Questions tagged [esp8266]
The ESP8266 is a low-cost Wi-Fi chip/module with UART connections and a built-in TCP/IP stack. It has an Xtensa single-core 32-bit L106 MCU, usually running at 80 MHz.
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ESP32-C3 USB not working with Android
I want to connect an ESP32-C3 mini board (pictured below) to an Android phone, so that it can do all the WiFi stuff that Android no longer allows. The board works fine connected to my desktop computer ...
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NodeMCU v0.9 - ESP8266-12 MicroPython Unable to access REPL (Python prompt)
I have a NodeMCU v0.9 which I have successfully flashed MicroPython on. I can't access the REPL using any of the methods listed on micropython docs - (picocom, thonny...)..
I'm able to access the ...
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How to use SCD30 with ESP8266?
I'd like to use a SCD30 sensor connected to ESP8266. I know it's possible to use for example Adafruit library to connect SCD's to Arduino:
...
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Wired network for a lot of ESP8266 / ESP8285
I found this project at GitHub, and I would like to do the same but add a few improvements.
Rotate modules, according to this radiation pattern:
Would it work better?
As I understand ESP8266 doesn’...
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Sim800L can't send SMS
I know it is somehow weird problem, but I don't know what to do.
I am using SIM800L GSM module with ESP8266 nodemsu v3 and they are connected via UART serial communication.
I am using this code to ...
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UART software flow control in ESP32S3 and OTA using cellular modem
I'm using an ESP32S3 chip and trying to implement OTA through a cellular modem. The size of the bin file is 1250KB. The cellular modem has an AT command that downloads all the content in one go. Since ...
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Issues with Nodemcu, LoRa Module (Lora-02), and Bluetooth Module (Hc-05) for SMS Communication
I am currently working on a project that involves using an node mcu, a LoRa module (Lora-02), and a Bluetooth module (HC-05) to enable the transmission of free SMS between two mobile devices when ...
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Odd USB Hub + USB to UART Behavior
I've condensensed several USB connections into 1 leveraging the FE1.1s. I built an eval board that tests this setup prior to implementing into the bigger project (see attached schematic).
The FE1.1s ...
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ESP8266 Sleep & Wake from a single button
Separately putting to sleep & waking the device up is simple.
If I wish to put the device to sleep, do a pull-up to a switch that goes to GND. Attach an interrupt and you're golden.
Waking is the ...
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Using the boot pins as GPIO's if automatic bootloader is selected
I am creating a PCB in which I am using esp32 chip and the chip comes with the serial bootloader so according to the documentation, I can either tie the boot pins to VCC and GND as mentioned or I can ...
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Switching between 3.3 V and 5 V logic and power supply
My project involves interfacing an ESP-8266 with a Serial interface that also supplies power.
The trouble is that the serial interface and its logic levels can be initialized at either 3.3 V or 5 V ...
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Can't get DTMF tones from sim800L gsm module
I am using esp8266 and sim800L gsm module to recieve incoming call and get the DTMF tones from the caller and take an action according to the received number, i am searching for about 3 days and found ...
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Level shifting 2.4V to 3.3V
What design can I follow to make a level shifter? I have used SN75LBC. Its RE/DE has an output of 2-2.4V and I want it to connect to the receive pin of my ESP. The ESP WROOM-02 operates at 3.3V so I ...
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Correspondence between (unkown) programmer pins and ESP8266E leads
I partially opened a smart light bulb, to install tasmota on it. It is supported but to flash the firmware you have to connect to the ESP8266E with a programmer. It shouldn't be a huge deal, but ... I ...
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Not reading the start signal from DHT22 sensor
I'm trying to implement a program from scratch to read from a DHT22 sensor connected to an ESP-01 as a learning exercise. I am basing my implementation on the from adafruit DHT library. Following is ...
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GPIO ISR is not getting called for DHT22 input
I'm trying to read the input from a DHT22 sensor using an ESP-01. Following is my code:
...
