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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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1answer
27 views

Is the parasite mode of a DS18B20 less power consuming than the normal mode?

Description I'm trying to make a few small temperature sensors for in our house and want to go for "low powered battery operation". My current plan is to use esp-now in the esp8266, deepsleep ...
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2answers
32 views

HX711 and 3 load cells

I am doing a small project with ESP32 and HX711 and I need to have 3 load cells. Like this one: I am totally newbie in electronics, my ground is programming. What I found are projects with 1, 2 or ...
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33 views

Get signal from apartment intercom to know when someone ring

In my apartment I have an old intercom to know when someone is at the entrance of the building and to unlock the door. I waned to connect it to an esp8266 to let me know remotely if someone ring and ...
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1answer
36 views

Is it safe to run esp8266 on 3.76V for long run?

I have made a Circuit for home automation and have discovered that my esp8266 is operating on 3.7--3.8V . I want to ask is it safe to use it at this voltage or I have to step it down to 3.3v for a ...
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1answer
23 views

Can the MINI Wemos D1 ESP32 handle 5v on its GPIO pins?

I need to connect multiple data and address pins of a Z80 processor, which runs like the rest of my circuit on 5V, to the gpio pins of a mini wemos D1 Esp32. But I am not sure if the wemos can handle ...
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1answer
69 views

2n2222 with 12v 8mA [on hold]

I have a circuit running on 12v 8mA and I want to get a signal to a GPIO of an esp8266 when current is running. So for that I tried to use a 2N2222 transistor with vcc of the circuit going to the base ...
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2answers
46 views

Using multiple sensors on the same i2C circuit

It’s possible to control multiple pH probes with one single i2C ph circuit (like this https://www.atlas-scientific.com/product_pages/circuits/ezo_ph.html) ? Rather than buying I2C circuit for each ...
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1answer
22 views

TUHS3F05 without other components

I'm planning to use TUHS3F05 for my ESP32 project. I'm very space limited so I need to optimize place as much as possible. In datasheet it is recommended that TUHS* it should be used with other ...
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1answer
38 views

ESP8266-01 Deep Sleep

I have a question regarding the ESP8266-01. Do I need to solder a wire from GPIO16 to reset if I am using a button to wake the ESP module from deep-sleep mode ? Or is it needed only if the module ...
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2answers
27 views

ic to drive either one pwm signal or another

I have an existing RC circuit for a toy truck. Obviously it already has its own mC to receive the antenna signal and output a PWM signal to a motor driver IC. I want to be able to ALSO control this ...
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1answer
65 views

Logic level converter for NodeMCU (ESP8266): Input 24V/16V (Hi/Lo), 500 Baud

I want to use a digital input pin of a NodeMCU board (ESP8266) to read a digital signal. The signal line idles at 24V DC. The logic levels are 24V and 16V. The signal speed is 500 Baud (each signal ...
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How to select a MOSFET when using 3.3v / 5v Logic level [duplicate]

I want to control/dim a 12V LED strip. When using an Arduino, I used a MOSFET IRLZ44N, and a 12V DC adapter - it works as needed. I wish to use same hardware to control it remotely; a Wemos Mini is ...
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2answers
571 views

Is it better to use a MOSFET with a gate driver IC or a MOSFET with a lower VGS,on?

I am building an RGBW controller for my room. I will be using an ESP32 with four MOSFETs for each channel. I want to know which is best for fast switching. Do I need to use a MOSFET driver IC such as ...
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1answer
39 views

NodeMCU GPIO pin interrupt [closed]

When using NodeMCU, I want to toggle the state of GPIO pin, using a physical switch. When the switch is pressed, the switch state should toggle from low to high, or high to low. I know I need to use ...
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0answers
36 views

ESP8266 vs ESP32 and WakeUp vs Reset

Maybe it's my fault but I kinda dislike the design of the ESP8266 when it comes to wakeup from deep sleep via an interrupt. AFAIK (without an external circuit) the ESP8266 can not distinct between a ...
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22 views

How to connect five flex sensors to on esp8266?

I’m using a lolin nodemcu 8266. I was wondering if it is possible to connect 5 flex sensors to one node (to make a glove which detects finger gestures). I’m an experienced programmer but new to ...
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1answer
72 views

Is it possible to use ESP32, BLE4 or BT 2 and WiFi same time?

