2 blinking LEDs (red being the colour of love) operating on 3V. Some blinking LEDs are clearly underpowered on 3V. The ones from Opitec (n° 236135
) work great.
2 SPDT switches with a long lever. I use the cheapest available at Conrad (n° 703673-8A
). They come with a wheel at the end of the lever, which is not used as wheel, but helps keeping the lever end in the head construction.
2 button cell batteries, 3V each. I use two CR 2032 for my design. Other batteries with other dimensions would need an adaptation of the design of the part holding the battery.
2 bolts M4 x 35 mm, 2 bolts M4 x 20 mm and 4 nuts M4.
4 washers fitting M4 bolts.
2 neodymium magnets 5 mm diameter X 15 mm length (The design can be adapted to more common magnet sizes like the ones available from Opitec
2 neodymium magnets 8 mm diameter X 4 mm thickness (e.g. n°208305
2 pieces of foam tape, 3 mm thick, about 5 x 5 mm
6 mm clear acrylic sheet (laser cut). I choose 6mm because the common SPTD switch is 6.5 mm thick, so it will be firmly held in the layered build up. You need clear or translucent acrylic sheet to have the LED shine through.
The design for the laser cutting is provided below. I made it in Inkscape. The design gives the parts for one robot only. I couldn't fit two on a Pponoko P1 sheet. I was planning on adapting the design to fit two robots one P1 sheet, but instead I am thinking of making the robots slightly taller, and changing the proportions to bring the LED closer to where the human heart is.
Apart from a laser cutter or laser cutting service, there are no tools required.