GreenLeader
Senior Member
Well I am pleased to say that I have practically completed my first proper picaxe project. It took about a year but I have built and tested the prototype. I got a lot of help from this forum, either browsing posts or from vey helpful answers to my questions. Still a few bugs to sort out, but in the main its working well.
It's a 7 channel logger for my car - a bit like a black box recorder.
It all started because I wanted to verify the turbo boost pressure - the dashboard gauge has graduations, but no numerical markings, so its hard to tell if you could be over-boosting. Then it grew into other things.
So I ended up with a 40X1 logger with 3 "high speed" channels (up 10 Hz each) and 4 slave channels running at 1/5th of the masters. Master sample rate selectable by switches on the panel.
Masters are engine rpm, boost pressure and road speed.
Slaves are ambient temperature, intake temperature and two spares (plan to use them for oil temperature and pressure later on).
It has 2 modes - streaming and standalone. In standalone it automatically starts logging when powered up (when you start the car). It writes to EEPROMs, enough to record at 10Hz for 54 minutes, but at the lowest rate (1Hz) you get about 9 hours. Has a circular mode to keep only latest data if preferred. Upload speed is a bit slow - takes about an hour at 115200baud.
In streaming mode it can stream continuously to a connected PC running a terminal program to collect data indefinitely (about 9-10Hz on all channels)
Has a 4x20LCD to give the user some feedback about what's going on..
Attached a is graph of a typical recording and a photo of the logger..
It's a 7 channel logger for my car - a bit like a black box recorder.
It all started because I wanted to verify the turbo boost pressure - the dashboard gauge has graduations, but no numerical markings, so its hard to tell if you could be over-boosting. Then it grew into other things.
So I ended up with a 40X1 logger with 3 "high speed" channels (up 10 Hz each) and 4 slave channels running at 1/5th of the masters. Master sample rate selectable by switches on the panel.
Masters are engine rpm, boost pressure and road speed.
Slaves are ambient temperature, intake temperature and two spares (plan to use them for oil temperature and pressure later on).
It has 2 modes - streaming and standalone. In standalone it automatically starts logging when powered up (when you start the car). It writes to EEPROMs, enough to record at 10Hz for 54 minutes, but at the lowest rate (1Hz) you get about 9 hours. Has a circular mode to keep only latest data if preferred. Upload speed is a bit slow - takes about an hour at 115200baud.
In streaming mode it can stream continuously to a connected PC running a terminal program to collect data indefinitely (about 9-10Hz on all channels)
Has a 4x20LCD to give the user some feedback about what's going on..
Attached a is graph of a typical recording and a photo of the logger..
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