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Ohm’s Law is fundamental in electronics, describing the relationship between voltage, current, and resistance. It is essential for designing and troubleshooting Arduino sensor circuits to ensure proper operation and safety.
Basics of Ohm’s Law
Ohm’s Law states that voltage (V) equals current (I) multiplied by resistance (R), expressed as V = I × R. This relationship helps determine the correct resistor values and power requirements for sensors connected to an Arduino.
Applying Ohm’s Law in Circuit Design
When connecting sensors, it is important to calculate the appropriate resistor to limit current and prevent damage. For example, if a sensor requires a specific voltage and current, Ohm’s Law can be used to find the necessary resistance.
Suppose a sensor operates at 5V and needs a current of 20mA. The resistor value can be calculated as R = V / I = 5V / 0.02A = 250Ω. Using this resistor ensures the sensor receives the correct current.
Common Applications in Arduino Projects
- Limiting current to LEDs
- Sensor voltage divider calculations
- Controlling motor speed with PWM
- Protecting input pins from overvoltage