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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.

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4answers
5k views

converting 3.3v to 1.2v

I have a electrical problem that I hope to get some help with. Let me first start of by saying that I'm quite a noob in this field (I'm a IT guy), but I hope to learn something. The problem I have is ...
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1answer
473 views

Can't reflash esp8266 - 12E after many attemptions

I have the following circuit for updating custom firmware to my esp8266-12e module. I've tried many variations for GPIO0, GPIO2, but none of them works. I use the Arduino IDE to make hex files, and ...
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1answer
2k views

NPN transistor is always on

I'm completely new in hobby electronics, and I assembled the following circuit to control a power LED over wifi using esp8266. The problem is, that it is always, on no matter, what I send via GPIO1 ...
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4answers
4k views

How can I turn off a 3.3V circuit with a 3.3V microcontroller

I'm working with ATTiny85 that has low current (40 mA) GPIO. In the other side I have a power supply (battery with ~5V) connected to a LM317 and an ESP8266 that demands high current (more than the ...
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2answers
768 views

Need to switch GPIO2 from high (3.3v) to low (GND) when I get 12 VDC on other circut

I am trying to build a project (almost done !!!) I just need to be able to gnd GPI02 when I get 12VDC on other circut. I don't know if I need a opticoupler or what I need. I'm NOT trying to close the ...
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1answer
947 views

Sending data over network via MicroController (Sparkfun Thing // ESP8266)

I'm getting frustrated and keep hitting a wall. My basic setup is I have an Apache server running on my Raspberry Pi and I am looking to send sensor data over the wireless network both are connected ...
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1answer
4k views

ESP8266 and Arduino - SoftwareSerial vs Serial problem

I'm using Arduino Nano and ESP8266. When I setup like the picture and connect Arduino Nano to PC by USB: The ESP8266 properly works. (Arduino Nano is just used as a bridge) I print and read from ...
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1answer
398 views

Connecting Sharp GP2Y1010AU0 (5V) to ESP8266 (3.3V) - pin nr 3 - do I need transistor?

I'm connecting Sharp GP2Y1010AU0 to WiFi module ESP8266. Sharp GP2Y1010AU0 is powered by 5V and ESP8266 by 3.3V. I wonder if I need a transistor between Sharp's pin nr 3 and ESP8266? If yes, can it ...
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3answers
16k views

Is it safe to use ESP8266 with 3.7V?

I am using an ESP8266 WiFi module in a circuit. The battery is 3.7V. Is it safe to give the ESP8266 (3.3V) directly without a voltage regulator?
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1answer
333 views

May I connect two voltage sources together if they are aprox. the same voltage? (CP2102)

I am making a circuit in which I have two voltage sources of 3.3V: - First is AMS1117-3.3V voltage regulator. According to datasheet, its output voltage is typical 3.3V, but could be as low as 3.2V ...
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2answers
178 views

OLED is garbled when powered by 3.7 battery but not when powered by USB or variable regulated power source?

I have an esp8266 on a breakout board for programming hooked up to an OLED via GPIO 0 and 2. It works fine if I power it via the FTDI/USB. It also works when I power it at 2.8-3.0V using a desktop ...
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2answers
390 views

Simplest way to convert 78 VDC to 3.3 VDC?

I'm doing a ESP8266 implant on a LED light driver, which converts 220 VAC to 78 VDC. I need to power the ESP8266 with 3.3 VDC. What is the smaller, cheaper, easier and efficient way (if any) to do ...
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0answers
563 views

Esp8266 and uln2003 restarts

I am trying to drive 6 LEDs from an Esp8266 (esp201 break out board). Because of the Limit current of 12 mA the esp can do i want to use a 7way darlington Array to Power the LEDs. I have programmed ...
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1answer
944 views

Will this antenna even help?