I am planning to use ESP32 module to transfer data using wifi (ESP32 web server AP)to remote PC and also the same time I need BLE to communicate with a mobile app and get some data to eps32. so I ...
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2answers
64 views

WiFi Module inside a metal body

I am using ESP8266 (2.4GHz wifi) in my product which has metallic enclosure on outside but only plastic on the other side. I will be placing this device outside home near gate. Will it be problematic ...
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2answers
65 views

Best way to connect 5V to GND from ESP (3.3V) - transistor or optocoupler?

First of all: I read through some of the suggested topics (i.e. connecting a 5V relay to an ESP), but to my (limited) understanding, this seems not to be the problem I'm trying to solve. If it is, ...
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3answers
67 views

Opto-isolator to read 30V with ESP8266 3V3 input

I've an old board with an output of 30-31V or 0. I need to read these high and low values with an ESP8266 that works at 3V3. Do you think I can use a PC817 opto-isolator or something similar? Can ...
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1answer
46 views

Use a Mosfet/PNP transistor to boost voltage for mcu pin

I am looking to turn off/on a 5v laser diode with an esp8266 micro controller. The mcu's gpio pins can only take 3.3v. A PNP, NPN and mosfet, among these three which will help me boost the voltage ...
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0answers
14 views

Problem setting registers (SPI) [NodeMCU fw, nRF24L01+]

I can read registers somewhat fine, but when I try writing to a register in the nRF24L01+, it either crashes and I have to pull it out of the board, or the register becomes all 0s, and I can't reset ...
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3answers
62 views

How to interface a C64/Atari joystick port with the ESP8266 (level shifting from 5 to 3.3V)?

I'm working on a device based on an ESP8266 (Wemos D1 Mini) that shall be connected to a C64 or Atari 8-Bit computer's joystick port. At the same time, a normal joystick could be connected (signals ...
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1answer
40 views

Charging and discharging 18650 batteries with TP4056 modules via their power output terminals

I'm having those fancy ESP boards that come with a battery input pins/holders that can be connected to a battery to make them portable. They also have a dedicated USB port for charging/sketch uploads. ...
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1answer
77 views

Interface NodeMCU with RCWL-0516 Microwave Radar Sensor and power via battery [closed]

I am trying to interface NodeMCU with RCWL-0516 Microwave Radar Sensor and power it via battery. Below is the circuit diagram Below is the Arduino Code I am using : ...
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1answer
57 views

ESP8266 ESP-01 internal pull-up at pin GPIO0? +GPIO2 doubt

I have a PCB prototype which uses an ESP8266 module, ESP-01, the first ESP model with a 4x2 male pin header, and I will interface the ESP with a microcontroller. My main doubt is about GPIO0 pin of ...
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0answers
45 views

Flashing a brand-new ESP8266EX with empty W25Q32

I made my own WiFi circuit board using ESP8266EX and a W25Q32 flash (bought from Mouser). My problem is it is not flashing. I used NodeMCU flasher and ESP flashing tool. It only gives boot mode 1,7 ...
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2answers
80 views

How to read multiple I2C sensor (MLX90393) data on ESP32? [closed]

I am using MLX90393 Triaxial Magnetometer Sensors for my project. They communicate via I2C. I am using an ESP32 and coding on Arduino IDE. I found this code on GITHUB and was able to read from ONE ...
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1answer
57 views

Programming ESP8266 in circuit

I've designed a simple WS2812B LED Controller utilizing the ATMega328p and an ESP8266 to connect to WiFi. The two are supposed to be communicating over UART. I've made a mistake of not testing the ...
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1answer
81 views

Activating Relay Coil (NPN and MCU)

Circuit primitive in CircuitJS First, I'm having a hard time with transistors, and only recently managed to pass current through a NPN as planned (70-ish mA from 5 V with a 325 hFE 2N3904 with a 10K ...
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1answer
30 views

esp32 install sdk

I want to install a SDK that is available for the ESP32 arduino. I want to use the esp-idf framework. Is it possible to install the arduino SDK to be used on the IDF framwork. Thanks in advance for ...
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1answer
74 views

Is it possible using two 3.3v LDOs from one SMPS AC-DC 5V to power 2 MCUs?

