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1500 questions
4
votes
1 answer
How do you convert a formatted print statement into a string variable?
I'm using the following routine to print the current time on the com port. I would like to capture this as a string so I can display it using ePaper.
void printLocalTime()
{
time_t rawtime;
struct tm timeinfo;
…
Simon Markham
- 43
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4
votes
1 answer
How to listen to multiple server ports with ESP8266?
I'm using WeMos D1 R2. I'm trying to listen to both ports 1992 and 1993. This is my current code:
#include
WiFiServer server_1992(1992);
WiFiServer server_1993(1993);
void setup() {
Serial.begin(9600);
WiFi.begin("MySSID",…
MoonFan
- 43
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- 5
4
votes
5 answers
Arduino Yun external antenna
Can someone help me understand how the external antenna IPX connector actually stays connected to the Yun? Do I have to "force" it in so it snaps in? I've been somewhat gentle with it in fear I'll break something. However when I get close to getting…
Pat
- 217
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- 10
4
votes
1 answer
Interrupt fires a random number of multiple times for one pulse
This is my first time posting on this forum. I have tried to format this question properly, but let me know if I need to correct anything. I searched to see if someone else had a similar problem, but let me know if someone has already answered this…
Bryan Kinzer
- 41
- 2
4
votes
2 answers
Is there alternative to arduino IDE program ESP8266 and ESP32 with arduino toolchain?
I use ESP8266 and ESP32 with arduino toolchain rather than pure arduino hardware.
Arduino IDE is standard and proven but what are the other IDE and advantage/disadvantage ?
E.Racineux
- 107
- 1
- 2
- 11
4
votes
5 answers
What does Arduino do in 15ms?
I was wondering why there is a 15 ms delay between each iteration of a the main loop.
Code:
The following code shows the execution time expressed in microsec between each loop
void setup()
{
Serial.begin(9600);
}
void loop()
{
…
UserK
- 559
- 1
- 11
- 24
4
votes
2 answers
Why do people complain when I call my functions voids?
I have posted questions about "my void loop" or "my void setup" and people complain that they aren't really voids. But they are! See this example code:
void setup() {
pinMode(13, OUTPUT);
}
void loop() {
digitalWrite(13, HIGH); // turn the…
Nick Gammon
- 38,883
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4
votes
1 answer
Turn off the second builtin Nodemcu 0.9 led
I'm making a low energy consumption device so I'd like to turn off all the led when I'm idle.
Unfortunately the nodemcu turn on a blue led while I'm idle (during delay(ms))
Here is my code:
#define LED 16
void setup() {
initialSetup();
…
Timmy
- 195
- 2
- 12
4
votes
1 answer
How to switch an external circuit with Arduino?
I have an object with a series of led and I want to turn on and off these leds from my Arduino. The input of the LED circuit is 24v DC 100mA.
What I've done is the following:
I've cut a wire of this object and I connected one end to the collector…
Alessandro
- 143
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4
votes
1 answer
Is there a way to disable modules like ADC without a sleep mode?
I'm working on a binary watch project. I want my circuit to live off of batteries for as long as possible, so I want to decrease the power consumption of my chip.
I'm using a barebones ATmega328P-PU with two 74HC595 shift registers. The ideal…
thallia
- 43
- 1
- 4
4
votes
1 answer
Modbus RTU controller monitoring with arduino and RS485 module
I'm a medium user in Arduino. I baught a pHmeter controller with RS485 output (MODBUS RTU protocol).
I want to get pH value read by the controller over RS485 module and Arduino.
According the controller's manufacturer, we should operate as…
Teddol
- 85
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- 8
4
votes
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
- 75
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- 9
4
votes
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
- 143
- 4
4
votes
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
- 41
- 2
4
votes
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
- 143
- 1
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