

Monitoring Battery voltage using ESP8266 thinig dev board?

I have ESP8266 thing dev board. I am trying to measure battery voltage and send it to ThingSpeak. I have two questions: 1) DO I need a voltage divider connected ? 2) I googled but couldn't exactly ...
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1answer
57 views

Logic-level MOSFET not varying drain voltage [closed]

I have a series of FQP30N06L logic-level MOSFETs connected to a 3.3V logic controller. I am feeding the MOSFETs a PWM signal in order to vary the drain voltage, however, I am only experiencing a ...
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2answers
139 views

Designing an IoT product [closed]

This is more of a general question of the embedded electronics industry. At the moment I'm planning on building a device with a similar requirement to the Nest products. Essentially, I want to have a ...
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1answer
1k views

How to post multiple values to ThingSpeak?

I am able to store and access data in internal memory of RTC ESP8266 thing dev board. Now I am trying to loop the data stored in internal memory and post data to ThingSpeak. However, I am only able to ...
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1answer
677 views

How to fix the error “Response code 0” to get “Response code 202” to bulk update a thingspeak channel?

I am using this example: https://www.mathworks.com/help/thingspeak/continuously-collect-data-and-bulk-update-a-thingspeak-channel-using-an-arduino-mkr1000-board-or-an-esp8266-board.html According to ...
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3answers
227 views

PIR sensor outputs HIGH for too many seconds

I've a pretty simple set up which consists of a PIR sensor and ESP8266. This PIR sensor outputs a HIGH value when presence is detected. This HIGH value lasts for 8 seconds. I want this trigger to ...
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0answers
518 views

Connecting multiple esp8266 offline

I am planning to setup multiple esp8266 in my home to control electric appliances offline using browser. I want to connect to single esp8266 as a controller(Master) using browser/mobile and all other ...
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2answers
365 views

ESP8266 I2C Multiplexer

EDIT: I ran an i2c bus scanning program and it detected a device at 0x70 (the mux). I connected the device I am trying to interface with directly to the i2c bus and ran this code and it worked ...
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1answer
94 views

PCF 8591 switch using transistor

I'm using a PCF 8591 ADC for the sake of the photo resistor on it - here. The project doesn't seem too complicated for a software engineer like myself but I seem to need some help. I'm using an ...
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1answer
310 views

H-Bridge: forward and backward dc motor with ic 555 by esp8266 gpio

Searching on web for make h-bridge to forward and backward dc motor with ic 555 by microcontroller ESP8266 GPIO (PWM), i found some helps and i did this circuit: This circuit always stay with +3.95v (...
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1answer
87 views

Powering an object with a relay (has continuity but it doesn't seem to be delivering any current)

I am trying to learn how to control a relay to power various household objects. I bought a power relay shield for an adafruit feather huzzah (esp8266), and I have just set up the arduino blink sketch ...
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5answers
3k views

Is this a sensbile way to switch a 12V line with 3.3V logic

I am just starting to learn about making electronic things, so this may be a foolish question. I think this is adequately different to similar questions here. As a first project I am working on ...
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0answers
28 views

BMP180 ERROR read

I have a project with an ESP8266 and a BMP 180 Following this code The first read is everything okay ..but after just 214° celsius Temperature = 22.70 Celsius Pressure = 102686 Pascal Temperature =...
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0answers
275 views

Using 2N3904 NPN for audio amplification

I use a great library ESP8266Audio for play audio using ESP8266. As the author explained we can use 2n3904 for audio amplification as follow: ...
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1answer
369 views

How to implement AES Encrypting for ESP8266 implemented on Hardware?

I need to write a basic encryption program for ESP8266. I did read the datasheet (https://www.espressif.com/sites/default/files/documentation/0a-esp8266ex_datasheet_en.pdf), and them says that existis ...
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0answers
142 views

How to connect electric door bell connection to Node MCU

I have a electric door bell ( which is powered with Double AA batteries) , when the visitor presses it , it rings , plain simple . I am thinking to remove the electric bell , and feed that input to ...
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0answers
47 views

ESP8266 + Logic inverter on Tx = Failure to boot ?

I'm programming an ESP-12E module using the Arduino support package. My setup requires a logic level inverter on the Tx pin (only). I built the following which is working OK : simulate this ...
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1answer
80 views

Power relay makes ESP 07 to reboot(trying to control an electrical motor)

I have a 5V electric motor powered by a 220V-5V adapter. On the command side I have an ESP07 that controls the above motor through a relay. If I put the relay before the adaptor(220V), the esp works ...
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2answers
578 views

What is a ESD tube?

In the ESP32 datasheet, what do they refer to with "ESD tube"?
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1answer
100 views

What type of module is this?

