Efficient way to get multiple Analogue voltages out of a microcontroller?
You could use DACs or you could use PWM outputs from the MCU. Quad DACs are available and I've used one recently from MAXIM - it was a 12-bit version and was controlled from the MCU via a serial link. You could easily add several of these depending on how many voltage outputs you need to generate. I believe MAXIM also produce a DAC with 32 outputs!! Just checked - it's a MAX5773 (edited) 14 bit DAC