Electric Cup / Glass / Bowl warmer or heater (USB Option)

thingiverse

This is an experimental design that I created, so I decided to build a simple model to hold everything...(I know you can buy it anywhere, but you can make it with recycled materials too). Okay, I used the round plates of several hard drives for both the heating part and the cover. This design uses some resistors to heat an aluminum piece. Of course, you can modify the number of resistors, but I recommend always maintaining the total resistance value. I will use 16 resistors of 10 ohms/3 watts connected to a 9-volt DC power source. You can use another combination, but keep in mind that you need to achieve 500 milliamps with 5 volts...900 milliamps if you use 9 volts and 1.2 amps if you use 12 volts. To get that, you have to use a total resistance of 10 ohms. If you only want to use 5 volts, you can connect this heater to a USB 2.0 or higher version. In addition, you will need a 5mm (4.8mm) LED and an 180-ohm resistor if 9 volts are used to power the circuit, and 100 ohms if 5 volts are used, connected in series. This LED will alert you when the device is on or off. Check out one of the attached pictures as a scheme... I use 16 resistors of 10 ohms, but the final resistance is 10 ohms...I hope you understand what I mean. You need some basic electronics knowledge to create this heater! You can build this object and electronics under your own responsibility! You may get hurt, burned, or burn your office or kitchen if you don't know what you're doing! You can also use an old computer processor, but make sure to use a multimeter to achieve about 500 milliamps with 5 volts...900 milliamps if you use 9 volts and 1.2 amps if you use 12 volts. I recommend not using more than 9 volts. 9 is enough. You can heat your coffee or tea. With 5 volts, it will keep your cup warm for a longer time than without this heater... but it won't heat it up. I'll add an on/off switch, but I didn't have one at the design stage. I need to get one, and it will be more convenient to turn the device on and off. I highly recommend using a flat-bottomed cup or mug. The heat will transfer better. If you use the cover, the heat will be retained better, and your coffee or tea will warm up faster.