Hi all aroud, I’ m up to give the ‘Load Cell as endstop’ approach a try. I figured out that Klipper already supports this concept and already offers to configure that. My choice went to the ADS1220 since i want to use it for probing. [image] <a href="https://www.ti.com/lit/ds/symlink/ads1220.pdf?ts=1726485365773&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252Fde-de%252FADS1220%253Fbm-verify%253DAAQAAAAJ_____zt7fGWRPRzIRdM9-IRrMkwsQbQuP29Wg00h-pTCB7abKqALtZP-DViS-c7wTkIOp7Mjp3eFqRUOXolgPfUleP2MLOGpYyoaduQpUptWEi9awjg2KtDT9vIkI5-_kw76eVPbSq-ZJBfdkgZYeFjTxZH77OE9WWwvldlfgQnGPfIM6V21w2rmxcg5UYvUVZ9_3alnd8U_P-BpJl96HXnNhh_4luZ2Dykm8ZZgL61hrXLVP7zscVssL7gH7d8umry3gC0oqRMAOLNhztJVrLrWnzB4fInRnXS7zwgdt0YcDcxTci_xJ6h-fruyD_M" rel="noopener nofollow ugc">Datasheet ADS1220 Since i already have an ADXL345 res…

Its designed around the 4 wire bridges. We haven’t seen a any cheap load cells that tolerate more than 5V. I’m sure they do exist but this community tends to settle for whatever is cheapest. The Chinese market is awash in 5V, 1mV/V load cells. [image] limefrog: I just found a bunch of document…

[image] limefrog: I’ m up to give the ‘Load Cell as endstop’ approach a try. I figured out that Klipper already supports this concept and already offers to configure that. My choice went to the ADS1220 since i want to use it for probing. [image] Strain Gauge/Load Cell based Endstops Fair w…

Thanks, i’ m already reading that topic, but seems i’ ve not proceeded far enough. Have not seen the ADS1220 mentioned so far. @hcet14 May you help about the wiring? I’ ve read the reference Voltage can be choosen higher, maybe 24V. That might lower the noise level? What about a huge capacitor f…

@garethky is working on a Klipper board for the ADS1220 integration here: ADS1220-Klipper-Board/KiCad at mainline · garethky/ADS1220-Klipper-Board · GitHub Unfortunately it is a lot more than just stuffing a big cap into it and also the reference voltage cannot be increased at whim. 7V is max for t…

[image] limefrog: @hcet14 May you help about the wiring? No, I would suggest the board Sineos mentioned, sorry. You may contact @garethky I guess he will support allies using his board and giving the “strain gauge load cell based” approach a go. In my eyes, this is the future for endstops an…

[image] Sineos: the reference voltage cannot be increased at whim No, for sure not. But please have a look at this document provided by TI , in section 6.3. The Document is a guide to Bridge Measurements and discusses the Topic in general, so not particularly for the ADS1220 - but i wonder if…

@tinyfluffs might also want to chime in here! We are in the phase of trying to find out what works with the ADS1220. I have already written code for it and I’ll be announcing a new testing branch that’s on the way to klipper mainline. So we have software. But hardware… We have a number of challeng…

Hi Gareth, Thank you for stepping in here. [image] garethky: So we have software. That is, what i have seen and why i started to tinker with the ADS1220. [image] limefrog: My plan is to use it with four load cells in Wheatstone-bridge configuration. According to chapter 9.2.3 of the ab…

[image] garethky: I primarily intend to target the under-bed sensors you are interested in. Just to throw that in: I want to put the strain gauges on the printhead … so i’ d prefer a tiny board design. Maybe having the ADXL onboard might be an option to the final design?

Thanks a lot. I’ll try to get some things running [image] garethky: load cells that tolerate more than 5V Acknowledged, now i understand where the bottleneck is… … but if we have two of those cheap load cells in a row and the expected shift in this voltage divider is about a fraction of one…

That looks quite tiny! Unfortunately that doesn’t fit with my current concept due to the circumstance that i needn’t the strain-gauges integrated. Edit: One moment - i 'm going wrong here, don’t i? The BWGR pins went out to the bridge? I’ll take the opportunity to show off whats is in my mind, b…

Using ADS1220 with Load Cells in Wheatstone-Bridge

General Discussion

hcet14 September 16, 2024, 3:10pm 2

…you may read further on…

Good luck, hcet14

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Using ADS1220 with Load Cells in Wheatstone-Bridge

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