So far they seem to have exclusive access to Subaru, Suzuki etc diagnostic tools and Subaru support (eg unlock codes).   Almost every garage I called gets parts from them in the region so they set prices.   Not all parts are actually genuine! They get cheaper parts and don’t tell you, which I found out today from their parts department. But those cheaper parts arent sold much cheaper. Not to mention the $250-375 scanning fee for diagnostic if they don’t know what the fault is already. Though services include a scan for cheaper.   Combined with nearly $250 an hour labour rate seems like they are really milking it.

Well turns out JavaScript is more hassle than c. Finally after a couple of days the TPMS scanner now sends a nice webpage with a sorted list of discovered sensors. So all you need to do is select which one and which number you want it save it as.   The current arbitrary limit is 16 sensors that it will learn. The c code is a single line #define sensor-count 16 to change but the JS isn’t linked so has to be manually updated at the same time. The last piece is how sensor data is sent over canbus. The plan is to send the sensor number and mac address the first time it is seen. Then just sensor number and pressure every time the sensor broadcasts data. Sensors only send data on average every 10 minutes or so. Unless they detect a leak over time or a rapid change. Once they stop they send a idle message and go to sleep about 15 minutes later.    

Some aero updates from previous generations.    

There have been a few places making complex gyroid mathematical shaped coolers (YouTube link) for a while. Now metal printers are cheap enough for intercoolers in more mass produced vehicles. Making water air intercoolers even more compact and efficient.     YouTube: https://www.youtube.com/watch?v=1qifd3yn9S0 intercooler: https://www.confluxtechnology.com/product/gas-liquid-heat-exchangers/water-charge-air-cooler/      

Still working on the web side of the TPMS as need to figure out how to run scan and get feedback as scanning is a heavy load and blocks the web server while running. Will likely add a scan time for user to set rather than 5 seconds. That way you can have a 5, 10, 20, 30 second option giving time to get the sensor to wake up and start broadcasting.   Some you can just blow on, others need to be atmospheric then 20psi+ and last lot require a lot of movement. Movement ones can take the longest to wake up, eg put in a bag and spun around. Had to learn a bunch about Bluetooth packet headers to write a custom parser since the built in one decodes far more than needed for beacons like tire monitors.   Another area I’ve been looking at, is aerodynamics which other than wool tufts needs measurement. I already have some aircraft vortex generators fitted. Anything aerodynamics related costs way too much money or have very limited use. Making 8 channel sensor set doesn’t look expensive compared to to the 1-10k price for an off the shelf device. Sensors can be a mix of single point measurement or dual point(differential) ones, eg single measures absolute pressure and differential you place a tubes from the sensor to top and bottom of wing and it measure the difference.