It's likely ESP8266-01, but when I look better there a bit more differences at its components. Also I think its pinout is different with a ESP8266-01. When I attach it to PCB I made for ESP8266-01 it ...
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0answers
69 views

Control servo with 4 wires with Blynk

im a beginner in coding and I was wondering if I could control an old servo using the Blynk app. I want to control the direction, so it can unroll the screen up and down. We opened the servo to look ...
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1answer
528 views

How come esp8266 is able to generate 2.4 GHz wifi signals

I am wondering how it is possible to generate 2.4 GHz, if its core clock frequency is much lower than GHz scale.
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2answers
170 views

What is this capacitor for? What is its purpose in this circuit?

Esp8266 programming circuit is here. Could anyone help me identify the purpose of this capacitor? Thanks in advance.
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1answer
2k views

I want to get data from my NodeMCU to my android application [closed]

I have a NodeMCU which is connected to 4 LEDs. If i hit a URL like 192.168.1.2/relay1on then my relay 1 gets switched on and the LED connected to it lightens up. What i want to do is i want to know ...
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1answer
861 views

DHT22 needs electrical reset?

Context : Building a wireless sensor based on ESP8266 + DHT22 (+ "X-8266" board) + DHTtester example progam I fell on a rather strange and annoying problem : Problem : When powering up the board ...
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3answers
657 views

Reset pulse generator for ESP8266

I am trying to generate a reset pulse in order to wake up an ESP8266 device. The ESP8266 supports a "deep sleep" function, in which it consumes very little power. However, the only way to wake it up ...
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0answers
286 views

MAX7219 8-Digital Segment Digital keeps flickering with ESP8266. How Could I remove this?

**MAX7219 8-Digital Segment Digital LED Display Connected To NodeMCU (ESP-8266) The Segment Display keeps flickering. https://www.amazon.com/gp/product/B01D0WSCJA/ref=oh_aui_detailpage_o03_s00?ie=UTF8&...
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1answer
313 views

Controlling Wemos D1 power with P-Channel MOSFET

[ Note: this is the continuation of another question, the first one being my attempt to implement the same idea using an N-channel MOSFET. Based on the answers I received there, I went out, bought a P-...
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0answers
341 views

Controlling Wemos D1 power with N-Channel MOSFET

I am trying to implement something similar to this: https://youtu.be/nbMfb0dIvYc?t=4m27s Basically, the idea is that the microcontroller (a Wemos D1 Mini in my case) is powered up by an external ...
6
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1answer
389 views

Microcontroller wake-up strategies (ESP8266)

At work, we have a remote battery operated magnetic door detector that send a signal to our alarm system whenever we open a door. The battery lifespan is almost a year. I tried to replicate that ...
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2answers
73 views

ESP8266 12F doesn't work when programmed with arduino, but works fine with AT commands

So, I got this webserver running using: http://arduino.esp8266.com/stable/package_esp8266com_index.json V2.4.1 ...
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1answer
54 views

how to use an npn as a switch between battery and motor?

I am a noob playing around with nodemcu and esp8266. I am trying to control a motor in an automated air freshener. I had been trying to power the motor with board supply but I gave that idea up when I ...
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4answers
564 views

Voltage drops when load connected to ld1117a

Package: LD1117A (package sot223) Power: USB adapter( mobile charger ) 5.3 V 2 A When these is not r1 resistor present and adj is connected to ground, Vout is 4.9 V for Vin 5.3 V. r1 is 120 ohm ...
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2answers
695 views

How to design a AC-DC circuit using only the hot/live wire has power input?

I was looking at these new IOT devices coming from CN that are designed to replace your standard wall switch with an ESP8266 smart-switch. It seems there are two types: A) the typical one where the ...
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1answer
515 views

Troublesome circuit with pull up resistors for smart power strip based on ESP8266

I'm making a WiFi power strip with a Wemos D1 mini v3 (ESP8266) microcontroller and a 4 mechanical relay board. 220v mains is converted to 5v 600mA using a HLK-PM01 which powers both the relay board ...
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3answers
791 views

ESP32 microcontroller generates noise on microphone

I am trying to build a device for monitoring ambient noise in a room. I am using SparkFun ESP32 Thing MCU together with SparkFun Sound Detector(electret mic + opamp LMV324m). Nothing fancy, just read ...
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3answers
444 views

Driving relay with ESP8266

I am doing a circuit to drive a 5V 70Ohms relay using ESP8266. The max GPIO source current of ESP8266 is 12mA. I got this information from the forum here https://bbs.espressif.com/viewtopic.php?t=139#...
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2answers
163 views

TPM 3VSB power capabilities

I have a question about Trusted Platform Module header on PC motherboards. I want to install ESP8266 (standalone) inside of my PC, I know of 5VSB the the PSU supplies, but after looking at my mobo ...
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1answer
515 views

4 full bridge load-cells with the HX711

I'm trying to hook up the load cells from a Wii fit balance board to an esp8266 using the HX711 ADC. Ideally, a way using only one HX711 but, a hookup guide for two HX711 with two load cells apiece ...
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0answers
36 views

Troubleshooting communication with ESP-12e

I have an ESP-12e and set it up like here with the exception that I am using FT232RL chip. The problem is I can't receive anything from the module despite the command I send. When I try to connect the ...