HX711 - AVIA

HX711 Frequently Asked Questions (FAQs)

• What is the recommended power-on sequence for the HX711?
  The recommended power-on sequence is to apply VCC first, followed by AVDD, and then finally AVSS. This ensures that the internal analog circuitry is properly biased before the digital circuitry is powered on.
• How do I handle the HX711's analog output when the input voltage is close to the power supply rails?
  When the input voltage is close to the power supply rails, the HX711's analog output may saturate or clip. To handle this, you can use an external voltage limiter or clamp circuit to prevent the input voltage from exceeding the power supply rails.
• What is the purpose of the HX711's internal oscillator, and can I use an external clock source instead?
  The internal oscillator is used to generate the clock signal for the HX711's analog-to-digital converter (ADC). While it is possible to use an external clock source, it is not recommended as it may affect the ADC's performance and accuracy. The internal oscillator is optimized for the HX711's ADC and provides the best performance.
• How do I calibrate the HX711 for accurate weight measurements?
  To calibrate the HX711, you need to perform a two-point calibration: one at zero load and one at a known load. This involves applying a known weight to the load cell and adjusting the HX711's gain and offset registers to match the expected output. You may also need to perform temperature compensation and adjust for non-linearity errors.
• What is the maximum sampling rate of the HX711, and how does it affect the measurement accuracy?
  The maximum sampling rate of the HX711 is 80 Hz. The sampling rate affects the measurement accuracy, as higher sampling rates can reduce the noise and increase the resolution of the measurement. However, increasing the sampling rate also increases the power consumption and may affect the ADC's performance.