hx711

Reading from an hx711 24-Bit ADC on a Raspberry Pi in Golang

This is based off https://github.com/rajmaniar/hx711 it extends the implementation by adding the ability to tare and calibrate the device. It's non-opinionated about the units that you are converting e.g. grams, pounds etc.

The HX711Attributes struct is introduced to handle keeping track of known device attribute data.

Both the tare and calibration use the median of the numberOfReadings retrieved because there are situations where a reading from the load cell can be a large spike which could throw off an average.

To tare the device you can use Tare(numberOfReadings int). To calibrate the device you can use Calibrate(numberOfReadings int, knownWeight float64).

Example:

import "github.com/rajmaniar/hx711"

func main() {
    
    clock := "gpio23"
    data := "gpio24"
    
    // existing attributes are known
    attributes := &HX711.Attributes{Tare: 1000, CalibratedReading: 2000, CalibratedWeight: 1500}
    
    h,err := hx711.NewWithKnownAttributes(data, clock)
    
    if err != nil {
        fmt.Printf("Error: %v",err)
    }
    
    for err == nil {
        var data int32
    
        // returns the reading based on the calibration attributes
        data, err = h.ReadCalibratedData()
        fmt.Printf("Read from HX711: %v\n",data)
        time.Sleep(250 * time.Millisecond)
    }
    fmt.Printf("Stopped reading because of: %v\n",err)
}

NB

• h.Reset() will reset the chip
• h.Gain is set to hx711.GAIN_A_128 by default