A BJT-based relay driver uses an NPN transistor to let a low-power digital signal control a higher-power load safely. The Arduino output provides a 5 V logic signal, which cannot drive a relay coil directly due to current limits. The base resistor (1.8 kΩ) limits base current and protects the microcontroller. When the Arduino pin goes HIGH, base current flows, forward-biasing the base–emitter junction at about 0.7 V. This turns the transistor ON and allows a much larger collector current to flow
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