Am I missing why you can't run two sensors?
Am I missing why you can't run two sensors?
Kenny_McCormic wrote: I forget how exactly narrowband works, does it actually need to range from 0-1, or just bounce back and forth? If you just need back and forth a simple level shifter circuit and straight digital would be fine. If you need a true analog, knowing the sampling rate would be helpful.
For what I'm going to use it for, it needs to range from 0-1. Again, the TEC II allows one to program the response from volts to a/f, and while it expects one would program in the standard response- it's possible to put whatever I want in.
The sensor system I have is a 0-5v signal, which is actually in a 1-3V for the realistic response. But I can't do just a simple volt conversion, as the trend is backwards from what the TEC expects- and one can't program it backwards.
Ok, The output response would be codded to mimic an actual narrowband sensor. Doesn't sound too difficult.
Let me do some checking. I think my samples are a bit iffy near the low end but it may be a simple resistor change to get em to run in the zero to one volt range.
oldopelguy wrote: Am I missing why you can't run two sensors?
Yes, I want my old TECII to use a UEGO to run closed loop all of the time. That means I need to change the output as I'm describing.
Or I go with a MS set up. I have the TEC in a cabinet in my garage, the MS is not here.
Cant you just use a DC to DC converter and invert the output?
In reply to NOHOME:
Dunno. What I'm concerned about is ground. But it's worth a try...
Easy analog problem, easy analog solution.
Your first stage is an inverting op amp, gain -1/5. This gives your flipped signal, -1 to 0 VAC. Your second stage adds 1V DC to it; it consists of a voltage divider to go from your DC power source to 1V DC and a summing op amp circuit.
I'd be amazed if you couldn't do this for $5. Email me at vactrac@. gmail.com and I'll mail a schematic back.
chaparral wrote: Easy analog problem, easy analog solution. Your first stage is an inverting op amp, gain -1/5. This gives your flipped signal, -1 to 0 VAC. Your second stage adds 1V DC to it; it consists of a voltage divider to go from your DC power source to 1V DC and a summing op amp circuit. I'd be amazed if you couldn't do this for $5. Email me at vactrac@. gmail.com and I'll mail a schematic back.
(forehead smack) I can't believe I didn't come up with this, well done sir.
Yes this is a pretty simple circuit to design. Stick with analog components. Ignore andruino or anything else that you need to program. That is like using deep blue to tell you that 2+2=4.
You will pay more for shipping than for your components if you buy from mouser or a place like that. Buy multiples of everything if you solder like me.
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