Topics created by AJ Quick

@ChrisP said in M308 and Current Loop Temperature Sensors

Good to hear! Yep CurrentLoop Temp Sensor fully implements the code for MCP3204 and 3208.

The only thing that's a little wonky about it is in that it wants you to input the Low and High values where High is the absolute maximum reading and the Low is 20% of the range.

I've written a simple formula for it to be calculated based on the desired Minimum value:

L=0.2 H + 0.8 MinVal

For example if your range is from 50-120 degrees:

0.2 * 120 + 0.8 * 50 = L

L = 64
H = 120

You should be able to read from 16 ADC using only 5 pins. 😉

@dc42 said in M308 and Current Loop Temperature Sensors:

Thanks, but I won't be able to consider your PR until development on 3.02 has started, because 3.01 is close to final now.

I assume you aren't implementing new features until 3.02? I was hoping this and my SX1509 expansion code were ready to go for the next full release.

@AJ-Quick From where can I get this board?

I've submitted a pull request to have two SX1509 boards available:

https://github.com/dc42/RepRapFirmware/pull/379

Just built the binaries and I am going to go test it with my Duet2.

ajquick opened this pull request in dc42/RepRapFirmware open Add Support for 2 SX1509B I/O Expanders #379

With the corrected (changed) firmware, I am back on the right path. Disabled both the smart drivers and the voltage monitoring. I also changed pinouts so that X,Y,Z,E are my external drives. I believe everything will be working as soon as I get everything else sorted.

As for the VIN shorting to ground issue, that ended up being a faulty bench power supply, and no fault of the Duet or the rest of my setup.

@andres said in Running Duet2 on 5V only?:

Use a little step up-module from 5V to 12V/24V and feed that into VIN. Then you can even control some 12V/24V fans. 2A should be possible.

No need. Everything is external to the Duet.

Pull request submitted: https://github.com/dc42/RepRapFirmware/pull/213

I hope you find it agreeable!

(I also added a bit for selecting between single and differential channels)

ajquick opened this pull request in dc42/RepRapFirmware closed CurrentLoopTemperature Multiple Channels on Chip #213

Follow up update! I have submitted a revision to the Firmware, which hopefully will be accepted: https://forum.duet3d.com/topic/7151/linear-adc-thermocouple-improvements

It is indeed possible to use the MCP3204 or MCP3208 ADC chip with the Duet!

Once the firmware is updated, it should also be possible to use all 4 or 8 channels of ADC in either single mode or differential mode. (Right now, only 1 channel is able to be used at a time).

I was looking at the maximum power on page two for current estimates.

In any case, I just made a duplicate board and connected it to my test printer with a 24 AWG, 3ft ethernet cable and it worked just fine. Literally just plugged it in and it worked. I have a 7ft cable for my main printer coming in on Friday - I expect it to solve the problem.

All ethernet cables are NOT created equally...