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1500 questions
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4 answers

Elegant solution for refreshing TFT display content?

I'm currently drawing black boxes over old content before displaying constantly refreshing content on my display, so for instance to display temperature: if (sensorTemp != nowTemp){ nowTemp = sensorTemp; …
Streamline
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3 answers

Can I force Arduino not to be powered by USB?

I'm building a 3D printer and I'm using an ATmega2560 + RAMPS board. The whole thing is powered by an ATX PSU (12v for motors and stuff, 5v for the Arduino), but when I plug in my USB cable, I can't shut the printer down, as it switches over to USB…
Valmond
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4
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1 answer

Two Arduino boards - one IDE

Have been using UNO MEGA for small projects. Recently bought an UNO for other projects. Can I just go into the IDE an under Tools select UNO and a different port to do projects and rename sketches to keep track of sketches. Do not wish to use boards…
Kathleen Weymouth
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5 answers

Powering a 5V Arduino Pro Mini with 3.3V

I want to run the 5V board at 3.3V because I can get the 5V version cheaper than the 3.3V version. I read that you can power the Arduino Pro Mini with a battery by connecting the battery to the 5V pin, bypassing the regulator. Somewhere else I read…
laktak
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4
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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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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
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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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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
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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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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.
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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
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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
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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
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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
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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
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