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 INPUT-pullup
I have an enable pin that i want to drive high always except when a limit switch is closed, and at the same time I want to monitor the state of the limit switch So is that possible with input_pull-up ...
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Boost Current and Limit Voltage
I have a radar gun which has a serial interface. The gun reports the velocity out to the serial port. I want to attach a microcontroller (ESP8266/ESP32) to the serial interface and forward the ...
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Analogue Read in ESP8266 WEMOS D1 MINI is fluctuating
I am trying to read the current consumption of a light bulb (160 W) using a current transformer (5A/5mA) connected to the ESP8266 WEMOS D1 MINI analog pin.
I have put a 240 ohms burden resistor in ...
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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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MCU not powering off completely
I implemented this on/off circuit that I use with a LiPo battery and a HT7833 voltage regulator. Since my MCU (ESP8266) can only handle 3.3v, I added a voltage divider for the MCU sense pin, just like ...
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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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How can I run iot devices on batteries effectively [closed]
I am trying to make a gift for someone and I want to make a little thing that displays a cute message whenever a number is texted. I know how to connect an esp8266 to an AWS system so that messages ...
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My first schematic of a 2-channel relay board [closed]
Hey all this would be my first try at creating a schematic in KiCad.
The schematic is a basic 2-channel relay.
The inputs are automotive 12v and gnd. This gets converted to 5v by the K78L05-1000R3.
...
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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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Did a PWM fan tach signal fry my ESP8266?
I spliced two PWM fan tach wires and connected them to a single ESP8266 GPIO pin. Since I tried powering this on I couldn't get the ESP8266 back up and running, even after disconnecting the splice ...
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How to power ESP-12 (ESP8266) with LiFePO4 battery?
I've tried several different programs. A simple blinking program results in nothing. It works when connected into the programmer:
The ESP12 has a blue LED. The LED blinks only when connected to the ...
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Driving a 12V ~500mA load with a 3.3V logic level special pin GPIO0 on a ESP07s and ULN2003
As some of you know GPIO0 is a special pin that needs to be pulled HIGH during start-up else the ESP07s enters flash mode.
Questions:
The pull-up to 3.3V works right? My thinking is that if I have ...
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Driving a 12V ~500mA load with a 3.3V logic level special pin GPIO0 on a ESP07s and MOSFET
As some of you know GPIO0 is a special pin that needs to be pulled HIGH during start-up else the ESP07s enters flash mode.
I've tried to read up, but it feels like I know too little to know what to ...
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Drive 24 V LED strip using 3.3 V Wemos D1 mini and MOSFETs
I am searching for the right MOSFET that:
Can control a high power LED strip of either 12 V or 24 V.
Must be a through hole component (because I intend to solder everything by hand).
Should be ...
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How to power an ESP8266 + LED strip correctly?
I would like to power ~100 LEDs from an WS2812 LED strip and an ESP8266 with my power supply of 5V / 5A.
I've read a lot of tutorials and advices but I'm still not 100% sur that all my assomptions are ...
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Controlling garage door using microcontroller and transistor
I am trying to control my garage door using a microcontroller connected to WiFi. (Esp8266, nodemcu).
The model of the garage door is steel-line sd800, I have found a diagram of my garage door and how ...
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Best way to control RGB LEDs with wireless MCU
I am working on a project that involves using 5050 package RGB LEDs (specifically, the ones in this datasheet: link to datasheet). Currently, I have successfully controlled one of these LEDs with an ...
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Making a custom ESP8266 board
I've challenged myself to make a custom ESP8266 (ESP12S) board. I'm having a problem I cannot decipher: The PC sees the USB device, and I can successfully upload my code through the Arduino IDE, but ...
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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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Why is IRFZ44N MOSFET with ESP 8266 always closed?
I am trying to control a 12V solenoid valve with an ESP 3266 microcontroller. I have connected the device to an IRFZ44N MOSFET, a 12V NiMH battery pack and a 12V LED for testing as shown here:
I ...
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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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Problem using mosfet to reset a microcontroller (drain voltage too low)
I'm experimenting with a learning project, where I want to generate a "reset pulse" (from high-low-high) to trigger a reset of a microcontroller, an ESP8266. This is the only way to wake ...
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How check a external tension with an ESP8266 [duplicate]
I have a small project with an ESP8266, on which on a PIO I need to retrieve the presence or absence of an external voltage, from another totally independent circuit. The voltage I need to check is ...
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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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Can I port STM32 code to an ESP32 (espressif) microcontroller?
Is there a reliable way to convert STM32 code to run on an Espressif microcontroller such as an ESP32 / ESP8685 ? Or would this have to be done manually?
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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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PWM and interference/noise
Please help me with finding the source of the noise in my system
I have two bldc motors connected to two individual motor drivers powered through a buck converter.
The hall sensor of the motor driver ...
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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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What is the value of GPIO input along a rising or falling edge?
I'm using the gpio_get_level function documented here, which states that it returns a 0 or 1 depending on the value. What is the value if this function is called ...
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ESP-WROOM-32: Invalid head of packet (0x46)
I'm trying to flash a program to ESP-WROOM-32. When I run make flash, I get the following error. I tried this with 3 different ESP-32s and I get the same error. ...
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Relay for ESP8266 using BC548
I'm working on a diy pcb relay for one of my project which uses ESP8266 as a microcontroller. For switching relay I'm using bc548 npn transistor but yet I'm not sure it'll completely turn on at 3.3v. ...
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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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How to program and use an ESP8266 module as a standalone device?
I want to make an independent sensor which measures temperature and sends it to my NodeMCU. My ESP8266 module has two GPIO pins and that's enough for my temperature sensor.
I don't want to use an ...
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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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Latency during UDP transmission via ESP-01S (ESP8266-01)
I'm working on a project that consists in sending data frames at a frequency of 200Hz, from a Teensy 4.1 to another, through two ESP-01S (See diagram and code below).
Hardware :
The system is composed ...
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As in the picture when I connect the gnd of hlw8012 to the gnd of esp8266 I get electric shock .what should I do now
I'm working on a project based on Iot so I was using hlw8012 for power monitoring and after connecting the IC module to the esp8266 whenever I touch the Esp module I get electric shock . What should I ...
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Load bootloader on ESP32
I'm trying to load the bootloader to my esp32 or that's what I think I need, because when I connect it with USB to TTL, and I connect TX with RX, Rx with TX and GND with GND and I reset the micro by ...
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Need a way to decrease the current used by a stepper motor through a TMC2209 when it is idle
I am using an ESP8266 to control a stepper motor through TMC2209. In my use-case, the motor is idle 80% of the time. But i can't turn off the enable pin since i need the motor to still be fixed in its ...
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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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ESP-01 takes a long time and multiple resets to connect to Wi-Fi
I have a ESP-01 chip I'm trying to program using the Expressif C SDK. I'm using the ESP chip with a breakout board with a decoupling capacitor. I'm supplying power to it using the 3.3V pin on an ...
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Can I connect multiple USB 2.0 females to a MEAN WELL 5V 10A power supply?
I have a 5V 10A power supply and some USB 2.0 female breakout boards.
I only need the power and no data.
I have six ESP8266 for small Wled lights which uses a maximum of 1.3 amperes per unit.
I have ...
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Why do I need to ground GP0 to enter programming mode in ESP8266?
I have an ESP-01 chip. I found out that I need to ground the GP0 pin to enter the programming mode to flash a program to the chip. I can't find anything in the ESP8266 datasheet that documents this. I'...
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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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