The ESP8266 is a low-cost Wi-Fi chip/module with UART connections and a built-in TCP/IP stack.
0
votes
2answers
26 views
Directly driving 5V source MOSFET H-Bridge with 3.3V logic
I am trying to design a H-bridge circuit for my project to drive a thermoelectric cooler (TEC). Basically, I am trying to control the TEC with a voltage source driven by PWM.
Now the problem is, I ...
0
votes
0answers
5 views
Retrive value from thinkspeak using ESP8266 with Arduino setup [migrated]
I just started learning ESP8266 and in my first project I am successfully able to send data to thinkspeak.com using ESP8266 with following code:
...
0
votes
0answers
14 views
Unable to upload lua code into the nodemcu
I am unable to upload lua code into the nodemcu, though AT commands work.
I am following this instructable:
VCC ----> 3.3V Power supply (Vout of LM1117)
GND ----> Ground of power supply
CH_PD ...
0
votes
1answer
45 views
How to maintain gpio state if esp8266 get reset or crash
I am really new to electronic and wish to learn more. Pardon me if the question is inappropriate.
I am trying to turn a led on, off or dim over the Internet. My question is how can i maintain the ...
0
votes
0answers
51 views
Schmitt Trigger (741 op-amp) as noise free zero-cross detector [closed]
I am trying to get my head around the concept of using schmitt triggers and application as zero-cross detector on AC (230v, 50Hz). My problem is that I have a very noisy AC supply, assuming so because ...
2
votes
1answer
115 views
Is this ESP8266 voltage regulator *really* 12v compatible?
I recently acquired some 'ESP8266 SMD Adapter Boards' from Electrodragon. Up till now, they've been working fine. Except... I think I just broke one by attaching it to a 12v power supply. The power ...
3
votes
1answer
106 views
Zero-Cross detector problem
I am really in a tough situation and need very serious elaborative help with this. Almost like spoon-feeding.
It's been days I've been trying to get my zero cross detector (and the triac dimmer) to ...
0
votes
0answers
20 views
ESP8266 servo controler
I am building a small application, that should be able to connect over wifi to server, pull some data and turn a connected servo accord the result. The system should be powered on battery. Is this ...
0
votes
0answers
76 views
ESP8266 sends garbage data always on reset
I am assigned to do a project on IOT using the ESP8266 wi-fi module. For refashing the firmware I also bought a USB-TTL converter and installed the necessary drivers on my PC
I connected the RX and ...
0
votes
1answer
44 views
Transparent Wi-Fi module with RMII input
I need to convert a Ethernet-connected embedded project with wireless connection.
I'm looking for a low-cost (main constraint, less than USD $15) and most open-source/-hardware possible Wi-Fi bridge ...
0
votes
0answers
76 views
LM35 connected to ESP8266 - temperature readings 'spike'
simulate this circuit – Schematic created using CircuitLab
I've connected an LM35 to an ESP8266 (first image below). Every 10 mins I read the LM35 output and post the value to ThingSpeak. ...
0
votes
1answer
92 views
Substituting Arduino for ESP8266 in a (Yet Another!) Garage Door Controller
I have a garage door opener with two leads that will activate the motor if the leads are shorted. I hooked my multimeter into the leads and measured ~24VDC and triggered the motor ~50mA.
Using an ...
2
votes
1answer
67 views
Replacement needed for ESP8266 [closed]
recently i was using ESP8266(ESP-01) with mega8A to log temperature to Thingspeak.com.Setup was running successfully.But after a long run of 4 days,my esp8266 failed for the first time.I flashed ...
0
votes
1answer
76 views
Arduino Bell Detector (Unsafe circuit)
I currently have a circuit that the arduino pro mini checks is the button pressed, the relay will be closed to trigger the bell alarm. And a UDP Packet will be also sent to a server to notify me.
...
0
votes
0answers
39 views
Trying to build a speech detector using a piezoelectric sensor on the throat
I'm currently doing a project on my university in which we need to build a device to detect that someone is speaking (we don't need to understand them). We are using an ESP8266 wifi module to collect ...
0
votes
1answer
73 views
Sending data from STM32F401 MCU to ESP8266 and getting response from ESP8266 to MCU
am working on an STM32f401 Nucleo board and ESP8266 wifi module. I am using Eclipse gcc-arm tool chain and cubeMx to generate code. I can transfer and receive data perfectly with USART/UART DMA.
Now ...
1
vote
2answers
249 views
How to convert 9v to 3.3v and 5v? [duplicate]
I am very new to electronics and hardware.
I want to know how can i convert 9v to 5v and 3.3v using only resistors ?
Basically, this is what i am trying to do -
I want to supply power (3.3v) to an ...
1
vote
2answers
127 views
ESP8266 AT commands to setup a server
I am trying to setup a simple server in the port :80 with a esp8266 module.
I flashed it to the most recent version and it seems to work ... but it is like it doesn't respond to request when I access ...
-2
votes
1answer
51 views
Connect Schneider EM6400 to ESP8266 and call REST API [closed]
I have a Schneider EM6400 meter whose data I need to send to a web-service.
I dont know much about electronics so here it is-
How do I do it? My idea is to use an ESP8266.
But from what I know, the ...
3
votes
2answers
126 views
ESP8266 WiFi module light switch
Info
So I've decided to hop on the ESP8266 WiFi module bandwagon and build a light switch with a couple of differences.
1) the light switch needs to go in the wall and be the same size as the ...
0
votes
3answers
331 views
Safely pull 5V to GND on 3.3V GPIO
I want to control an 5V relay board with an ESP8266 (which operates on 3.3V). Schematic of the board:
IN2 is normally on 5V and must be pulled to 0V for enabling the relay. I saw people using an ...
0
votes
0answers
78 views
Atmega8 and ESP8266 uart problem
I got an atmega8 and an ESP8266. I connected the atmega8 Rx to ESP Tx and Tx to Rx. I don't know why when I power up the communication is not working and the green led from the ESP stay on all the ...
1
vote
1answer
174 views
Unable to send data to Thingspeak using ESP8266 and STM32 Nucleo
I am using ARM's mbed compiler to program my STM32 Nucleo. I am also using an ESP8266 as my WiFi module.
My connections are as such:
Rx of the ESP8266 is connected to D8 on the Nucleo.
Tx of the ...
0
votes
0answers
96 views
Problems connecting esp8266 through HL-340 usb serial adapter on Ubuntu (Input/output error)
No matter what I try I can't seem to get a serial connection going between an esp8266 (this model: http://www.autonomii.com/wp-content/uploads/2015/04/esp8266_pinout_h-569x236.png) and my HL-340 (was ...
0
votes
1answer
96 views
Voltage regulator for esp8266
Below is the link for the famous smt module ESP8266-12E. In the link appears the module and another component which package is 8 SOIC. I am thinking that it should be the voltage regulator for the esp ...
0
votes
2answers
57 views
ESP8266, Vcc and CH_PD oscilation
First, sorrry for my bad english :(
I'm having problems with ESP when I connect CH_PD with 3.3v
My circuit is this:
Simulator: ...
0
votes
1answer
62 views
Powering ESP8266 from pc atx power supply
I am powering my ESP8266 from an orange/black wire from my pc power supply. When i remove and reattach the CH_PD pin from +3.3V (orange wire) both leds, blue and red, flash shortly then start to dim ...
0
votes
1answer
126 views
Does 3.3v ground and 5v ground connected will affects circuit?
I have a wifi transciever(ESP8266) which should be connected to 3.3v and microcontroller connected to 5v(PIC16).
For establishing the communication between the microcontroller and wifi they should ...
0
votes
1answer
52 views
Error on Uploading Program to ESP8266 via Foca v2.2 (USB to TTL Adapter)
BACKGROUND
To test the capability of uploading program to ESP8266, I use an empty program with only a blank setup function and a blank loop function. The result showed me that there are a ...
1
vote
2answers
67 views
Multipurpose momentary button - microcontroller/arduino/esp8266
as more of a hobbyist than a pro I apologise if I'm asking the wrong questions, however I have been researching for a while and hoped Stack exchange might help.
I've read a few articles on low power ...
0
votes
1answer
126 views
Esp8266 - can I use a 3.7v liion cell without a regulator
I'm more of a hobbyist than a pro so forgive me if I'm asking the wrong questions however I have put some time into finding a solution to this problem.
In essence I want to run an ESP8266(esp-12f to ...
-3
votes
1answer
137 views
Voltage divider resistor power disipation [duplicate]
I am trying to create a power supply circuit for the ESP8266, using a voltage divider and a cellphone charger rated at 5V, 1A as power supply.
I have resistors connected like this:
The resistors ...
2
votes
3answers
234 views
solar power ESP8266 microprocessor circuit to turn off when low voltage
I intend to run an esp8266 microprocessor on only solar panels so it is on during the day and off/disabled during low light conditions that do not supply sufficient power.
Is there a circuit that ...
0
votes
0answers
63 views
ESP8266 NodeMCUV3 and WaveShare Dust Sensor
Good evening.
Please be patient, I am just starting my adventure with Arduino-like things being interested in IoT i decided to create myself an Indoor Dust sensor.
NodeMCUV3 ...
2
votes
4answers
256 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 ...
0
votes
1answer
89 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 ...
2
votes
1answer
98 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 ...
1
vote
4answers
209 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 ...
0
votes
2answers
72 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 ...
0
votes
1answer
164 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 ...
0
votes
1answer
453 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 ...
0
votes
1answer
82 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 ...
-1
votes
1answer
813 views
is it safe to use ESP8266 with 3.7V?
i am using an ESP8266 WiFi module in a circuit. the battery is of 3.7V. is it safe to give the ESP8266 (3.3V) directly without a voltage regulator?
1
vote
1answer
214 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 ...
2
votes
2answers
75 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 ...
0
votes
2answers
169 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 ...
1
vote
0answers
110 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 ...
1
vote
1answer
128 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 ...
1
vote
2answers
141 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.
...
0
votes
2answers
334 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 ...