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ESP12 with WS2812B first led always stays on
I'm making a custom remote with esp12 and 3x WS2812B led, while making the main code i discovered a problem, the first led in the series always stays on when trying to execute an example NEOPIXEL code ...
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Using a 555 IC to trigger an ESP8266
I have a non-contact AC voltage detector with a 555 IC which I want to trigger an ESP8266 module to send a notification when power is restored after an outage. Since the notification only needs to be ...
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ESP-WROOM-02 SPI flash reserved pins
I’m using some ESP-WROOM-02 modules I had lying around for the first time and I’m a little confused about the included SPI flash IC as part of the module and was hoping someone that has used it could ...
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ESP8266 reboot issue because of voltage
I have a two relays connected to GPIO 4 and GPIO 5 of an ESP12F module running the Tasmota firmware. The ESP12F and the relays use a 1 A Samsung mobile phone charger to get 5 V DC from the same AC ...
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ESP8266 not connecting to Arduino IDE
I've been trying to connect the ESP8266 Wifi module to my Arduino Leonardo and program the wifi module from it (using Arduino IDE). However, I'm not able to get the connection established! I tried ...
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How to disconnect ESP8266 from the access point permanently?
I connected an ESP8266 to an AP using the following set of commands:
AT
AT+CWMODE=1
AT+RST
AT+CWLAP
AT+CWJAP="***","***"
Now the problem is I ...
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How to increase the voltage for a TFT SPI ILI9486 powered via USB?
Hello everyone,
I am new to the IoT field and have an ILI9486 SPI TFT display that can be powered between 3V and 5V. I am using pin A0, as shown in the provided schematic, to power the display using a ...
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High-power LED driver
What would be the best way to drive 3 high-power RGB LEDs with one 18650 battery? The LEDs are 3 W a piece. Forward voltage is 3.2 V, forward current 350 mA per color.
I would like to use a mini RGB ...
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How to remotely control a TT6061A dimmer using an ESP8266 and detect its current state?
I am trying to remotely control a TT6061A (embedded inside an existing module), 3-way dimmer using an ESP8266. My goal is to set the device state to OFF, LOW, MEDIUM, or HIGH.
However, there is no ...
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Why am I getting 255 for all NPK values?
I am using a NodeMCU ESP8266 WiFi board for collecting N - P - K sensor data. I am using RS485 as interface.
This is the code:
...
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ESP32 based door/window sensor using a reed switch (logic issue)
I have an ESP32-based reed sensor used to monitor door and window events. ESP32 is put into deep sleep mode, and the reed switch is connected to a RTC pin in order to wake up the MCU (external event ...
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Connecting a ESP8266 GPIO Input to a 4.2V
I am following this great article on building a low power sensor using ESP8266. The author (Gadjet) connects the GPIO12 pin to a LIPO through a 10K resistor. I am not sure if this a great way to do, ...
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Connect OLED display to dev board
I want to use a small OLED display for a project. I need a color display as small as possible and I found these models that would be good for my application:
MDT0096AIH-SPI
MDT0096AISC-SPI
I will ...
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WS2812b with Wemos D1 Mini: first LED has a constant color, further ones stay dark
I'm trying to connect a WS2812b LED strip to a Wemos D1 Mini. I'm powering the strip from the 5V pin of the D1 (which is powered from USB). The data pin of the first LED is connected through a level ...
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Electrical connection between RP2040 and ESP-12F
I'm projecting a PCB board with a Raspberry RP2040 and the WiFi module Ai-Thinker ESP-12F (it is the only available from my PCB provider) following the official documentation, but I have some doubts ...
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Schematic to connect ESP32 with SSR
I would like to connect the SSR (Fotek-40DA) with ESP32 and use PWM to control the phase angle thereby controlling the power going to the heater. The specs (Fotek-40DA) do mention the input voltage ...
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Wi-Fi (esp8266) Point-to-Point Connection
Is it possible to have a point-to-point connection over Wi-Fi, similar to how an RF Module would work. No connections involved, just sending or receiving data packets to all nearby networks. I am ...
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Nucleo64 Vdd maximum output current
I'm trying to power an ESP-01 (8266 chip) using the 3.3v pin of a nucleo 64 stm32F446re board, but the module won't power up (red LED off). I've searched the web for information on the maximum current ...
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ESP8266 browning out power supply
I want to setup an ESP8266 to monitor and control my hot tub's relay board. Because of where the hot tub is located, I need to modify the ESP8266 to use an external antenna (I could also order a pro). ...
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How to get methane concentrations from MQ-4 sensor
I have an ESP8266 chip that is connected to an MQ-4 sensor. I need to get the concentration of methane in air, the problem is I can't find a way to convert the analog readings into ppm or any other ...
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Very low-power ESP8266-based motion detector
I'm building a new schematic to set up an ESP8266 m-based motion detector which should only work during the night.
My goals are:
Use an RTC to store time and read time when ESP starts up (if not in ...
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105
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ESP8266 not working with Arduino Nano
I am building a WiFi-controlled servo project using an Arduino Nano clone, an ESP8266 (ESP01), a G9133 3.3 V voltage regulator, and a generic 9g micro servo. I just realized, it looks like the ESP01 ...
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Sending int16_t or uint32_t data over serial on STM32F103 microcontroller
I designed a device which includes many sensors. These sensors are constantly sending information, every 400 ms, do there are series of data which reach the microcontroller (STM32F103). I want to ...
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ESP not able to connect flash
I'm trying to build a device that can print something on my I2C LCD display. I wanted to use the ESP-01 module initially but it was not giving the desired output, just printing random digits.
So I ...
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Best way to drive N or P MOSFETs from ESP8266
I have a project that requires me to control several 12 V peripherals (motors/LEDs/solenoids) up to 5 A.
My controller will be either an ESP32/ESP8266, I will have regulated 5 V and also an ...
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BME280 sensor locks ESP8266 and prevents booting
I have an AZDelivery Node MCU ESP8266 linked via SPI to a Adafruit BME280 Temperature, Humidity and Pressure Sensor that when the data connections are made it prevents the ESP from booting and ...
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esp8266 occasional resets when controlled relay is energized
I am having trouble with a circuit that I have designed for an esp8266, that controls 4 relays.
The MCU is flashed with esphome, and occasionally resets itself, after turning on one of the relays.
I ...
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Esp8285 not working
Hi my custom board for esp8285 isn't working, does anyone has idea what went wrong? I'm looking for error in schematic
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esp8266 reading from envir current cost monitor seeing garbage characters on serial port (rpi reads without the unknown characters)
I'm trying to read the output of a current cost Envi-R monitor which outputs well spec'd xml over serial. I have connected the Envi-R TX and GND to my esp8266 (a nodemcu dev board) and the xml can be ...
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Capacitive moisture sensor and need of voltage regulator
I am trying to build a (capacitive) moisture sensor with ESP-01S, my goal is to measure the soil moisture level, send it via wifi to a server (estimating 10-15sec execution time) and finish it off ...
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Measure AC (24VAC) current with 3.3 MCU
I'm trying to use the following circuit designed by someone else :
VCC = 3.3V
It's aparently adapted from this one:
Taken from : https://github.com/OpenSprinkler/OpenSprinkler-Hardware/tree/master/...
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Wake up ESP8266 with wall switch
Using LTSpice and uninformed dabbling I've managed to produce positive spikes from a wall switch that I hope will wake an ESP8266 for use to control hue lights. Once awake the IC will debounce, read ...
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Bits getting scrambled over software serial between ESP8266 and Pololu A-star
Setup:
ESP8266: board description (sorry it's in Japanese)
Pololu A-Star 32U4 Micro: board description
Communication over software serial, library EspSoftwareSerial, baud rate 9600
Sender: pololu, ...
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ESP8266 BJT (bc547b)
i want to make expansion PCB for ESP8266 and i'have read many discussion for Arduino BJT connection, but still need to ensure is it working with esp8266 to switch on 20mA 24DC buzzer.
and also what is ...