Hi Guys, Lately I am been getting a few jobs that require me to look into the correct functioning of the Injectors circuits on a vehicle. I can do a few tests like injector resistance, but really the way I thought about doing this, on a 4 cylinder vehicle at least, was to build a breakout box which would allow me to measure voltage and current. For voltage and to check timing I would then connect it to a 4 channel scope. For current measurement I was thinking about using one of the LEM current sensors but probably one of the allegro sensors would be fine, then again could use scope to check any inconsistencies. There are some methods that exist already like the NOID lights but they test one injector at a time. This would be a test that would check the all circuit in one go. I do have some connectors for one type of injectors and would probably have to get a few different ones. What do you guys think. Is there anything that already exists that I can base this on? Thank you. Luis On 26 Feb 2015 21:45, "Josh Koffman" wrote: > Hi all, > > Many years ago I designed a little remote indicator circuit. Nothing > too fancy. It communicates over RS485 at 250kbps. Similar to DMX, but > not quite the same. > > I've recently had the idea to make a few new ones, but remotely > powered. I'd like to try to vaguely follow the power over Ethernet > (PoE) ideas as I think it would be an interesting design challenge. > The basic idea is to apply a common mode voltage to the differential > pairs. > > The power side is fine, I can work that out. What I don't know is if I > can use an Ethernet pulse transformer for a different signal. On the > surface, it seems plausible as both are differential signals. But I > would guess my speeds are significantly lower, and I have no > experience designing anything like this. > > Am I totally out to lunch, or might this actually be possible? > > Josh > -- > A common mistake that people make when trying to design something > completely foolproof is to underestimate the ingenuity of complete > fools. > -Douglas Adams > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .