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1500 questions
4
votes
1 answer
powering Nodemcu using Vin
Forgive me for this really dumb question. I am an amateur in electronics, and im trying to wrap up my head around this question and im not able to do so. Need your help.
Im trying to power up a nodemcu using a 5v 1A power supply- I connected +ve to…
bukke hari prasad
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4
votes
2 answers
Is it possible to extract a hex file via UART from an Arduino?
Right now I am tinkering on my 3D printer that has an Arduino mega as a brain. I need to update the Marlin firmware but in case of an error I want to create an backup of the firmware. And because it is assembled using a shield on top have no access…
Coder_fox
- 686
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- 14
4
votes
4 answers
ESP8266 not connecting to WiFi
I am trying to send the temperatures from an DS18B20 to ThingSpeak, using an ESP8266. You can see the code I am using for that.
When I run the code I do not get any errors. In serial monitor it just shows that it is not connected to WiFi. If I…
Ali Karim
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4
votes
3 answers
Can I remove soldered atmega328P from arduino board, using hot air gun, without damaging it?
I need to remove atmega328P from arduino board and the best tool what comes up to my mind is a hot air gun. What is the maximum temperature that atmega328P can withstand?
Kirill
- 151
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4
votes
2 answers
sprintf() to assemble String and float pieces locks up
I'm trying to parse many variables into a URL so that I can update a website through a simple HTTP API with sensor data. After talking to a buddy of mine, he suggested going with the code below.
When I put this in, the Arduino Yun boots up. I see…
Pat
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4
votes
0 answers
Send custom 802.11 data frame with ESP8266
I would like to send raw 802.11 data frames in order to transmit pictures with the ESP8266.
I have the Espressif SDK 1.3 and so far I have tried to construct a packet and send it with wifi_send_pkt_freedom, but it didn't work. I cannot pick it up…
Alex M.
- 141
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4
votes
1 answer
Arduino Uno R3 to Wemos D1 R2 project migration - Pinout problems
So i've chosen to purchase a Wemos D1 R2 board in order that my old Arduino Uno R3 projects can get some new IoT features. However, even if my code is working in Uno perfectly, i want to test it using D1 before adding features. My problem is that,…
Galinho Salonica
- 89
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4
votes
1 answer
ESP8266 PHP Web Server
I need my ESP8266 web server to load my website files with .php extensions. So far I managed to load .htm .css and .js files from my SD card, but when I upload PHP files on my SD card, they won't run. How can I do that?
Kirill
- 151
- 2
- 2
- 12
4
votes
1 answer
Can I get the current connection speed with ESP8266?
Using an ESP8266 I can get the RSSI of the Wifi network using Wifi.getNetworkInfo() or Wifi.RSSI(). But is there a way to know the actual connection speed in Mbps, after joining successfully a WiFi network?
FarO
- 339
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4
votes
1 answer
Controlling an LED using SIM900A and Arduino
How can I turn the LED on and off using a received text message?
The sim card is able to receive the message but I can't change the pin status. I also can't see anything in the serial monitor upon reception of the message.
Below is my…
Shadrick Katawa
- 41
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4
votes
3 answers
Very Basic Arduino Uno Serial.readString() operation
I am very new to Arduino Programming.
I am trying to identify the input string from serial monitor and printing the output to the console accordingly
Code is :
void setup() {
Serial.begin(9600);
}
void loop() {
while…
KarmaCoding
- 113
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4
votes
4 answers
Using millis() to toggle an LED every 500 milliseconds
I thought the code below would toggle an LED every 500 milliseconds. But it does not work. I'm not able to catch the mistake, which must be very silly.
void setup() {
pinMode(3, OUTPUT);
}
void loop() {
unsigned long cnt=millis();
if(!(cnt %…
Rajesh
- 171
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4
votes
1 answer
Is there GUI to flash a sketch with new variables?
I'm dabbling in a project and would like to add a feature, but I need some help from the community.
My project returns a response from the wunderground api and lights an led based on the temperature in the response. I plan to enclose the circuits…
KidaStl
- 41
- 2
4
votes
1 answer
Purpose of USB (FTDI) and ICSP connectors
As an Arduino newbie I am a little bit confused about possible ways of programming and communicating with this device. I have done some research and it seems that:
ICSP is used for programming with a bootloader in MCU.
The USB (FTDI) port is used…
azrael
4
votes
3 answers
Detecting if a push button was pressed and released
I want to detect if a push button was pressed and released again. So I thought the right approach would be to first wait while the pin yields LOW and then wait while the pin yields HIGH:
void push(int pin) {
// wait until button was pushed…
Patrick Bucher
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