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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. It has an Xtensa single-core 32-bit L106 MCU, usually running at 80 MHz.

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PWM driver for ESP01 using IRFZ44N

Description I am making a basic led dimmer for a hobby project. I am using ESP01 because its compact and only 1 GPIO is required for this project. I have a extra IRFZ44N's around so didn't wanna but ...
Mr. Stark's user avatar
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0 answers
55 views

ESP-8266 doesn't boot on particular power supply

I have an ESP-01 board (small board with ESP-8266) that usually works fine, but with one particular power supply, the LED just flashes rapidly and the module doesn't start. I know that these modules ...
Lukor's user avatar
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ESP8266 vs ESP32: Which is better for my project? [closed]

I am an IoT development enthusiast, and I recently encountered a dilemma when working on a new project. I am considering using Espressif's WiFi module, but I am hesitant between ESP8266 and ESP32. I ...
FredMorgan's user avatar
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16 views

Connection of FS1000A with CC1101 on the ESP8266 board

I have a problem receiving data from the transmitter. Packets are sent and the receiver registers them. But the data is empty. The transmitter and receiver are connected to ESP8266 + NodeMCU V3. Two ...
Jakub Gloc's user avatar
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0 answers
38 views

ESP8266 NodeMCU SD Card Not Initializing

I have tried numerous tutorials, Arduino examples and I cant get an SD to initialize. There is a card inserted that is formatted with exFAT and there is one file test.txt. Particularly https://www....
Jason Crosby's user avatar
3 votes
5 answers
677 views

MOSFET driver: Totem Pole or NPN Self-Biasing Turn-Off Circuit

I am building a project, where I want to drive some MOSFETs to control for example a 50W 12V LED and it brightness with a PWM signal from an ESP8266 with a frequency in the range of 1-5 kHz. I found ...
DeltaLima's user avatar
-1 votes
1 answer
87 views

Use of crystal oscillator ‎ ‎

Can I use this crystal oscillator instead of the crystal in this picture? ESP8266 Hardware Design Guidelines If so, can you explain to me how, I have to connect the crystal?
Frederik's user avatar
0 votes
1 answer
57 views

Problem to transmit data using FS1000A

My circuit have 4 simple parts. Input voltage is 14.5 so I use two regulator 7805 and 7809 to power supply boards. I use 7805 for WeMos D1 mini (clone) and 7809 to supply power of FS1000A (max input ...
math deaman's user avatar
-1 votes
1 answer
57 views

Why do my motors run slowly and then stop when powered by two 9V batteries in parallel through an L298n motor driver with a NodeMCU ESP8266? [closed]

I am currently working on a project that involves controlling four dual-shaft DC geared motors (the yellow ones.) I am controlling them with an L298N motor driver through a NodeMCU ESP-8266. I have ...
arun's user avatar
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0 answers
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Is this MOSFET compatible with this coreless motor?

As a warning, I will state at the beginning that this project is a hand-me-down and I do not have the complete specifications of components. This is a part of the problem. I am working on building a ...
Alpha Delta's user avatar
1 vote
1 answer
58 views

ECG Monitoring with AD8232 ECG & ESP8266 in Ubidots

I want to try this project: https://how2electronics.com/iot-ecg-monitoring-ad8232-ecg-sensor-esp8266/ so I implemented the code in Arduino: ...
Claire Buckley's user avatar
0 votes
1 answer
44 views

Heart Rate Monitor, replacing pulse sensor with ECG?

I'm completely new in this area, but I would like to try this project: https://iotdesignpro.com/projects/iot-heart-rate-monitor-project-using-arduino-and-esp8266 The only mismatch is that I have an ...
Claire Buckley's user avatar
1 vote
1 answer
102 views

Monitoring an LED state from another circuit via an optocoupler in ESPHome

I am attempting to control a KVM switch using ESPHome on a D1 Mini ESP8266 board, so learning some electronics along the way. The KVM has the main unit and a controller on the end of a 4 core cable. ...
Ben Swinburne's user avatar
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0 answers
37 views

ESP8266 NodeMCU ESP relay control problem

I'm running into a problem trying to control a relay with ESP8266. The relay works I can manually apply power and hear it click when it turns on/off. I'm taking one of the digital outputs to control ...
Jason Crosby's user avatar
0 votes
3 answers
156 views

Asking for help, ESP8266 and AMS1117 get fried

I have a problem with the project I am currently working on: https://git.la10cy.net/DeltaLima/CanGrow/ I designed and ordererd a PCB for it and tried the schematics on a perfboard beforehand. But ...
DeltaLima's user avatar
0 votes
0 answers
49 views

