Author Topic: DIY-SMU Project  (Read 6914 times)

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Offline wergor

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Re: DIY-SMU Project
« Reply #50 on: March 14, 2021, 06:54:28 pm »
I love and hate such threads... love because I learn a lot, hate because I see how far I still have to go ;D
very interesting project. I'm designing an open source SMU myself (but I'm going in a different direction: +-24V, +-3A, no UI, instead it will be a module for a NI PXI / EEZ BB3 type system), your writeup, schematics and this thread have given me both insight and motivation to go ahead with it. thank you! :D

I was asking about improvements to my current sense circuit a while back, maybe this thread is interesting to you: - you may be able to eliminate U17 from your design (at the cost of 1 additional opamp).
« Last Edit: March 14, 2021, 09:52:35 pm by wergor »

Offline smgvbest

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Re: DIY-SMU Project
« Reply #51 on: April 11, 2021, 03:51:12 pm »

Love the project,   following you on youtube and this thread.   Great work.
sorry to be another one of those with suggestions though

I'm curious why not go for a Teensy 4.1 Board instead of the 3.2?
The 4.1 for almost same price gives more of everything but most importantly adds a SDCARD socket on the board which would really make you ready for datalogging storage and playback.  Also supports Ethernet so you could have USB/Ethernet SCPI support which would likely save you in the future adding those options.

I of course realize what is likely the reason,   you have 3.2 boards on hand ;)
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Offline djerickson

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Re: DIY-SMU Project
« Reply #52 on: April 14, 2021, 04:27:58 pm »
You are right, I'll likely end up with a Teensy 4.x or maybe even an STM32. Currently a cohort is working on a version of the embedded code with Ethernet on a Teensy 4.x. I've designed HW for embedded systems with ethernet and RTOS, but never wrote the code myself. Also looking into changing the UI from Nextion  to LGVL.

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