I wish to build a drive system to measure its efficiency. Hopefully I can isolate its efficiency and then model it as an exponential function of
output torque. I do not wish to bore you with the details of the mechanical drive train that i wish to build this is just for an introduction to the following details.
I need a bit of help for setting up the Voltage Sensor portion to my contraption. Here are my current toughs to the hardware for capturing the data.
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Use of three ‘S’ Load Cells see: https://www.robotshop.com/en/catalogsearch/result/?q=s+type+load+cell&order=relevance&dir=desc
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For the amplification and analog conversion, the use of three HX711 Load Amplifiers: https://www.robotshop.com/ca/en/hx711-load-cell-amplifier.html
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The computing portion: an ESP32 similar to this: https://www.robotshop.com/ca/en/sparkfun-thing-plus-esp32-wroom.html. Leveraging the Wifi capability of the ESP32 to ship the data to a Linux instance.
What I am less familiar with is the capability of the ESP32 to supply the three HX711 and load cells with stable voltage and current for the operation.
Here are my thoughts:
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Use the 3.3 volt output from the ESP32 to supply the VDD of the HX711 from what I understand this is the digital supply voltage for
the HX711. -
Use the 5 volt VIN input for the ESP32 as an output to the VCC analog inputs of the three HX711 i.e. Load cells.
My assumption to the above configuration is I am hoping that this is the proper way to proceed to get better results where the voltage from the analog feed to the HX711 would not be affected by the VDD inputs.
Any input to the topic is welcomed. Thank You.