“This is a modification of my simple IR light dimmer v1 that you should also check out. Modification is mostly in hardware so that dimmer does not require both phase and neutral wires to operate. I am releasing source code for this v2 version for you to modify and have fun! This device is connected to mains power line therefore it requires a lot of respect. If you are not sure in what you are doing, you better leave the installation part to the experienced electrician. Even though this device operates on 5V DC, when connected to mains voltage it can still kill you if you touch any part of it! You can safely assemble it on your bench, but once it is connected to the mains, DO NOT TOUCH IT!”