It is a normal resistor connected in a concrete way to a pin of our microcontroller. What is a pull-up resistor?Ī pull-up resistor is not any special resistance. This can cause the state of our pin to vary between 0 and 1, and end up giving false positives. To avoid interpretation errors, the circuits have a noise margin that allows them to interpret the signals as HIGH or LOW even though the voltage is not exactly 0v or 5v.įLOAT, is when a pin is not in a fixed state and fluctuates (for example a loose cable connected to an Arduino pin). Of course nothing is perfect, and the signal is not going to be exactly at 0v or 5v (resistance and noise of the cables for example). In digital electronics, 0 and 1 are used to transmit data, and since you cannot send a number 0 or 1 through a cable, voltage values are used to indicate each of the states.įor the HIGH or 1 state a value of 5v will be used, and for LOW or 0 a value of 0v will be used. Yes, but I found it interesting that you knew the ways in which our Arduino pins can be. What? But we weren’t going to talk about pull-up and pull-down resistors. What is HIGH, LOW or FLOAT in digital electronics? This type of resistance will help your Arduino not be affected by electrical noise and receive errors in your measurements such as false pulsations on a button. Hello, today I bring you a basic tutorial about the pull-up and pull-down resistors, and the INPUT_PULLUP input mode of the Arduino pins.
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