DIY Cruise Control FAQ (2006-2010 Yaris)

[bobor]

Originally Posted by CTScott

OK. In that case, back to your original question - I would not use mechanical relays. I would stick with solid state switching, by transistor or FET, to avoid the switching delays.

Unfortunatelly I do not have any experience with solid state switching. If you could point me to some good tutorial, I would appreciate it But AFAIK in this case, the input signal (voltage level) from either accelerator pedal (hall probes) or DAC would be somehow degradated (lowered) due to voltage drop PN junction.
Solid state switching is definitely faster than mechanical relay. But advantage of a relay is that it does not require power supply to interconnect one of the input lines to the ouput. I though of using this a safety mechanism, so in case anything goes wrong I would just switch off the power supply to cruise control module and the relay would (almost immediatelly) switch back to default state (direct connection of accelerator pedal). But if I find some good solution using solid state, I am about to change my mind.