I was able to a get an integrated LCD, Arduino and the particle sensor working. The Class for the LCD, and particle sensor is too large for a small Arduino. When I tried to pare it down, it failed to work. After an hour of debugging the answer was not obvious. I will contact the manufacturers for a C library and use an ARM microcntroller. But this can be significant work and time. Arduinos, although well documented, are best for one or two things before resource conflicts, like timers. I can use a more powerful Arduino, but then the cost is higher. I found a Raspberry Pis to somewhat sensitive to voltage ripple, and also hard to diagnose remotely. I prefer to go custom early, before I reach a rathole of too many unknowns. Many people more talented with Arduinos and Raspberry Pi's, and can do amazing things I haven't mastered. But I make real products for a living, and customers open the case, no matter what you do or say. Even if it works flawlessy for a year, they don't like it and say it not "real" engineering and a toy.