These are higher than the operating voltage of microcontrollers, but well within range of many transistors.Ĭurrent - The current that a lamp needs should be listed in its technical specs, but often you’ll only be given the wattage. Voltage - The most common voltages for DC lamps are +12V, and +24V. When you start to plan a DC lighting project, remeber the relationships between voltage, current, resistance, and electrical power:Įlectrical power (wattage) = voltage * current These are not controllable using the method described here. To control low-voltage DC lamps from a microcontroller, you’ll need a separate power source, and a transistor that’s matched to your voltage and current needs.īe alert when shopping, as there are many LED lamps that operate on high-voltage AC on the market as well. In contrast, low-voltage LED lamps are relatively easy to control from a microcontroller. Although it is possible to control AC dimmer circuits from a microcontroller, it’s both more complex and less safe than working with low-voltage DC circuits. Until recently, if you wanted to control the lights in your home or office, you needed a control circuit for high-voltage AC power. The spread of LED lighting has made it much easier to create domestic lighting projects. This project is maintained by tigoe Controlling Low-Voltage DC Lamps A collection LED control examples for Arduino
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