My friend and I are building a telemetry system for a baja car to measure transmission temperature, fuel level, RPM, etc. that would include a wireless module for realtime monitoring as well as an SD card for backup, all powered from (probably) three 1.2V NiCd AA batteries in series with a voltage booster to get 5V. From past experience building a circuit to boost the voltage from AAs to 5V, I found that when load is applied to the circuit, the voltage will droop below 5v. Because we are going to be using ADC converters in our setup that use a reference voltage of 5V, will the droop in voltage effect the results of the data? If so, what can we do to combat this?