I have been working on an eBike control project on the Arduino MEGA2560. The program runs 3 PID control loops, one battery capacity control loop (interpolation based on lookup tables), a speedometer (samples based on a Reed Switch) as well as a LCD screen to display information. Its inputs are 3 analog signals: battery voltage, current and user throttle input as well as a digital input: speedometer (reed switch) on/off signal. Currently, with all this running on "long" aritmetic the Arduino manages to complete 10 loops per second. As the TFT LCD screen takes tremendous amounts of computational power, I am thinking of replacing it with an Alphanumeric screen.
The OUTPUTs consist in an analog throttle signal going to a motor controller, the LCD screen and potentially a few other devices requiring analog signals. Thus, ADC converters are essential and DAC would be very useful although I am currently using the Arduino PWM output with a RC low pass filter. Similarly, the capacity to read digital and analog signals without interrupting the processor would be great.
I would like to potentially make a consumer product out of this. Hence, I want to build my own platform from the groundup with a different microcontroller that could give me at least a 100 samples per second (10 times what the Arduino is achieving). Also, to avoid floating points, my calculations use long variables and numbers consequently superior to 16bit, so I'm assuming a 32bit MCU would be a good idea. Also, a MCU able to do floating points calculations could be interesting to simplify the maths in the code.
Is there any particular brand or environment where I could find all I need and be able to move easily from the Arduino MEGA?
Thank you for your help!