David Reeves:
Kit Contents
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Unpopulated PCB (front)
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Unpopulated PCB (back)
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stencil
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Alignment of PCB on screen
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solder paste
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solder paste added
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solder paste scraped on screen
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pads covered with solder paste
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3R0 resistor
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pick up 5 3R0 resistors with tweezers
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1K resistor
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Capacitor
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P channel MOSFET
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add capacitor, 1K resistor and MOSFET
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ATTiny85
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Add ATTiny85
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Bend two legs up, squeeze the remaining ones together a bit to match pads
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place modified button on 2 pads
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LEDs, bottom (L) and top (R)
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Add LEDs, cathode (short green line underneath always points to top of heart)
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All components placed
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Preheat reflow station
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Use pliers to move PCB carefully to HOT white ceramic and preheat a minute or two
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turn on overhead heat and melt solder - push around with pliers (still HOT!)
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soldered board (compare shiny melted solder with paste)
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battery bracket
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tin back pads with solder then place battery bracket
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add more solder to battery holder pads to secure, then insert battery
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program chip
