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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11 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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48 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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211 views

esp32 3.3v relay

I am developing my first PCB and I would like to know how best to power a 3.3v relay with control from ESP32 module. Because I am powering the relay with 3.3v do i even need the optoisolator in my ...
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92 views

Modify Transformerless Power Supplies

Based on this article: https://hackaday.com/2017/04/04/the-shocking-truth-about-transformerless-power-supplies/ I have some rf wireless plug outless which use transformerless power supply. I would ...
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45 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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64 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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4k views

ESP32: how to keep a pin high during deep sleep (RTC GPIO pull-ups are too weak)?

I'm using an ESP32 in a battery-powered device. The ESP spends most of the time in deep-sleep to save power. The device also has some 5V-powered sensors which I'm feeding from a MCP1640 step-up ...
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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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7k views

ESP8266 SPI pinout

I'm new to the whole development board thing and I've just started experimenting with an ESP8266-12E module. Unfortunately I am unable to get the SPI display working. It works on an Arduino UNO, so I ...
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1answer
76 views

Circuit to turn microcontroller on when reed switch state changes (to monitor door lock state)

I'd like to build a circuit that provides power to a microcontroller (ESP8266 in this instance) when a reed switch is changed from closed to open AND when changed from open to closed. This is to be ...
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1k views

Explain why the NodeMCU auto-program circuit would be useful

I'm looking at the NodeMCU "auto-program" circuit but could not understand why it is there at all. From my point of view, this circuit enables open-collector outputs, but makes programming dependent ...
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54 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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93 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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49 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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162 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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159 views

Is it possible to use ESP32, BLE4 or BT 2 and WiFi same time?

I am planning to use ESP32 module to transfer data using wifi (ESP32 web server AP)to remote PC and also the same time I need BLE to communicate with a mobile app and get some data to eps32. so I ...
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660 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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4k views

Replace AMS1117 5V-3.3V LDO on NodeMCU for LiPo with low quiescent current

I want use my NodeMCU to drive a SIM808 Module with integrated LiPo Charger. https://www.itead.cc/wiki/SIM808_GSM/GPRS/GPS_Module There are two problems. First of all the SIM808 Module just provides ...
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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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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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3k 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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1answer
48 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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67 views

WRL-1368 (ESP8266) wifi module briefly flashes blue LED once when powered up, then nothing happens

I bought a WRL-13678 wifi module, but when I connect it to a 3.3V power source, the blue LED flashes once, then nothing happens. I tried powering it from a 3.3V breadboard power supply (connected to ...
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35 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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37 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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1answer
38 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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1answer
26 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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1answer
70 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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2k 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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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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193 views

What happens when a LIPO drops under 3V? WeMos in DeepSleep doesn't start up again?

I have a Lipo (18650) which is charged by a solar panel (6V/6W + TP4056 charger). It's feeding a WeMos D1 Mini which is put in DeepSleep every 10 seconds. When it's awake, it sends something to ...
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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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1answer
308 views

MCP2210 - Plug n' Play HID Keyboard

I'm working on something at the moment that uses an ESP32. I would like to have simple strings that I can specify within the ESP32 code to automatically "type" on the screen. For example, if I did ...
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1answer
44 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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1answer
173 views

Nokia C100/1616 SPI TFT with ESP8266

I am making a wifi scanner with ESP8266 and to display information I am using SPI based Nokia 1616/C100 display. This time I am coding ESP8266 natively rather than using mcu + esp8266 (running at ...
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169 views

Measuring 0-240v 50-60hz Mains AC with Arduino/MCU

What is the proper way to measure 0-240v 50-60hz Mains AC with an arduino / 3.3v mcu? (Edited to include a diagram of a proof on concept, which is transformerless) Can anyone confirm that this is ...
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27 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 ...
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1answer
66 views

Logic level converter for NodeMCU (ESP8266): Input 24V/16V (Hi/Lo), 500 Baud

I want to use a digital input pin of a NodeMCU board (ESP8266) to read a digital signal. The signal line idles at 24V DC. The logic levels are 24V and 16V. The signal speed is 500 Baud (each signal ...
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151 views

SK6812 - LED Flickering

I am facing a strange issue while building a simple LED matrix. I am using the SK6812 LEDs and an ESP8266 controller. The LEDS will be controlled over Wifi. My matrix contains about 180 LEDs on a PCB ...
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How to select a MOSFET when using 3.3v / 5v Logic level [duplicate]

I want to control/dim a 12V LED strip. When using an Arduino, I used a MOSFET IRLZ44N, and a 12V DC adapter - it works as needed. I wish to use same hardware to control it remotely; a Wemos Mini is ...
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578 views

Is it better to use a MOSFET with a gate driver IC or a MOSFET with a lower VGS,on?

I am building an RGBW controller for my room. I will be using an ESP32 with four MOSFETs for each channel. I want to know which is best for fast switching. Do I need to use a MOSFET driver IC such as ...
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228 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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STM32 starts timing out receiving data UART after reading 1 byte

I am having trouble using the UART on the STM32F103 where it stops receiving data, while not setting any of the error flags. The UART device is an ESP8266 at 115,200 baud. I am sending it ...
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3answers
4k views

Control Simple RGB LED Light Strip With ESP-01 Using Homebridge

What I am trying to do is control a simple 2m 5050 RGB Led Light Strip though a ESP-01 that receives http requests through Homebridge. I am doing this through the better-http-rgb Homebridge plugin and ...
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1answer
41 views

NodeMCU GPIO pin interrupt [closed]

When using NodeMCU, I want to toggle the state of GPIO pin, using a physical switch. When the switch is pressed, the switch state should toggle from low to high, or high to low. I know I need to use ...
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0answers
39 views

ESP8266 vs ESP32 and WakeUp vs Reset

Maybe it's my fault but I kinda dislike the design of the ESP8266 when it comes to wakeup from deep sleep via an interrupt. AFAIK (without an external circuit) the ESP8266 can not distinct between a ...
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2answers
96 views

ESP32 FCC Certification

I want to build an esp32 device using the esp32-pico-d4 chip that I will sell to hobbyists. However, I recently came across something called the FCC. It requires radio devices to get certified which ...
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23 views

How to connect five flex sensors to on esp8266?

I’m using a lolin nodemcu 8266. I was wondering if it is possible to connect 5 flex sensors to one node (to make a glove which detects finger gestures). I’m an experienced programmer but new to ...
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1answer
671 views

Piezo Buzzer as analog sensor for ESP8266 Huzzah Breakout

I'm using Adafruit's Huzzah ESP8266 breakout board (overview & pinouts), and I'd like to take input from a Radioshack piezo on the analog input pin without frying it. (Piezo datasheet, for ...
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68 views

WiFi Module inside a metal body

I am using ESP8266 (2.4GHz wifi) in my product which has metallic enclosure on outside but only plastic on the other side. I will be placing this device outside home near gate. Will it be problematic ...