I'd be inclined to use hardware rather than software myself. If you're careful in resistor selection (I'm thinking of using a SIL network with the microswitches going to ground then you should be able to get steps of 1v as output. Saves having the world's largest IF variable definition.

Hmmm... perhaps a message to R-T might be in order, or failing that I'll have to start writing analysis software from scratch.

OK, I'll admit I'm a bit of a cheap skate. I've been happily using a yaw rate gyro into one of the channels on my DL-1 since I first got it (my serial number is just into 3 figures), and don't really want to spend the money for the all singing and dancing drift angle measuring version. Just thinking...

From the local help:

IF: eg IF(b, case1, case2), If b is not 0, then it returns case1, else it returns case2.

Use the 'IF' operator, i.e. in the calibration for the channel use the scaling (IF x>4,1,0) then when ever the voltage is above 4v you get a 1, otherwise you get a 0 output.

Any chance someone could e-mail the latest firmware to me? I'm running an original (orange connecters on rear) Mark 1

Dave

Use a hall effect current sensor wrapped around the 12v power feed wire. When the valve is triggered, the device will detect current flow and convert it to an analogue voltage that can feed into any 5 or 12v channel on the DL-1

Yes, but you can't do it with the sensor set included in a DL-1 as standard - you need a yaw rate gyro as well. You compare the yaw rate from the sensor with that found by dividing the lateral acceleration by the forward speed and the difference gives you a measure of US/OS. There are a few caveats:...

I think so, I think that open circuit inputs on the DL-1 float at 0v rather than some indeterminate voltage

You might play it safe and have an extra resistor running from the DL-1 end down to earth so that when the switch is open it definitely records 0v.

Just run a single wire from one of your brake light bulbs (the positive voltage side natch) back to one of the 12v analog inputs on the DL-1. You can then just read the voltage (make sure you set the filtering time to 0) in the software - hey presto...

You can scale the analog inputs directly without having to use any user channels. If you go to Data...Variable Manager and the open up the external inputs tree, for each analog channel there is a sensor type/units section. If you select this you can enter a custom scaling using the same formulae as ...

Tim,

The log status output is a sink rather than a source - you'll have to power the LED externally and then use a current limiting resistor in series to the log status pin.

No idea about the beacon input though...

As you're using something other than a DL-1 to do the logging, the Vref is the reference voltage used by the Atmega - it may well be 5v or 3.3v. The calibration figures I posted are based on pure voltage using a 5v reference to drive the sensor.

You can differentiate a variable using a user channel - it's under advanced options. It appears to work on the unfiltered data recorded by the device which may or may not be too noisy for you. As for bandwidth, 100 Hz is more than adequate - the two major resonant frequencieis you'd be interested in...

Put your sensor in series with a fixed resistor of around 20 MOhm. Power one side of the sensor from the 5v input on the DL-1 and connect the other side to the sensor channel you want to use. Finally connect the remaining end of the fixed resistor to earth.