I am using ESP8266 (esp-07) in a project. I was facing connectivity/range issues with my old router. So, I am planning to use a PCB antenna with esp. This is how it looks: Here is the mechanical ...
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2answers
252 views

Battery lifetime about a fifth what it should be

I have an esp8266-201 hooked up to an LM3671 buck converter breakout that is in turn connected to a 3x AAA battery pack. The capacity of the battery pack should be at least 1200 mAh at 4.5 volts. ...
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2answers
2k views

Detect if input voltage is 110V or 230V signal

I'm building a small electronic project that will measure the power consumption of a device and send this back to Arduino or ESP2866. I've figured out how to measure the current that goes trough a ...
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2answers
2k views

Stabilize pins on Esp8266 boot

I have been making a project involving a relay and an esp8266. Essentially a WiFi enabled relay. The issue that I have been having is that when the esp8266 boots it flashes all of its GPIO pins high ...
0
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1answer
915 views

Why is my IR sensor giving wrong high voltage output?

I've picked up some IR sensors from a local electronics shop. The shopkeeper had no idea about the specification/part-no of the sensor. I've assumed it to be TSOP38238 as my sensor looks exactly like ...
5
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1answer
4k views

Measure ESP8266 battery

I am building a circuit using the ESP8266-01 and a temperature sensor. For the final test I am using a 9V battery and I have many questions: The 01 version only have two pins to read, but the GPIO0 ...
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1answer
654 views

Battery and Voltage Regulator for ESP8266 and HC-SR04

I'm working on a project that includes an ESP8266 (requires 3.3v input (250 mA peak)) and a HC-SR04 (requires 5v 20 mA peak). I'm making it battery/solar powered. I'm trying to keep costs down as ...
3
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1answer
2k views

Indoor direction using wifi ESP8266 RSSI

Am trying to build a small device that is able to determine the direction of object indoor. Not the location, only direction. I bought ESP8266E wifi chip and arduino ESP8266E: The ESP8266 is the ...
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1answer
114 views

Switching problem with a LED

I have a basic circuit, with just an LED and a switch between the ground and the RST pin. When I press the button, the LED glows lightly but RST is not triggered. Of course if I remove the LED, the ...
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2answers
834 views

How to know if the ESP8266 has been manually reset?

I try to entirely rephrase my problem. On the ESP8266, the RST pin is always HIGH (+3.3V), and you need to put it dow to 0-1V to reset the chip. I will plug two push buttons on the reset pin, "...
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4answers
22k views

Problem powering ESP8266 with two 1.5V AA cells

I was testing the deep sleep mode featured in the ESP8266. I have a simple USB battery power supply associated with a 3.3V power regulator (https://www.adafruit.com/product/2165). Everything is fine,...
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2answers
735 views

ADT7410 I2C temp sensor works only after a power cycle (ESP8266)

I have an ADT7410 temperature sensor connected to an ESP8266 running nodemcu. The issue I am having is that I can only get good changing data after power cycling the ADT7410. Until that I get either ...
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1answer
4k views

Can a nRF24L01+ chip work alone? (i.e. without Arduino borad)

I have a prototype based on the ESP8266 wifi tranceiver as a standalone module, without any Arduino borad. It works fine, but I have heard that the nRF24L01+ chip is less power consuming. After ...
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2answers
7k views

How to connect 16x2 lcd to esp8266?

I have ESP8266-01 this model I Updated the frimware to nodeMCU and uploaded the web server code and tested by blinking led via web browser. Now I want to test that if I can send text data from web ...
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1answer
95 views

Logic level issue

I'm new to electronics so please be patient with my ignorance. I'm currently dealing with a problem where my primary device deals with 3V logic (Esp8266). The output from my second device when on ...
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2answers
510 views

what wattage 10 ohm resistor needed for 330mA at 3.3v?

I'm pretty new to all this. Please forgive me if this is an obvious question. I am working with an ESP8266 module. They generally have a max operating current draw of somewhere around 250 mA. I ...
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1answer
212 views

Common ground between two power supply [closed]

I've tried to use a motor driver module(hg7881) with the esp8266. The esp8266 was connected to a 3.3v breadboard power supply and the DC motor with a different one, a 9.6v NiMh battery pack. I've ...
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3answers
3k views

3.3v from 5v Arduino digital pin

I have an ESP8266 that I've got connected to my arduino and communicating quite well with... Now I'm looking at options to run my conifig via battery, so need to find ways to shutdown the ESP8266. ...
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4answers
6k views

esp8266 throwing random symbols when powered and not responding to AT commands

I am trying to use ESP8266(ESP01) by interfacing it with Arduino using USB power. I followed the given tutorial. When I disconnect and reconnect ESP with Arduino it throws random symbols on the ...
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1answer
772 views

ESP8266 Wifi for http server: What are pros and cons with different libraries/approaches? [closed]

I have found the following options so far for getting an http server running on an ESP8266: NodeMCU exemplified by e.g. this tutorial Arduino ESP8266 library exemplified by e.g Adafruit here mbed ...
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3answers
21k views

Any clever way to provide 3.3V with good current output from a 9V battery?

