Problems building an HX711 scale with a Wemos D1 mini and Tasmota
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I have been trying for several days now to build a weight scale using several online guides and using for software the Tasmota HX711 integration on a D1 wemos mini V:4. My main guide is this video.
I have tried several different wirings.
Every time I change wiring I check all the wiring several times with a multimeter. I know my resistances between A- and A+ is 2 k ohms, the same as E+ and E-.
Calibration with Tasmota (sensor34 2 #ref_Weight) fails every time.
In this wiring diagram according to many articles, including instructables:
I get the following behavior on sensor reading(‘status 8’) as calibration fails:
Scale empty : HX711″:{“Weight”:0,”WeightRaw”:2722,”AbsRaw”:326727} Add 5 kg to the scale : “HX711”:{“Weight”:0,”WeightRaw”:1766,”AbsRaw”:211991}
Does anyone have any idea what I am doing wrong, or what the right wiring should be? I’ve been banging my head against a brick wall changing wires for 2 weeks now.
At some point, I don’t know how (I lost the wiring) I was getting the right weight (5kg) just reversed (when I was adding it the reading was -4980.) Then I changed A+ and A- and everything collapsed.
Here are some pictures of the actual wiring and project:
*Edit
Here are some HX711 shematics from this source:
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josepheoff.github.io
Electronics hobbyist. I torture electrons for fun, not profit.
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asked 13 hours ago
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- Pictures and a wiring diagram are not useful. You need to draw a schematic – Andy aka 13 hours ago
- Since I am using modules, isn’t the wiring diagram a schematic by itself? I can draw one in easyeda, but it will be just the wiring again. – Feronimus Sol 12 hours ago
- Schematics of the modules are needed then. And, data sheets of the sensors. – Andy aka 12 hours ago
- Ok, Thanks for responding. I added HX711 schematic. I don’t think we need one for the wemos microcontroller, as I think it will only complicate things. Wemos is only supplying voltage and communicates on port 4 and 5. – Feronimus Sol 12 hours ago
- My load cell calibration experiment might help: forums.raspberrypi.com/… – tlfong01 12 hours ago
- This might also help: aliexpress.com/i/1005002680614073.html – tlfong01 12 hours ago
- Thanks for the info, both of you. – Feronimus Sol 10 hours ago
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