Digitalread not set back with button

Projects Programming
1

Hello,

I am feeling really dumb with this question as this should be so simple.
Trying to get a reed switch triggering something on a D1 Mini. So I just thought this should just work like a simple button and tried this code:

int led = BUILTIN_LED;     
int button = D5; 
int temp = 0;   

void setup() {
  Serial.begin(115200);
  pinMode(led, OUTPUT);   
  pinMode(button, INPUT); 
}

void loop() {
  temp = digitalRead(button);
     Serial.println(temp);
     if (temp == HIGH) {
        digitalWrite(led, HIGH);
        Serial.println("Button open");
        delay(1000);                
       }
     else {
        digitalWrite(led, LOW);
        Serial.println("Button pressed");
        delay(1000);
        }
}

However once triggered / pushed the temp = digitalRead(button); doesn´t get set back to open, I even tried to force a set back after the delays but it doesn´t happen. Then I thought the reed got stuck but the same behaviour happens when I just use a wire as button.
Circuit: 3V3->10 k resistor->D5->button->GND

2

It ALL depends on how you have BUTTON wired. Is it grounded when not presses or is it +5 when not pressed?

3

well, it is on +5 if open through the resistor

Circuit: 3V3->10 k resistor->D5->button->GND

should this be

GND->10k->D5->button->3V3 instead ?

4

Either should work, or you can use the internal pull-up resistor.

D5 == GPIO14 which was no pull-up/down resistors on the wemos board, I believe.

Attach some bright, clear, close-up photos of the circuit so we can check your wiring.

5

Sorry, just found the bug in the system, the VCC wire was too lose on the breadboard. :roll_eyes:
Thanks to you all for the quick assistance anyway!

6

You need one of these:

https://create.arduino.cc/projecthub/madmark2150/perf-panel-paired-power-plug-piggyback-for-mega-2560-67d604

7

it's more conventional to wire the switch between the pin and ground, configure the pin as INPUT_PULLUP to enable the internal pullup and check for LOW.

one of the reasons the pin can be configured with an internal pullup

8

FYI
Suggest you wire switches as S3 is wired.

Make software changes looking for a LOW on switch push/closure.

1 Like
9

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.