Hi As I see in the technical documentation of the r2c2 borad there are two ARM processors in the processing sub circuit the both processors have the same name LPC175X when I tried to consult the datasheet of the LPC 175x I discovered a range of processors of type LPC175X but I didn't know which two could I use in the R2C2 board As you see in the picture that I captured form the board documeby MASNSN - Next Wave Electronics Working Group