Problem coverting a 5V analog signal to a 20 V digital signal (suggestions?)
Problem coverting a 5V analog signal to a 20 V digital signal (suggestions?)
(OP)
Hi,
I am looking for something to convert a 5V analog signal to a 20V digital signal. I am not sure if an I/O board or a A/D board is the best option, or perhaps something different. Does anyone have any suggestions or recommendations for a particular board or solution for this problem? Also, I am hoping to have the output 20V signal to be a minimum of 12 bits. Thank you!
I am looking for something to convert a 5V analog signal to a 20V digital signal. I am not sure if an I/O board or a A/D board is the best option, or perhaps something different. Does anyone have any suggestions or recommendations for a particular board or solution for this problem? Also, I am hoping to have the output 20V signal to be a minimum of 12 bits. Thank you!





RE: Problem coverting a 5V analog signal to a 20 V digital signal (suggestions?)
TTFN

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RE: Problem coverting a 5V analog signal to a 20 V digital signal (suggestions?)
RE: Problem coverting a 5V analog signal to a 20 V digital signal (suggestions?)
RE: Problem coverting a 5V analog signal to a 20 V digital signal (suggestions?)
RE: Problem coverting a 5V analog signal to a 20 V digital signal (suggestions?)
Not meaning to be too critical here, but the word "just" implies that you've provided a complete description of a trival problem that requires only a quick part number answer. These manifold assumptions are most likely untrue.
Scotty might be on the right track, but we will only be sure if you more fully described the details.
Analog input signal: 0 to +5v?
Digital output: 12-bit resolution. Parallel? Serial? Format?
20 volt: huh? Weird! Source? Sink? Load? How much current?
Speed? Update rate? Requirement for clocking?
Etc.
RE: Problem coverting a 5V analog signal to a 20 V digital signal (suggestions?)
Best to you,
Goober Dave
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RE: Problem coverting a 5V analog signal to a 20 V digital signal (suggestions?)
I have attached a visual schematic of the current set-up. Our ultimate goal is to be able to read force values from the load cell into our computer. In order to do that, we must have a 20 V digital [binary (on/off)] signal going into the adept controller's JDIO3 port (Part No. 30350-10352). The load cell is a JR3 100M40A. The transformer is our power supply for the load cell. The transformer is providing the 5V analog signal to an A/D board (1 input) and we are converting it to a 5V digital signal (8 outputs). The A/D board is a NI USB-6009 (http://sine.ni.com/nips/cds/view/p/lang/en/nid/201...) and the total current coming out of the A/D board is 68 mA (8.5 mA per output). We then used an operational amplifier to boost the voltage from each 5V digital outputted from the A/D board to 15V digital (here is where the problem with this set-up is, because we need 20V digital). The operational amplifier that we used was an LM324N (which can only boost our voltage from 5V to 15V). The operational amplifier circuit was done on a Global Specialties PB-10 (http://www.alliedelec.com/search/productdetail.asp...).
The problem with this set-up is that we would ideally like to purchase one piece of equipment that could do all of this work for us (perhaps with LabVIEW or some other software). We feel that this will cause us to experience a delay when taking force readings from the JR3 load cell, if we can ever create a 20V digital input to the Adept Controller.
- I have talked with the local Adept distributer near where we are located, and he suggested a TTL Booster(Transitor-Transistor-Logic) in order to boost the digital signal.
- Also, I have contacted National Instruments, and they directed me to NI CompactDAQ devices (which would eliminate the A/D Board and Operational Amplifier from the current set-up).
I apologize if any of this is still unclear. Please feel free to ask me to clarify anything, if any important information has still not been answered. Also, an alternate solution method suggestion would work for us as well. Thank you all very much for your help.
RE: Problem coverting a 5V analog signal to a 20 V digital signal (suggestions?)
What's marked JDIO3 appears to be an output.
TTFN

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RE: Problem coverting a 5V analog signal to a 20 V digital signal (suggestions?)
RE: Problem coverting a 5V analog signal to a 20 V digital signal (suggestions?)
-AK2DM
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RE: Problem coverting a 5V analog signal to a 20 V digital signal (suggestions?)
TTFN

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RE: Problem coverting a 5V analog signal to a 20 V digital signal (suggestions?)
I Googled "JDIO3" and the 400-page Adept manual popped right up as the top hit.
If this Adept controller has any flexibility, a different input might be better than forcing a single data word into a row of discrete input I/O pins.
A consideration you might not have considered is that you would have to latch your data word so that the bits are not changing as the Adept scans across the bits. Hint - that's why nobody would ever do it this way.
According to Table 5-5. DIO Input Circuit Specifications (page 112/402), the threshold is about 8 volts. A garden variety single ended OpAmp would be able to provide this input.
Don't forget to latch the data and consider how you'll avoid timing problems if the transitions are not synchronized with the reading cycle.
I'd find a way to interface it using a more suitable port. The basic problem is you've decided to use an unsuitable port.
Good luck.
RE: Problem coverting a 5V analog signal to a 20 V digital signal (suggestions?)
I must be missing something here- if the above is the goal, then all you need is the load cell, its conditioing electronics and the PC/USB-6009.
If you are insisting on taking the load cell value sampled by the 14 bit 6009, then decimating it 8 bits to send it to the Adept then your resolution is going to be pretty coarse (not sure what 5V full scale on the load cell represents).
Also, the digital ouputs on the 6009 are not hardware timed, they are at the mercy of your loop rate and subject to jitter and delay from the OS. Estimating ~750 Hz max rate.
-AK2DM
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"It's the questions that drive us"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
RE: Problem coverting a 5V analog signal to a 20 V digital signal (suggestions?)
Dan - Owner
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RE: Problem coverting a 5V analog signal to a 20 V digital signal (suggestions?)