HX711 MicroPython Driver for ESP32

This project provides a MicroPython driver and usage example for the HX711 load cell amplifier connected to an ESP32. It supports reading from one or more load cells with basic tare and scale calibration.

📦 Features

• Raw and averaged readings
• Tare (zeroing)
• Scale factor calibration
• Multi-sensor support
• Compatible with ESP32 running MicroPython

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🔌 Wiring Diagram

Load Cell (4-wire) → HX711 module

Green   (A+)  ─────────────▶  E+ (Signal +)  
Red     (E+)  ─────────────▶  E- (Excitation +)  
White   (A-)  ─────────────▶  A- (Signal -)  
Black   (E-)  ─────────────▶  A+ (Excitation -)

HX711 should be connected to the ESP32 using GPIO pins for DOUT and PD_SCK.

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📲 Example: Reading from 1 Load Cells

from hx711 import HX711
import utime

hx1 = HX711(5, 4)

# Perform tare (zero)
hx1.tare()
    
# Set arbitrary scale factor (to be calibrated)
hx1.set_scale(1000)
print("Setup done!")

print("Running...")
while True:
    t = utime.ticks_ms()
    while utime.ticks_diff(utime.ticks_ms(), t) < 500:
        print(hx1.instant_read())

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🛠️ Calibration

You must calibrate each sensor individually using a known weight:

1. Call .tare() with no load.
2. Place a known weight on the load cell.
3. Adjust .set_scale(scale) until the reading matches the known weight.

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📋 Requirements

• ESP32 with MicroPython firmware
• HX711 modules
• Load cells (4-wire)
• Proper 5V → 3.3V logic level conversion if necessary

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📄 License

GNU General Public License v3.0