PCF8575 weird behaviour

So I designed a PCB in which I used PCF8575 i/o expander in combination with 74HC14 logic inverter and ULN2003A transistors, and my idea was the following: Pull the PCF8575's outputs high and send low ...
k0cka's user avatar
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2 answers
97 views

ESP8266 powering through Li-Ion battery 18650

I have a generic ESP 8266 wifi module board. The voltage ratings suggest 5 volts at the power micro-usb port which is internally dropped to 3.3 volts. Now there are direct 3.3 v header rails. Now can ...
Saikat Banerjee's user avatar
0 votes
0 answers
35 views

ESP8266 with 1C5V Relay - always ON

Please find the circuit: I am using NodeMCU ESP8266 and 1C 5V Relay. ESP8266 board is connected to the USB port of laptop and it is powering the board. The problem is, whenever I upload the code to ...
Akhilesh B Chandran's user avatar
0 votes
1 answer
39 views

ESP12 to switch computer power

Hi all! I'am trying to use an ESP12S to turn a desktop computer on/off remotely, using a NPN 2N2222 transistor, while also trying to keep the physical power button working. Much like this project: ...
SnackK's user avatar
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1 answer
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Relay PCB board review

I just finished two versions of PCB layout for a relay board and I wanted to ask for some feedback before I order them - so it doesn't end up like my first PCB, which didn't work because I rushed it. ...
k0cka's user avatar
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1 vote
0 answers
106 views

PCB layout review and controlling ULN2003A

I just finished my PCB layout for a relay board, and I would like to ask for some feedback. I'm a beginner in this so any tips will be appreciated. I also wanted to ask if the 74HC14 is a good pick ...
k0cka's user avatar
  • 51
0 votes
1 answer
80 views

ESP8266 breakout board use in KiCad

I need to design a board with ESP8266 mounted onto a breakout board. Here is the ESP8266 module: https://www.waveshare.com/esp-12f.htm It is mounted onto this breakout board: So what I need to design ...
Daniel's user avatar
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esp8266 (ESP-07S) draws 100 micro amps in deep sleep instead of 20 as documented

I have a quite simple circuit using ESP-07S module (esp8266 chip, no USB, no LEDs). The device, after performing some operations enters deep sleep and waits for a button connected to RST to wake up (...
PanJanek's user avatar
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0 votes
4 answers
161 views

Controlling relay through an optocoupler

I'm trying to control a relay through a TCMT4100 optocoupler but I can't get it to work. I tried to check the TCMT4100's datasheet, but I don't quite understand which forward current should I look for,...
k0cka's user avatar
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0 votes
0 answers
78 views

ESP32 crashes when starting a 3 phase induction motor through a star delta starter

Circuit Details: An esp32 driving 2 relays(5V SPDT HL JQC-3FC(T73)DC5V) via a darlington array(ULN2803A). The relays are connected to the start, stop buttons on a star-delta motor starter. The motor ...
Saran Rathinavelu's user avatar
0 votes
1 answer
98 views

SN74HC165 shift register not communicating properly with a Wemos D1 Mini

I have a simple circuit with two daisy chained SN74HC165 shift register to collect the input of 9 (for now, for thesting purposes, there are only 2) TRCT5000 infrared sensors. Problems: I'm ...
user3161330's user avatar
0 votes
0 answers
273 views

ESP32-D0WDQ6-V3 showing "MD5 of file does not match data in flash!" message

I've designed a custom board which uses the ESP32-D0WDQ6-V3 chip, as shown in the schematic below: Note: the pins GPIO0 and CHIP_PU are being driven by a STM32. The STM32 reads the pins of a nodemcu ...
Emanuel M's user avatar
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1 answer
54 views

Accessing GPIO pins of ESP8266-01

I have a couple 8Pin ESP-01 Modules with an ESP8266. I am planning to use them to read a DHT22 sensor with them and sent the information further via MQTT. On the developer board this works perfectly ...
kEks's user avatar
  • 111
4 votes
5 answers
219 views

BME280 temperature sensor gives wrong readings when RGB leds are on/off

I'm working on an ESPhome project of a night light lamp for my young kids, which automatically glows in different colors to let them know when they're supposed to be already sleeping at night \ ...
OpherV's user avatar
  • 141
0 votes
1 answer
116 views

