1:58 AM
2 hours later…
3:53 AM
3 hours later…
6:45 AM
(1) HX711 Forum Discussion Notes 1/4
https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=227137&hilit=hx711+tlfong01#p1393160
(2) HX711 Forum Discussion Notes 1/4
https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=227137&hilit=hx711+tlfong01#p1395349
(3) HX711 Forum Discussion Notes 1/4
https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=227137&hilit=hx711+tlfong01&start=25#p1395658
1kg = 3.2mV
(4) HX711 Forum Discussion Notes 1/4 (calibration Notes)
https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=227137&hilit=hx711+tlfong01&start=25#p1395939
https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=227137&hilit=hx711+tlfong01#p1393160
(2) HX711 Forum Discussion Notes 1/4
https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=227137&hilit=hx711+tlfong01#p1395349
(3) HX711 Forum Discussion Notes 1/4
https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=227137&hilit=hx711+tlfong01&start=25#p1395658
1kg = 3.2mV
(4) HX711 Forum Discussion Notes 1/4 (calibration Notes)
https://www.raspberrypi.org/forums/viewtopic.php?f=37&t=227137&hilit=hx711+tlfong01&start=25#p1395939
Either Vcc = 3V3 or 5V0. The voltage output for max loading, either 500g or 5kg, is about 5mV. In other words, the HX711 load cell amplifier should be set to the following:
2 hours later…
9:08 AM
Now I have connected the 500g load cell bridge output (wht, grn) wires to HX711, and ready to use the PiPy hx711 load cell amplifier library function to amplify a couple of mV to a couple of Volts.
One thing I forgot to mention is that: (1) What is an "airfoil"? (2) I googled and know it is just the "wing" of an aeroplane. (2) But how can the wing lift the plane? So I googled the following Youtube: How Does A Wing Actually Work? 2012aug03, 1,224,732 views
https://www.youtube.com/watch?v=aFO4PBolwFg. See you later.
https://www.youtube.com/watch?v=aFO4PBolwFg. See you later.
3 hours later…
11:55 AM
airfoil is more like mimicking a wing or "flying object". Anyway the whole experimetn is rather a disaster and tomorrow I'll be taking everything apart, enough.
Too many mistakes and wrong choices were made. My tests are completely useless. I also have 5kg load cells and they barely register any force. So ideally they should have been more 1 or 2kg cells but worse the rod used is made of brass which way too soft meaning before any force is send to the load cell the brass rod will nullify it by bending plus the fan we use is waaay too weak.
3 hours later…
2:38 PM
(1) About load cell spec - Just now I used a 12V 0.7A CPU fan to blow my 500g load cell (5mV full scale), and found there was not any noticeable different in DMM reading. I at once gave up trying any bigger fans. I guess you need a 100g load cell to do your experiments. My 500g load cell is from this dirt cheap weight scale:
AliExpress Mini Digital Weight Scale 100g ~500g, 0.01g ~ 0.1g - US1 ~ US$4
https://pt.aliexpress.com/item/4001156466931.html?spm=a2g0o.productlist.0.0.da7a51f8VgCWtF&algo_pvid=658b725e-1413-4d98-858b-cb71bb29f1e8&algo_expid=658b725e-1413-4d98-858b-cb71bb29f1e8-8&btsid=0b0a556316038953125082096ed2d7&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603
https://pt.aliexpress.com/item/4001156466931.html?spm=a2g0o.productlist.0.0.da7a51f8VgCWtF&algo_pvid=658b725e-1413-4d98-858b-cb71bb29f1e8&algo_expid=658b725e-1413-4d98-858b-cb71bb29f1e8-8&btsid=0b0a556316038953125082096ed2d7&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603
(2) Falling back to Arduino - I very much agree you return to Arduino, because Rpi python has too steep a learning curve for you now. You remind me two years back, I over ambiguously thought I could learn ESP8266 and LUA quickly. But I did not know that LUA is event driven and perhaps easy for GUI design.
But very surprisingly it took me more than 100 hours to learn the IDE and another 10 hours just to blink a LED. For Arduino it took me less than 30 minutes to read the example and blink a LED. My conclusion was that I did not have the prerequisite knowledge to do NodeMCU LUA event driven programming.
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Oct27
Oct '2028
Oct29
Discussion between tlfong01 and Cem
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