Head Lamp

myminifactory

I required a headlamp for a location with no light whatsoever. The spot I'm headed to has no other people or light sources, so nighttime becomes an inky blackness. Additionally, there are no nearby stores where I can purchase batteries, but fortunately, power is available. Thus, I constructed this headlamp, which can be charged using a phone charger. The Li-ion battery charger PCB proved to be quite affordable and cost me only 1.5 euros. The battery in question is a 4.2-volt type that I salvaged from an inexpensive Bluetooth speaker. Measuring 34.5x37x5.5mm, the dimensions of this battery are unknown due to its capacity. To prevent water ingress, I utilized PET-G to create a watertight seal around the battery. Consequently, the power button is situated outside the case. If it weren't for this precaution, rainwater would simply find another way in through an extra hole in the case. The LED employed is a 3W power LED connected in series with a 1-ohm resistor. This LED is thermos-glued to a plate of aluminum (46mm x 1mm) to maintain its coolness. The "glass" component was cut from a 2mm acrylic sheet (52.9mm). I acquired the elastic band (24mm x 1.25mm) at a tailor's shop, as sewing isn't really my forte, as you can plainly see. The headplate is available in two different sizes, and the photo showcases the smaller one. Furthermore, this lamp features an adjustable design, thanks to a little M3x20mm screw (which also requires an M3 nut). I routed the wire from the switch all the way to the lamp instead of directly into the case to prevent water from reaching the battery. As you're probably aware, Li-ion batteries are extremely volatile in the presence of water.