I'm sorry for any English mistakes as I'm not used with using it when talking about technical stuff. I have been using some ESP8266 WiFi modules with Arduino Mega for a project. They work with 3.3V ...
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1answer
3k views

AT+CIPSEND problem with ESP8266

Here I am facing an issue with ESP8266 CLIENT Programming. The Problem is with AT+CIPSEND Command. This command is working for few times, but after few cycles, it waits too long for "SEND OK". I have ...
2
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1answer
8k views

ESP8266 wont send or receive returns busy s . .

I'm attempting to make a fermentation temperature controller with the ESP8266 sending data to and from my local webserver. I'm testing the esp with the arudino serial monitor and an ftdi board. I have ...
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2answers
347 views

FTDI disappears when powering circuit with it.

I'm trying to us the ESP8266 wifi board and when I power it over the 3.3v out on the FTDI the entire usb disappears from ubuntu. as soon as I take the power away it shows back up again. What could ...
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2answers
5k views

LD1117 not providing fixed 3.3V

It is my first question on this site and I'm probably doing something wrong, try to be gentle! haha I want to provide 3.3V to my ESP8266 module from my Arduino, but people say this WiFi module ...
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2answers
847 views

Is it possible to program ESP8266 from another microcontroller?

I am using PL2303 USB to TTL adapter to program ESP8266, but I do not want to unplug it from system and plug it into PL2303 all the time. That's why I want to program it in system, with my AVR (the ...
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1answer
1k views

ESP8266 “rom” boot code is overwritten when upgrade firmware?

You can flash the firmware using ESPTOOL with a command like ./esptool.py write_flash 0x00000 my_app.elf-0x00000.bin 0x40000 my_app.elf-0x40000.bin this will ...
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3answers
8k views

How to Get IP address from MAC Address using ESP8266 wifi Module

I am trying to use my esp8266 to discover several WiFi devices (sensor) in my home. I only know these devices MAC address, and I need to send TCP packets to their IP address. Using RPi, I can do that ...
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2answers
3k views

How to request “GET” from an ASP.NET website using ESP8266?

AT+CIPSTART="TCP","zgrdataserver.com.azhar.arvixe.com",80 OK, works. AT+CIPSEND=92 The response is ">". Works fine, but <...
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2answers
2k views

Understanding Dividing Voltage

I am attempting to get an ESP8266 to read temp from an analog temp sensor (TMP36). The ESP is on the Adafruit HUZZAH ESP8266 breakout. The board has a single analog pin that I believe will allow me to ...
5
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2answers
11k views

Gibberish output from an ESP8622 WiFi module

Recently I've got myself a couple of ESP8266 modules. I flashed the latest NodeMCU firmware, and tried to communicate with a PC using UART. Here's how I wired my circuit: Using a simple USB to ...
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2answers
6k views

ESP8266 Wifi Module - prints “ready” but not responding to AT commands

Just received my first ESP8266 wifi module with some excitement. However I've been unable to fully communicate with it. I have connected the module to my computer via a usb to serial cable and I'm ...
0
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1answer
976 views

Wi-Fi controlled light; 230VAC - 12VDC/3.3VDC

I try to connect an ESP8266-12 and a 12V RGB LED strip to 230V AC. Based on this link, I've came to the following scheme. This will also be the first time I will etch a PCB myself. The partlist will ...
5
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2answers
4k views

ESP8266 serial-wifi: antenna options

The cheap ESP8266 boards are offered on ebay with two built-in antenna options: with a PCB trace antenna with a ceramic(?) antenna (PCB photographs see below.) Has somebody bought both and compared ...
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4answers
2k views

Esp8266 (esp-03) breakout

Recently, Hackaday is talking a lot about the esp8266, a wifi to serial chip. I want to use the esp-03, a breakout with half-hole connectors that has 2mm pitch. Is there a breakout board that can turn ...