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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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2
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1answer
57 views

Wake ESP8266 based MCU on contact close/open

I am trying to build what I thought was a relatively simple system (think deadbolt detector), that will fire an event when a simple switch changes state. Currently, I am testing with an ESP-01 and an ...
0
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1answer
38 views

How to stop erroneous signals on startup of an RF circuit

I have a really janky setup where I'm using an ESP and some transistors to "push" the buttons on an RF remote control, used for controlling electrical outlets. The circuit works perfectly during ...
0
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1answer
56 views

Start ESP (Wemos D1) for short amount of time by pressing a button (no deep sleep)

How can I let an Wemos D1 boot on a button click, letting it execute an action and then shut down. I would like it to be wireless so it can be very flexible, and would love to not have to worry about ...
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1answer
72 views

Control ESSP8266 IOT board over cellphone hotspot wifi [closed]

I am using the following code in order to control my ESP8266 using my cellphone hotspot. ...
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0answers
228 views

esp32 resets when relay switches from ON state to OFF state

When I switch a 12v relay from ON to OFF using esp32 then the ESP is restarted. Also it happens only when there is an AC load. I control 12V relay with a transistor. This is my relay How to solve ...
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1answer
233 views

Voltage divider Vout not powering ESP8266 [duplicate]

I have an input voltage of 12V from my power supply and i need 6V to feed into the ESP8622. I was giving it all the 12V but the wifi module becomes increasingly hot with time and so i decided to have ...
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1answer
94 views

What if I connected +5V from one source and GND from other to arduino [closed]

I'm just asking... What if I connected +5V from one source and GND from other to Arduino Will it work? EDIT simulate this circuit – Schematic created using CircuitLab Will it work? or ...
0
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1answer
102 views

Programming esp8266 NodeMCU (with Arduino IDE)

I just got some esp8266 NodeMCU chips, which I want to use for IoT. I understand that these chips are programmed with Lua code. Is this correct? I found online that I can program these chips with ...
0
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1answer
189 views

What components do I need to add to the power circuit for this ESP8266 project?

I'm planning to make some controllers for each of the electrical heaters in my house. The heaters use a pilot wire to control their mode of operation: I'm following this project to control the pilot ...
1
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2answers
154 views

Impedance-matched antenna with an extra capacitor

I'm looking at the a schematic for an ESP8285 module, and I am curious about what they are doing with the antenna. The module is the PSF-B85 (by ITEAD: the version with a chip antenna). The antenna is ...
0
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1answer
98 views

Schematic failure in I2C connection

Hi, I've built the schematic shown in the picture. It is an ESP-12 module that should communicate via I2C to the MPU6050. However, the communication seems to be disturbed. The clock and data line ...
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1answer
476 views

How to send data to an ESP32 with as little delay as possible from an Android app [closed]

I have an ESP32 module. I want to send data to it using an Android app. I tried using http but the delay is big especially since I want to send about 20 values per second with a delay between 50 to ...
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1answer
971 views

ESP32 logic HIGH/LOW level voltage, not working?

From ESP32 datasheet: In my case: VDD = 3.3V Vil (max) = 0.25 * 3.3 = 0.825V Vih (min) = 0.75 * 3.3 = 2.475V Theoretically: LOW LEVEL range is -0.3V to 0.825V HIGH LEVEL range is 2.475V to 3.6V ...
0
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1answer
56 views

ESP-01 boots with GPIOs HIGH

I'm trying to implement a "button pusher" with some transistors controlled by an ESP-01 module, to push buttons on a remote control. I'm having an issue where if when the GPIOs (I'm using 0, 2, and 3) ...
0
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1answer
130 views

Registering IOT products across Europe based on NodeMCU

We've been designing some smart home devices and softwares in past few years and they've been sold in some countries in middle-east. Basically, they were combination of ESP, Arduino and NodeMCU boards ...
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2answers
1k views

ESP32 max input voltage UART

Before doing any mistake, can you confirm me that it is not possible to connect directly UART pins of Arduino UNO on UART pint of ESP32 ? I see on the datasheet a voltage of 3.3V. I would like to ...
0
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2answers
252 views

ESP8266 - PULLUP resistor using Arduino code

I'm having some trouble with this ESP8266, to switch UP, DOWN, OFF dual relay, using Arduino code and a physical 3 states switch. The code defines input GPIOs 12,14 as ...
1
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1answer
266 views

button which wakes up the esp8266 from deep sleep, but can be used as common button

The goal is to have a button which wakes up the esp8266 from deep sleep, but can be used as common button while the code is running. This is a follow up of an unsolved Arduino SE question. esp8266 ...
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0answers
255 views

What damage occurs in an ESP32 when you power it with 5V

A colleague flashed the PIC MCUs on a batch of boards. However he didn't pay attention to set the Vdd when programming to 3.3V and used the default (5V). This caused the ESP32 on board to experience ...
-1
votes
1answer
381 views

Hook up 2 HC-SR501 PIR's to Wemos D1 mini

I have two HC-SR501 PIR's I'd like to use to detect motion and light up a 12V LED strip when motion is detected (each PIR is assigned a LED strip). I am, however, unsure on how to hook them up to my ...
-1
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1answer
418 views

Why doesn't Arduino Nano provide enough current to ESP8266?

I have an ESP8266-01 WiFi Module and I have some troubles in supplying power to it. I use an Arduino Nano powered by a 9V battery (actually 6x 1,5V AA) through the Vin pin and the GND pin. I power the ...
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2answers
596 views

Can I use series diode to drop voltage from Lithium Ion battery to ESP8266?

