My programme works in simulation but does not when downloaded onto a picaxe 18m2. The wiring connections are all checked and double checked. The programme turns a 12v motor on and off depending on number of revs determined by magnet passing reed switch. A fairly simple on of code works but once I add a "let b0=b0+1" it does not seem to respond to that bit of the code (but the simulation works). Could the chip be faulty? Thanks for any help.