I'm planning to use two 3.3V LDOs to supply power for two MCUs, one is STM32, one is ESP-12. Input power of these two LDOs come from one SMPS module 5V, 3W (HLK-PM01). The reason for two seperate LDOs:...
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0answers
70 views

12 V PWM fan and Wemos D1 Mini - ground loop?

Newbie here. I'm trying to power a 12 V 4-wire fan and a Wemos D1 Mini from the same power source. The aim is to use a Dallas DS18B20 temp sensor and increase/decrease the fan speed as per the temp ...
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0answers
41 views

esp8266 reset - power consumption

I am working on project with esp8266 UC powered with 3.7v lithium ion battery, where the reset pin is pulled low to keep it OFF. I would like to know if my battery were to be consumed with this ...
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1answer
65 views

WRL-1368 (ESP8266) wifi module briefly flashes blue LED once when powered up, then nothing happens

I bought a WRL-13678 wifi module, but when I connect it to a 3.3V power source, the blue LED flashes once, then nothing happens. I tried powering it from a 3.3V breadboard power supply (connected to ...
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1answer
52 views

Circuit to turn microcontroller on when reed switch state changes (to monitor door lock state)

I'd like to build a circuit that provides power to a microcontroller (ESP8266 in this instance) when a reed switch is changed from closed to open AND when changed from open to closed. This is to be ...
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3answers
166 views

How can I trickle charge NiMH batteries as part of an IOT controller?

I have built an IOT motor controller board that's powered by 4 AA NiMH batteries in series. I want to use a solar panel to trickle charge the batteries, but the voltage slowly decreases even when the ...
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1answer
67 views

Why is JSN giving error readings when powered with Buck converter 12v to 5v different power source?

When I power my esp32 with an USB cable and check the readings of JSN-SR04 it shows correct and consistent readings. But when I connect esp32 and jsn with 5v from LM2596 12V input errors are not ...
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72 views

Flaky GPIO on ESP8266, how do I solve it?

I have an ESP8266 where I took one of the GPIO pins, configured the pullup on the input, then connected it to one lead of a 15m cable and the other lead to the ESP8266 ground. The problem I have is ...
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0answers
19 views

Same software on single ESP-12f slower than on NodeMCU

I have programmed a small software to control an LED strip using an esp. I've written a web app which sends a request to the esp which then applies the color. So far everything works, but I've got a ...
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0answers
48 views

ESP-WROOM-32: Timed out waiting for packet header

I just got back my custom PCB using the ESP-WROOM32 module. I'm using an FTDI with it. GPIO0 is connected to ground via a jumper. I made a very stupid mistake and forgot to include a pushbutton and ...
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1answer
31 views

DHT22 doesn't transmit to NodeMCU V0.9

I am developing for the NodeMCU V0.9 with the NonOS SDK and can't get it to communicate to a DHT22 sensor. Wiring: 3.3V on NodeMCU -> + on DHT22, Ground to - and pin D1 to signal, there is a 6.8k ...
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2answers
121 views

Whats the purpose of 0R in Sonoff POW [duplicate]

I'm designing my own Sonoff with ESP32, with power monitoring capability. Now before I start my own design, I took a look at Sonoff design. In the Sonoff POW the power metering IC has a 0R resistor, ...
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0answers
88 views

MOSFET not giving out full 12V

I'm using three IRLB8721 MOSFETs to power my LED strip. Through an ESP-12F I'm delivering 3.3V to each gate, which should bring me a 12V output, I think. But this doesn't work, I only get 5.8V - 7.6V (...
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1answer
51 views

What is single and multi connection mode( AT+CIPMUX=0 or 1) in esp8266 AT commands

I was studying the AT commands to program atmega328p for the communication with esp8266. Now I am confused with the command AT+CIPMUX=0 or 1 , it explains that 1 for multiple connection, 0 for single ...
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2answers
89 views

ESP32 FCC Certification

I want to build an esp32 device using the esp32-pico-d4 chip that I will sell to hobbyists. However, I recently came across something called the FCC. It requires radio devices to get certified which ...
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1answer
137 views

In HLW8012 schematic, where should the Referenced ground be connected

In the datasheet of HLW8012, the both 33nF capacitors , 1K resistor and 0.1uF capacitor are connected to GND. I'm not sure where should I connect those ends of components marked with GND symbol, (To ...
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0answers
56 views

ESP8266 Webserver not reachable after 2 minutes from reset

I have a Keyes Espressif ESP8266 NodeMCU, I have two LEDs that I want to control which are connected to the ESP. When I open the webpage http://10.0.0.5/5 after ...
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2answers
60 views

How to hook four strain gauges ( 5 wire) to esp32

I have four strain gauges (50kg) with 5 wires each (red, black, white, green, yellow) and want too measure weight of a platform. I assume those should be hooked to hx711 load cell amplifier and esp32 ...
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1answer
49 views

which is faster GPRS vs 4G on arduino?

I am using Sim800 GPRS to send data to MySQL server online. I use Arduino mega 2560 for one update in MySQL, it takes 1-2 seconds to run required AT commands If I use a 4G module like SIM7000E will ...