MOSFET wiring + pattern mode questions
Quick question before I start buying parts — do I really need 3 separate IRF540N MOSFETs, or can I use a single RGB controller module instead? Trying to keep the parts count low.
You need all 3 IRF540N transistors — one per color channel. Each MOSFET is independently driven by a PWM pin (3, 5, 6) on the Arduino, which is what gives you individual brightness control per channel and enables the pattern effects. An RGB controller module would bypass the Arduino's PWM control entirely.
Got the parts! Wired everything up. The basic on/off via checkboxes works great. But I don't fully understand what the 'Sweep' pattern is supposed to do — mine just slowly fades in and out on each channel.
That's exactly right! Sweep ramps each channel from 0 to 255 and back, creating a breathing/pulsing effect. The speed is controlled by the slider position — move the slider higher to slow it down. The really cool thing is each channel (R, G, B) has its own independent timer, so if you set them to different speeds you get a colour-cycling rainbow effect.
Just finished building this last weekend and it looks stunning mounted behind my TV as a bias light! I put the Arduino + Ethernet shield in a small plastic project box from the hardware store, drilled a hole for the Ethernet cable and the power jack. Looks super professional. The 'Flash' pattern at a medium speed with only the Blue channel checked is my favourite ambient mode. 10/10 project.
Leave a reply
You must be signed in to reply