As the heading, is this possible?
Short and swift....have some GUI software (simpledyno) that appears to accept only analog on aux inputs via com port and thought this may work.
Any ideas on how to connect etc.
Was thinking a load cell via the HX711 to the dac and then feed back into an analog input on the Arduino for transmission to the PC GUI via the usb lead.
That sounds like it is very messy to say the least.
Can you post a link to the HX711? Is it just a part or have you got it on a breakout board?
No.
The MCP4725 accepts I2C inputs as a slave only and outputs an analog voltage.
The HX711 needs something to give it a specific sequence of clock pulses and it outputs a series of pulses that need to be assembled by something into the result.
That something is usually a microcontroller, like this:
load cell -> HX711 -> Arduino -> whatever
Although in theory you could use the HX711 to convert the output of the load cell to digital, and then use the MCP4725 to convert it back to analogue, I see a problem:
The HX711 is relatively slow, it can only do either 10 or 80 conversions per second. What if your dynamometer is expecting to read from it's analogue input at a faster rate?
I think you would be better to connect your load cell to an instrumentation amplifier, and keep the signal as analogue until it goes to your 'aux input'.
This also has the advantage that no new software is involved.
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