Head Lamp

pinshape

I required a headlamp for a location with no light. It's an area where people or other light sources are absent, making it really dark at night. Furthermore, there are no stores in the vicinity where you can purchase batteries. Fortunately, power is available. I therefore created this headlamp that can be charged using a phone charger. The Li-ion battery charger PCB is extremely affordable and cost me 1.5 euros. The battery used is a 4.2-volt type taken from a low-cost Bluetooth speaker. The dimensions of the battery are 34.5x37x5.5mm, but its capacity remains unknown. I utilized PET-G to make it waterproof so that the battery wouldn't get wet. This is also why the power button is located outside the case; otherwise, water (rain) would find an additional hole to enter the case. The LED is a 3W power LED connected in series with a 1 Ohm resistor. This LED is thermos-glued to a plate of aluminum (diameter 46mm x1mm) for cooling purposes. The "glass" is cut from a 2mm acrylic plate (52.9mm). The elastic band (24mm x 1.25mm) was sourced from a tailor shop. As evident, sewing isn't my forte. The headplate has two different dimensions and the photograph depicts the smallest one. The lamp is adjustable using a small M3x20mm screw (you'll also need an M3 nut). The reason the wire from the switch extends all the way to the lamp instead of being directly inside the case is to prevent water from reaching the battery. Li-ion batteries are highly explosive when exposed to water.