I was on travel this weekend and tested the Tire Pressure Monitoring System (TPMS) project on the long road trip. The sensitivity of the receiver is not what it needs to be to pickup all four tires. Previously I was able to pickup the signal from all four tires with a longer antenna, however during this trip only two tires seemed to be received consistently while the other ones would only be received once in a while, but most of the time were not received at all.
I suspect that the reason for the difference may be due to the tires being rotated and the two older sensors may be in the rear, and further away from the receiver or it may be that the placement of the receiver was different enough to cause the signal to not be heard. I plan on digging into this a bit more but will continue to focus on rewriting the code for the TPMS project then attempt to resolve the issue with signal strength. It may simply be that the configuration of the radio needs to be adjusted to improve the gain of the received signal.
