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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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0answers
28 views

Connecting the display from Nokia C100/1616 SPI TFT to ESP-12

I'm trying to connect the display from the Nokia C100/1616 SPI TFT to the ESP-12. Attempts to implement connection examples from Arduino did not lead to success. I do not have experience. Ankit asked ...
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0answers
35 views

How can I measure RSSI of an antenna with an Arduino? [on hold]

How can I measure RSSI (Received signal strength) of an antenna with an Arduino? Is it sensible to use ESP8266 with Arduino for this?
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0answers
12 views

Convert a four-wire relay to work in a two-wire setup?

I'm an electronics newbie who's been working on a project to try to control my baseboard heaters at home. They operate at 240V. I bought a whole bunch of Sonoff Basic WiFi switches, which are ...
0
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1answer
46 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
54 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 ...
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1answer
65 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 ...
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0answers
21 views

Mosfet switches high-vs-low for ATTiny circuit switch

What would be the pros and cons of using either a high-side p-channel vs. a low-side n-channel to turn an ATTiny LED circuit on and off? Is either one better for a mostly-off or a mostly-on type ...
2
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0answers
48 views

ESP8266 sleep current is higher than it should be

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 ...
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1answer
59 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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0answers
66 views

3.3v signal to drive 5v relay [duplicate]

I am reposting a question with more details, hope you will be kind enough to share you knowledge with me - I am currently playing around with a NodeMCU 1.0 - ESP8266 and having trouble switching on ...
0
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1answer
53 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 ...
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0answers
52 views

ESP8266 Wireless Light Switch - UK Mains

I'm looking at making my UK light switches "Smart" and controllable via Wi-Fi and have come up with the following and wanted some advice on what I have so far: namely, will it work as I think it will ...
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0answers
108 views

Simple HB100 speed acquisition

I'm looking to build a speed meter based on HB100. I find some topic/post/tuto talking about building amplifier to exploit HB100, but it is too complex for my low knowledge and tools. I wonder to ...
0
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1answer
89 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 ...
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2answers
58 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). ...
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1answer
54 views

Removing and connecting VCC could not reset ESP8266 when in deep sleep? [closed]

When Esp8266 is in normal mode removing and connecting vcc restarts my ESP8266 module. But when the same is done in deep sleep it does not restarts. It only restarts when Vcc is removed and connected ...
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0answers
38 views

How easy would it be to program this ESP8285 implementation?

This question has more to do with the physical pcb than it does Arduino. If you know where I should be posting this question, please comment and I will move. I figured I would find like-minded people ...
0
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1answer
39 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
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1answer
32 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
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4answers
200 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 ...
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0answers
31 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 ...
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0answers
16 views

Use BLE module to make Wireless Sensor Network

I am new to BLE module communication and need to know can 2 BLE can talk to each other if one is connected with a microcontroller and another is connected with the sensor via UART connection which is ...
1
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1answer
64 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
102 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,...
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1answer
42 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 ...
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0answers
40 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
62 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
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1answer
71 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
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1answer
48 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 ...
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1answer
56 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
48 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
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1answer
99 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
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2answers
64 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
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1answer
91 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
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1answer
41 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
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2answers
56 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
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1answer
128 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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1answer
57 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
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0answers
46 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 ...
0
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0answers
24 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
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2answers
211 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
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2answers
101 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 ...
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3answers
67 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
47 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
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1answer
52 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
472 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 ...
0
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0answers
122 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....
0
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0answers
140 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
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1answer
59 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, ...