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The ESP8266 is a low-cost Wi-Fi chip/module with UART connections and a built-in TCP/IP stack.

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0answers
23 views

No response from ESP8266-01 during communication with STM32F429 discovery

I am currently working on project that requires usage of UART to communicate between STM32F429 Discovery Kit and ESP 8266-01. I am programming in Keil uVison 5 and CubeMx using standard HAL-library ...
2
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0answers
55 views

Do I need to get a device certified by the FCC if it uses the ESP32/8266?

I plan on making a device that the user can control with their phone via a WiFi connection to an ESP8266 or ESP32. If I end up selling this device, will I need to get it certified? The ESP32/8266 has ...
0
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0answers
44 views

How to tell if Sparkfun ESP8266 has be short-circuited [on hold]

I think I may have short-circuited my Sparkfun ESP8266 board. Is there a way that I can detect whether the board is still usable and if so is there any damage? The only thing that has visibly ...
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votes
1answer
44 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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0answers
28 views

ESP8266 AT command

I've got an ESP8266-12 and I want to use it with the AT commands. Whereas, when I send an "AT", I haven't any reply from the ESP. The upload of the sketch works properly. I can communicate using RX ...
0
votes
1answer
43 views

H-bridge driver circuit where voltage is higher than control ic

I am using an H-bridge to give a clock time signals. The H-bridge is controlled from an ESP8266 (Wemos D1 mini board) The clock requires an 18V signal (alternating every minute for a fraction of a ...
-2
votes
1answer
52 views

Can I tie ESP8266 boot mode pins directly to supply rails? (Warning: maybe not)

Say I want to save a few resistors in my design. Would this work as a barebones circuit?
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2answers
44 views

Use regulator when input voltage is above threshold other wise use direct input voltage

I don't have much practical knowledge of electronics. I am trying to operate esp12e with single Li-ion battery with charging circuit. I am planning to use a good LDO regulator because Li-ion battery ...
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0answers
52 views

Zero-crossing signal inconsistent timing

I have an ESP-07 with NodeMCU firmware connected to a dimming module with a zero-crossing pin. The current frequency should be 50Hz, which means that the time between two zero crossing should be 10ms,...
0
votes
2answers
45 views

logic level converter does not get to 5v

I'm trying to control a 2 relay module with an Esp8266 esp 12-f. After a while, I realized that the GPIO from the ESP8266 was not going to drive the 5v needed for the relay to be activated. I only ...
0
votes
1answer
76 views

ESP8266 (esp-07) powered by battary(s) for at least 1 year

Hey all I am trying to see how long I can possibly have a ESP8266 ESP-07 operate with only 1 or 2 of the Lithium Ion Battery 18650 Cell which claims to have 2600mAh. I am making a window alarm sensor ...
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votes
1answer
36 views

Can this ESP wifi board's firmware be rewritten?

I'm new to all this node mcu thing. I'm searching for relay shields because they're ready and well soldered, so I can put them into my light switches with no effort. I've found this pack which ...
0
votes
2answers
52 views

ESP 12E resets on connecting to a client in WiFi mode

The image above is my schematic for ESP12E. I soldered the circuit as shown. When ESP is in WiFi mode (like an AP), and I try to connect to that from any device (laptop, mobile) there is a very high ...
0
votes
1answer
51 views

ESP32 max output voltage on GPIO

I cannot find what is the ouput voltage the ESP32 ? I mean OUTPUT on the GPIO. I'm a beginner with this technology and I don't find this information. Thank you for your help !
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votes
0answers
31 views

ESP8266 - 01 has connected to the relay modules, its getting junk characters continuously in the terminal

When ESP8266 - 01 has connected to the relay modules, its getting junk characters continuously in the terminal. Tried with two same boards and different types of serial converters, but with similar ...
0
votes
1answer
23 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 ...
0
votes
0answers
42 views

ESP8266 Input pin toggles automatically

I have an ESP8266 simple switch circuit, which should toggle a relay based on input received from a switch. However the output seems to toggle automatically every few minutes, without any input. I've ...
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0answers
17 views

Switching HCSR04 with a PNP transistor and ESP8266

I want HCSR04 sensor to work for once in 10 minutes. So I thought I could use a transistor and reduce power consumption. But I could not use a NPN transistor because HCSR04 works even if the ground ...
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0answers
52 views

how to switch off ultrasonic sensor when not in use?

I have ultrasonic sensor which is connected directly to the battery, the sensor take data every 10 mins and the battery is not in use for the rest of 9 mins. I want to switch off the power supply to ...
0
votes
2answers
199 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 ...
0
votes
2answers
67 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 ...
-1
votes
3answers
56 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 ...
1
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0answers
35 views

ESP8266 shutting down while powering a mosfet only when said mosfet has a high current load

I am working on a small quadcopter based around the ESP8266-12F. I used a trace width calculator for all PCB traces as well as a 100uf tantalum capacitor shared by all motors to ensure low voltage ...
1
vote
1answer
51 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 ...
2
votes
3answers
465 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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0answers
61 views

ESP8266 and ultrasonic sensor HC-SR04

don't laught to much if my qestions are too lame but I'm just begginer in electronic stuff :-) So I'm trying to run an ultrasonic sensor HC-SR04 with D1 Mini. I had read this (https://www....
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0answers
73 views

Unable to post data in JSON format to ThingSpeak using ESP8266 thing dev board

I am trying to store data in json format and bulk update my ThingSpeak channel. The code below is just for test purpose to make sure JSON format works properly. However, after several tests I am ...
0
votes
1answer
54 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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votes
0answers
27 views

ESP8266 and ESP8285, the GPIO pins for internal flash become available now?

The ESP8285 is somehow identical to ESP8266 chip but manufacturer added some 1MB flash inside, tied to SPI0 port. What I don't understand is that now those pins can be used as GPIOs together with ...
9
votes
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 ...
0
votes
1answer
105 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 ...
4
votes
4answers
137 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 ...
0
votes
1answer
67 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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votes
1answer
51 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 ...
0
votes
2answers
100 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 ...
-1
votes
1answer
37 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 ...
0
votes
1answer
34 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 ...
1
vote
3answers
61 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 ...
0
votes
0answers
47 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 ...
1
vote
2answers
113 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 ...
0
votes
1answer
58 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 ...
0
votes
0answers
30 views

Unable to retain previous value in internal RTC memory of ESP8266 thing dev after its wake up from deep sleep

I am trying to use the following code. But in this case, sleepMemory.wakeCount always remain 'one' each time my counter wakes from deep sleep. I tried to print out the values in serial monitor and ...
-1
votes
1answer
72 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 (...
-1
votes
1answer
58 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 ...
5
votes
4answers
2k 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 ...
0
votes
0answers
23 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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votes
0answers
70 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: ...
0
votes
1answer
62 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 ...
0
votes
0answers
31 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 ...
0
votes
0answers
15 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 ...