This is a quick file to let you build a Xiaomi Mi Band 2 charger with a laser cutter.
The design is licensed CC-BY-SA 4.0.
Materials:
- 60mm x 30mm of 3mm thick Plywood. You can use some other lasercuttable material, as long as it's at least 2mm thick.
- 3x1 right angle pin header, with 2.54mm spacing
- Some solder
Tools:
- Laser cutter
- Soldering iron
- Needle-nose pliers
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Cut
xiaomi mi cradle.svg, with the following settings:- Cut black lines first
- Cut red lines last
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You may need to clean up the pin holes, with a drill. Use a 1mm bit. The holes are 5.08mm apart, or 8mm from the edge of the piece.
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Remove the middle pin from the right angle pin header.
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Put the Mi Band screen-down into the cradle, so that the pads are on the side with the small holes in the cradle.
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Insert the long side of the pin header (no plastic) into the wood. This should fit snug, and protrude about 2mm.
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Bend the short side of the pin header (with plastic) slightly so that it lines up with the pads. You will need to bend the pin header down while the Mi Band is not in the gradle in order to get proper force.
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Apply a small amount of solder to the pin header on each side of the cradle to hold it in place.
With the band's screen facing you:
- The left pad must be connected to ground
- The right pad must be connected to +5v
The Mi Band shows a charging indicator when it charges, and draws about 55mA.
Note: the current drawn may be too low for some USB battery packs to stay on. If it has two ports, plug another, higher-draw device into the other socket, such as a mobile phone.
Pictures: