Thanks Henrik and you are right I probably am overthinking this and just trying to do the best possible job posible. About the 2.4Mhz, the Saleae Logic Analyser shows the pulses to and from the sensor. When you look at the pulses from the sensor the pulse width +5v to zero is narrow and the Logic Analyser says the frequency is 2.4 Mhz. Yes, I agree regulators need both input and output capacitors or they can oscillate, pluse you need a "reserve" for powering devices. Thanks again. Best, Ed