CODEWITHSUNDEEP
arduinodigital
Mahdi Alzubaidi
Mahdi Alzubaidi

Reputation: 59

How to prevent Arduino's digital pins goes high on bootup?

I have done my project finally :) , but i noticed that the arduino board on startup it's some digital pins goes high for a bit time 1 seconds or little more! and this causes problem in my project because i'm using it in starting dc motor. I forgot to mention that i have 2 relays connected with arduino and they are triggered on arduino startup or with resetting it, then my code works perfectly. I tried doing pull up resistor and pull down resistor but it seems same situation. Also tried (INPUT_PULLUP) and no result.

Any suggestion please?

Upvotes: 5

Views: 2127

Answers (1)

Matteljay
Matteljay

Reputation: 720

I had the same problem when booting the arduino/connecting to a power source. Only using digitalWrite(pin, LOW) in void setup() did not work for me. Every pin needs to be connected to a physical pull-down 10kOhm resistor in parallel to whatever you're controlling.

Upvotes: 2

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