DIYEFI.org Forum

I'm noticing something that doesn't make sense to me on the original Hellfire implementation. The firmware calculates the pump current by "V(Ip) - V(2.5)", but the amplifier circuit looks to be referencing the gain to point "Rcal" instead of the 2.5V Vgnd. To implement what I thi...

Wow, great thread guys! Tons of info here. I'm new to the group and have a desire to do basically the same project (LSU 4.9 + Arduino). Just starting to wrap my head around the original (Hell Fire's) schematic, but I also like Joey's analog/opamp concept. Looking forward to seeing where it goes from...