Ideally I would use a low dropout regulator but I can't. I also don't have access to a suitable buck boost converter. The best alternative I have (and also my plan B) is to boost the Li-ion battery ...
1
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1answer
143 views

Turn on/off ESP8266 by a transistor

I would like to turn off and on a circuit by another circuit. I believe that could be easily achieved by a transistor but when there is a voltage regulator and an ESP8266 with wide range of input ...
3
votes
1answer
938 views

ESP8266 - free GPIOs for relay switching

I'm using a NodeMCU as shown below, to switch 4 relays using Micropython. For that purpose I need 8 GPIOs (4 for relay and 4 for switch buttons). For the first pair (UP/DOWN) I use pins D1, D2 - for ...
0
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1answer
570 views

using a TIP120 Darlington transistor to control a 12v fan from an ESP32 board?

I plan on making a version of this circuit to control a 12v PC fan using an ESP32. The ESP32 GPIO pins are 3.3v logic level. https://imgur.com/a/iqOfcME You can ignore the lower part of the circuit ...
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1answer
545 views

ESP8266 - should Vin pin supply 5V?

I'm using this ESP8266 board, which has a Vin pin. This link - says specifically that Vin get a direct 5V from USB's DC. But ...
-1
votes
1answer
384 views

Level shifting with 74HC245 3.3V to 5V not working for WS2812b [closed]

I'm trying to drive a strip of NeoPixels/WS2812b using an ESP8266 controller. To do so I'm using an external power supply (5V/10A effectively more like 5.6V) and a 74HC245 to shift the 3.3V data line ...
2
votes
0answers
152 views

ESP8266 sleep current is higher than it should be [closed]

In short: Despite setting my datalogger IMU to SLEEP and going to deepSleep(0) on the ESP without any other IC peripherals besides the buck converter and 2 deactivated LEDs, I still measure 2.5mA ...
0
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1answer
75 views

5V USB and 110VAC proper procedure?

My apologies in advance if this has already been asked I have a MCU (esp8266 or esp32) which will primarily live off mains power with transformer 110VAC -> DC 3.3V Occasionally USB is plugged into ...
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1answer
152 views

LED display flickering when connected to an ESP8266

I'm building a simple clock using an ESP8266 chip and a 7 segment LED display which is driven by a HT16K33 chip. The ESP8266 uses 3.3V, the display can handle 5V. I want to use a simple USB cable as a ...
0
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1answer
193 views

What happens when a LIPO drops under 3V? WeMos in DeepSleep doesn't start up again?

I have a Lipo (18650) which is charged by a solar panel (6V/6W + TP4056 charger). It's feeding a WeMos D1 Mini which is put in DeepSleep every 10 seconds. When it's awake, it sends something to ...
0
votes
2answers
121 views

How to detect RF / Wifi radio device nearby

I wonder if there is a way to detect if there is any RF/WiFi radio ON nearby? I'm configuring an ESP8266 12E module in STATION MODE (not Access Point) to connect to a Wifi network (any Wifi network). ...
0
votes
1answer
366 views

SPI interface, ESP 07 connect to MCP 3008

I'm trying to connect an MCP3008 to an ESP07 through the SPI interface. (A bidirectional level 5V - 3.3V is used in between but it doesn't matter) However this is not working because: The CS pin is ...
0
votes
1answer
224 views

Trigger input with varying input voltages

Currently I am trying to build a circuit, with the goal of triggering a pin of an ESP8266 from varying input voltages (in the range of 5 to max 15 volts it should get triggered). Also the input should ...
1
vote
4answers
2k views

Which kind of AA battery should I use to power up my ESP-32

Disclaimer : I have few knowledge in electronics I have an ESP-32 device that use 3.3V to run perfectly. The 3.3V and the Ground of the device is directly connected to an AA battery container with ...
0
votes
0answers
75 views

LOW pins on ESP32 during flashing and normal boot

I use ESP8266 in my project. Now I'm going to change to ESP32 (datasheet). For ESP8266, I know GPIO4 & GPIO5 are always LOW, during the flashing or normal boot. Using these pins can simplify the ...
1
vote
1answer
197 views

ESP8266 module emits random/garbage characters on external supply (but works on arduino's 5v & 3.3v)

Summary: With arduino's 5v & 3.3v supply , ESP8266 module emits boot messages and responds to AT commands on serial terminal@115200 baud as - boot message: ...
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2answers
833 views

5V output switching with WEMOS D1 mini + MOSFET

I have a WEMOS D1 mini board which I power with a 5V power supply. I need to switch 5V outputs with a few hundred mA load, so I use AO3400 N-channel MOSFET-s. My schematics are the following: However,...
-7
votes
1answer
128 views

Can esp8266 chip work safely in a circuit with 3.3v and 1 ampere current? [duplicate]

I am using ams1117 to convert 5v/1A DC to 3.3v/1A using - https://iotbytes.wordpress.com/3-3v-power-supply-for-esp-8266/. Can this 1 amp output (measured via ammeter) damage the esp8266 or i need to ...
2
votes
0answers
636 views

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

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
votes
1answer
309 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 ...
0
votes
1answer
92 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
83 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?
1
vote
2answers
79 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 ...
0
votes
1answer
275 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
273 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
138 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 ...
0
votes
1answer
68 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
83 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
1k 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 !