[Noisebridge-discuss] XO diy pulse monitor hardware and software

[jim]

   Today at 2169 a guy brought a small circu‎it he'd 
created and software he wrote that shows one's pulse 
on the oscilloscope activity on the XO laptop. 
   his circuit is simple: an infrared transceiver 
that shines light on a surface (a finger) and detects 
the reflected light, sending a diff to an op amp that 
amplifies the signal and sends it as a line out audio 
signal through a mini-phone jack that connects to the 
line-in input on the XO computer. (the thing he 
showed us was built on a $2.00 miniature breadboard.) 
   the software processes the signal and presents it, 
oscilloscope style, to the o'scope activity. 
   he said he'd send a schematic, BOM, source code, 
and maybe some references, which i'll share after i 
get it.