Questions tagged [esp8266]

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

Filter by
Sorted by
Tagged with
1
vote
1answer
52 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 ...
0
votes
2answers
29 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 ...
1
vote
1answer
92 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 ...
0
votes
0answers
55 views

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 ...
6
votes
2answers
623 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 ...
0
votes
1answer
46 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 ...
1
vote
0answers
43 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 ...
0
votes
0answers
24 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 ...
0
votes
1answer
515 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 ...
0
votes
2answers
110 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 ...
1
vote
2answers
99 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, ...
0
votes
3answers
152 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 ...
2
votes
1answer
61 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 ...
0
votes
0answers
15 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 ...
0
votes
3answers
84 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 ...
1
vote
1answer
53 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. ...
0
votes
1answer
235 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 : ...
0
votes
1answer
280 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 ...
0
votes
0answers
62 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 ...
0
votes
2answers
173 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 ...
0
votes
1answer
79 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 ...
0
votes
1answer
92 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 ...
0
votes
1answer
40 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 ...
1
vote
1answer
91 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:...
1
vote
0answers
90 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 ...
0
votes
0answers
52 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 ...
0
votes
1answer
76 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 ...
2
votes
2answers
127 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 ...
3
votes
3answers
209 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 ...
0
votes
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 ...
1
vote
0answers
74 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 ...
0
votes
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 ...
0
votes
0answers
62 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 ...
1
vote
1answer
34 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 ...
-3
votes
2answers
206 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, ...
0
votes
0answers
91 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 (...
0
votes
1answer
95 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 ...
0
votes
2answers
115 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 ...
0
votes
1answer
397 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 ...
0
votes
0answers
65 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 ...
0
votes
2answers
119 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 ...
0
votes
1answer
55 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 ...
0
votes
1answer
202 views

NodeMCU ESP8266 DHT22 reading nan (2147483647)

I am new to electronics and microcontrollers and hope this is the right spot on StackExchange. I have been playing around with an Arduino Micro, connecting different sensors and a display and display ...
1
vote
0answers
84 views

What would be needed to read USB keyboard input on the 8266 or ESP32 chip?

My objective is to read input from a Keyboard Wedge device (i.e. Hand Scanner) which will emulate a keyboard entry and a carriage return and then broadcast that information to the cloud. I think I ...
0
votes
0answers
61 views

ESP32 with LNA and PA

I would like to add a low noise amplifier and a power amplifier to the ESP32. As you may know there is only one RF output on the chip. I was thinking of adding an RF switch, and switching between ...
7
votes
7answers
1k views

Trying to get (more) accurate readings from thermistor (electronics, math, and code inside)

So I'm trying to get accurate temperature readings off this TDK B57164K472J thermistor... It's connected in series with a 1 K resistor, and connected to an ESP8266's onboard ADC. The thermistor has ...
0
votes
3answers
956 views

How to measure AC current using ACS712 and interface with ESP32?

Actually, I want to measure the AC current using ACS712 connect with ESP32 module. I know this module only works under 3.3v. So, I used voltage divider circuit and step down 5v to 3.3v which is being ...
1
vote
0answers
181 views

Proper capacitors for ESP8266-12F?, resetting at high current peak

When using the ESP8266-12F on a PCB I designed myself it keeps resetting after a high current spike of another module (Sim800L). I ofcourse tried to solve this using capacitors but I seem to have made ...
0
votes
2answers
100 views

Making a wireless lavalier microphone with ESP8266-07

I'd like to make a lavailer microphone and receiver using two ESP8266-07 Wifi modules. I'm using a condenser microphone with it's own preamlifier using 5V. I want to compare my signal with 300kHz ...
1
vote
0answers
32 views

Is Wemos D1 R2 compatible with micro python?

I wonder if Wemos D1 R2 ESP8266EX compatible with MicroPython and editable using uPyCraft. If so please say so.