Load cell Arduino HX711 Fluctuating up

by

I recently bought some extremely cheap (5 for $10.00) HX 711 boards. I noticed the same thing that you did; value drifting upward. I checked the on board load cell power supply and it seems to be defective. The band gap reference voltage (VBG) which is supposed to be 1.25 volts is actually 1.9 volts, so the on board regulator is just sending the incoming 5 volts straight to the load cell; no regulation. The 5 volts probably drifts, and the voltage drop of the pass transistor on the HX711 probably changes with temperature. All 5 boards I bought act the same way. I may get less drift if I just short the emitter to the collector on the pass transistor. I’ll try buying a “Real” board and see if it’s better.

Dan

More Related Contents:

  1. Store value in variable after HTTPREAD
  2. Convert serial.read() into a usable string using Arduino
  3. Get AT command response
  4. Why same char is not equal [closed]
  5. Arduino heart rate sensor with buzzer [closed]
  6. Wierd pointer construct
  7. How to get values and save them to use later on Arduino?
  8. GSM SM5100B C M E E R R O R : 4 error
  9. Mapping a numeric range onto another
  10. Reversible pseudo-random sequence generator
  11. Vectors in Arduino
  12. vscode “#include errors detected. Please update your includePath
  13. Serial port not working?
  14. Two semicolons inside a for-loop parentheses
  15. Convert a String to a byte array and then back to the original String
  16. SWIFT – BLE communications
  17. PHP serial port data return from Arduino
  18. Python to automatically select serial ports (for Arduino)
  19. Arduino sprintf float not formatting
  20. Serial communication between Arduino and Matlab is losing data
  21. How to unpair or delete paired bluetooth device programmatically on android?
  22. C Function to Convert float to byte array
  23. pyserial – How to read the last line sent from a serial device

Leave a Comment