This morning, I analyzed every components in order to get the voltage and the peak current. I looked at the pololu 3pi data-sheet how does the power supply work.
The pololu supplies 3 tensions:
- Vbat : from the battery (3.5V-6V)
- Vboost : Vbat with a boost module (9.25V) for motors and IR diodes
- Vcc : Vboost with a linear regulator (5V) for logical electronics
Since every components are compatible with 3.3V or less, we can take Vbat without having a lack of voltage at any time. Only IR transmitters must not be supplied with more than 1.7V, we will use resistors in order to decrease the tension. The energy loss are not so big because the transmitters don’t work every time. We chose a buck switching regulator to get the 3.3V from the Vbat.