TCRT5000 combined with ESP8266 ADC voltage divider

I have a circuit with a TCRT5000 that lets me detect proximity since the reflected IR rays will make the photo sensitive transistor conductive and will pull down the voltage below the 10kΩ resistor, ...
Besi's user avatar
  • 737
1 vote
0 answers
84 views

MOSFET high-side 12 VDC switch lets the "magic smoke" out of my D1 Mini

Edit: I don't know if it's better to post an answer myself or add this comment here, but thanks to the comments from @Ale..chenski and @KevinWhite I realised that the problem was not with the MOSFETs ...
Dan's user avatar
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0 votes
1 answer
168 views

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 ...
JavaLatte's user avatar
  • 245
0 votes
2 answers
54 views

Acoustic Noise on SMPS

I'm developing an RGB LED driver and noticed some acoustic noise from the power supply. The power supply is a cheap brandless 12V 20A, output voltage ripple is under 800mV @4A @50% duty. I have no ...
danielHPCX's user avatar
2 votes
1 answer
74 views

Pulling 5V logic low using 3.3V microcontroller

I have a shop-bought, small, portable dehumidifier that is controlled by a 5V logic chip internally. I'd like to be able to control it remotely using an ESP8266 or ESP32 (i.e. 3.3V logic). I only need ...
Thinqer77's user avatar
1 vote
1 answer
931 views

ESP32-S3 SPI pins?

I am a beginner in electronics and tried to use ESP32-S3 for interfacing RFID and unable to find SPI pins in the the data-sheets. Tried Googling for pin reference but after reading so many blogs and ...
Sukhdarshan Vinayak's user avatar
0 votes
0 answers
37 views

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 ...
Sadiq Salau's user avatar
1 vote
0 answers
144 views

Power issues with Nodemcu and Sim800L

I am building a project and i am facing weird anomalies while implementing it. Keep in mind in a student a fairly new to this. So the problem is that i have a usb- charging module connected with a ...
Solo's user avatar
  • 45
0 votes
1 answer
134 views

NODE MCU/ESP8266 interrupts issue

I am using esp8266 to calculate the rpm using hall 3144 sensor, and while doing so there is an issue arises in code. ...
Ryu's user avatar
  • 1
0 votes
1 answer
214 views

Voltage regulation for NodeMcu

I am trying to develop a custom PCB with the esp12-E module. For development and testing, I am using the nodemcu development board ESP8266 V3. I am powering the nodemcu via a 3.7V battery with a ...
Solo's user avatar
  • 45
0 votes
1 answer
61 views

Step-down circuitry

I have a water-filter board that receives 36V input, and needs to power an ESP-WROOM-02D in 3.3V. The power circuit that converts from the 36V to 3.3V is no longer working, and I am trying to ...
Mathieu Legrand's user avatar
2 votes
3 answers
65 views

Cutoff Voltage of Battery and Minimum input voltage needed by Voltage Regulator

I am working on a project for school and I'm having trouble identifying some variables. I am fairly new to electronics and need some guidance. I am trying to power a nodemcu via a Li-po battery rated ...
Solo's user avatar
  • 45
2 votes
1 answer
158 views

ESP8266 + MOSFETs + LED strips

I'm trying to drive with PWM the usual 12V LED strip with a WeMos D1 Mini and a bunch of MOSFETs. Here's the circuit: What do you think of it regarding MOSFET choice and resistor placement? Edit (...
Diego Ferri's user avatar
1 vote
3 answers
163 views

Modification on latching power circuit

I have built the following circuit to power my esp8266. And it works fine. https://community.home-assistant.io/t/multiple-button-wifi-remote-no-deep-sleep-required-battery-lasts-forever/306233 When ...
Kerem's user avatar
  • 11
0 votes
2 answers
123 views

ESP8266: Able to flash but no program execution

I designed a PCB based on the ESP8266EX dotn here is the schematic: To flash the board I use the module: https://joy-it.net/de/products/SBC-ESP8266-PROG I am able to flash the board with Arduino IDE ...
Juno's user avatar
  • 93
0 votes
1 answer
77 views

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 ...
hjeij2000's user avatar
1 vote
1 answer
63 views

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 ...
namarino41's user avatar
0 votes
2 answers
235 views

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 ...
P-Em's user avatar
  • 13
0 votes
0 answers
189 views

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: ...
Kaomer's user avatar
  • 1
0 votes
0 answers
43 views

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’...
Sergey Tytarenko's user avatar
0 votes
0 answers
263 views

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 ...
Mohamed Essam's user avatar

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