Social Distancing Laser Hat

thingiverse

Mark your personal space with the Social Distancing Laser Hat! This innovative device will draw a circle of approximately 2m radius around you, alerting you if you're too close to someone or if they're too close to you! Video: https://www.youtube.com/watch?v=lmvdseag7vk I'm using a 1mW Class 1 laser, which is harmless to eyesight (but don't stare at it). Bystanders would not be in any danger. Full Fusion 360 model available here! https://a360.co/2VNXtfa Bill of materials: * 3D Printed parts as per Fusion 360 model. I printed on a Prusa MK2.5S MMU2S, using PrusaSlicer and the default 0.35mm FAST profile, which worked flawlessly first time. * 2 off skateboard bearings 22mm x 8mm x 7mm * 1 off 6V DC geared motor * 1 off 4xAA battery holder with switch * 4 off M3 x 5mm screw (button/pan/socket head, etc., not countersunk) * 1 off M3 x 8mm screw * 4 off M3 screws for mounting to hat, length selected according to particular hat (mine are 18mm) * 5 off standard M3 lock nut - 4 for mounting the module to a hat, the 5th is held captive in the laser holder, then the M3x8 screw is threaded through it to lock the shaft. I haven't included any screws or nuts in the F360 model because I'm lazy. The lower skate bearing probably isn't necessary. If using one, adjust the user parameter BEARING_REQUIRED. Laser - Choose one with a sliding switch rather than a momentary pushbutton so it stays on. Mine is 16mm in diameter. If using a different laser pointer, the 3D model will need adjusting. This can be done (to an extent) by adjusting the user parameter LASER_DIAMETER. Some other tweaks may be required if vastly different. Bearings - Any 22mm OD x 8mm ID x 7mm thickness skateboard bearings will do. I have a stash of Bones China Reds: https://www.amazon.co.uk/dp/B000FDRQ1S?ref_=pe_3187911_264767211_E_301_dt_1 Battery holder - 4x AA with switch and 15cm wires. Probably available everywhere, UK and USA links for exact model below. UK: https://www.ebay.co.uk/itm/AA-x-4-Enclosed-Battery-Holder-Box-with-Switch-15cm-Wires/281526444568?hash=item418c48a218:g:PQ8AAOSwnDxUiJ75 USA: https://www.ebay.com/itm/4X-AA-DIY-Battery-Holder-Case-Box-6V-5V-With-Power-Switch-Bare-Wire-Ends/253572474000?hash=item3b0a18e490:g:7oMAAOSwmcBa2TqX Hat: Any rigid hat will do, ideally one with internal strapping or a liner so the mounting screws don't dig into your head. A builder's hard hat or skateboard helmet would be fine. Choose one that you don't mind drilling holes into.