nau7802

Documentation

Overview

Package nau7802 implements a nau7802 sensor for load cell amplification datasheet can be found at: https://cdn.sparkfun.com/assets/e/c/8/7/6/NAU7802_Data_Sheet_V1.7.pdf example repo: https://github.com/sparkfun/SparkFun_Qwiic_Scale_NAU7802_Arduino_Library

Index

• Constants
• Variables
• type Config
  • func (config *Config) Validate(path string) ([]string, error)

Constants

const (
	NAU7802PUCTRL byte = iota
	NAU7802CTRL1
	NAU7802CTRL2
	NAU7802OCAL1B2
	NAU7802OCAL1B1
	NAU7802OCAL1B0
	NAU7802GCAL1B3
	NAU7802GCAL1B2
	NAU7802GCAL1B1
	NAU7802GCAL1B0
	NAU7802OCAL2B2
	NAU7802OCAL2B1
	NAU7802OCAL2B0
	NAU7802GCAL2B3
	NAU7802GCAL2B2
	NAU7802GCAL2B1
	NAU7802GCAL2B0
	NAU7802I2CCONTROL
	NAU7802ADCOB2
	NAU7802ADCOB1
	NAU7802ADCOB0
	NAU7802ADCREG //Shared ADC and OTP 32:24
	NAU7802OTPB1  //OTP 23:16 or 7:0?
	NAU7802OTPB0  //OTP 15:8
	NAU7802PGA
	NAU7802PGAPWR
)

Register map

const (
	NAU7802_RR    byte = iota //Register Reset              1:Reset all save RR   0:Normal Operation            (0-Default)
	NAU7802_PUD               //Power up digital circuit    1:Power up digital    0:Power down digital          (0-Default)
	NAU7802_PUA               //Power up analog circuit     1:Power up anlaog     0:Power down analog           (0-Default)
	NAU7802_PUR               //Power up ready (Read Only)  1:Power up, Ready     0:Power down, not ready       (0-Default)
	NAU7802_CS                //Cycle start ADC             1:Start ADC           0:Stop ADC                    (0-Default)
	NAU7802_CR                //Cycle ready (Read Only)     1:ADC Data Ready      0:No ADC Data                 (0-Default)
	NAU7802_OSCS              //System clock source select  1:External Crystal    0:Internal RC Oscillator      (0-Default)
	NAU7802_AVDDS             //AVDD source select          1:Internal LDO        0:AVDD Pin Input              (0-Default)
)

REG0x00:PU_CTRL Powerup Control

const (
	NAU7802_BGPCP byte = iota //Bandgap chopper              1:Disable                 0:Enable                  (0-Default)
	NAU7802_TS                //Temprature Sensor Select     1:Temprature to PGA       0:Temp disabled           (0-Default)
	NAU7802_BOPGA             //PGA bunout current source    1:2.5uA Current to PGA+   0:Current disabled        (0-Default)
	NAU7802_SI                //Short Inputs                 1:Short Inputs            0:Inputs floating         (0-Default)
	NAU7802_WPD               //Disable weak pullup          1:Disable 50K pullpup     0:Enable 50K pullup       (0-Default)
	NAU7802_SPE               //Enable strong pullup         1:Enable 1K6 pullup       0:Disable 1K6 pullup      (0-Default)
	NAU7802_FRD               //Fast ADC DATA                1:Enable REQ REG0x15[7]:1 0:Disable                 (0-Default)
	NAU7802_CRSD              //Pull SDA low on conversion   1:Enable                  0:Diable                  (0-Default)
)

REG0x11:I2C_CTRL I2C Control

const (
	NAU7802_GAINS0   byte = iota //Select gain                 1      0      1      0     1     0     1     0      (0-Default)
	NAU7802_GAINS1               //Select gain                 1 128  1 x64  0 x32  0 x16 1 x8  1 x4  0 x2  0 x1   (0-Default)
	NAU7802_GAINS2               //Select gain                 1      1      1      1     0     0     0     0      (0-Default)
	NAU7802_VLDO0                //Select LDO Voltage          1      0      1      0     1     0     1     0      (0-Default)
	NAU7802_VLDO1                //Select LDO Voltage          1 2V4  1 2V7  0 3V0  0 3V3 1 3V6 1 3V9 0 4V2 0 4V5  (0-Default)
	NAU7802_VLDO2                //Select LDO Voltage          1      1      1      1     0     0     0     0      (0-Default)
	NAU7802_DRDY_SEL             //DRDY pin fuction            1:Output clock        0:Output conv ready           (0-Default)
	NAU7802_CRP                  //Conversion Ready Polarity   1:Active Low          0:Active high                 (0-Default)
)

REG0x01:CTRL1 Control 1

const (
	NAU7802_CALMOD0 byte = iota //Calibration Selection        1:System    0:System      1:RESERVED  0: Internal   (0-Default)
	NAU7802_CALMOD1             //Calibration Selection        1:Gain Cal  1:Offset Cal  0:RESERVED  0: Offset Cal (0-Default)
	NAU7802_CALS                //Start Calibration            1:Start calibration       0:Calibration finished    (0-Default)
	NAU7802_CAL_ERR             //Calibration Error            1:Calibration failed      0:No                      (0-Default)
	NAU7802_CRS0                //Converstion Rate samp/sec    1      0      1      0     1     0     1     0      (0-Default)
	NAU7802_CRS1                //Converstion Rate samp/sec    1 320  1 N/A  0 N/A  0 N/A 1 80  1 40  0 20  0 10   (0-Default)
	NAU7802_CRS2                //Converstion Rate samp/sec    1      1      1      1     0     0     0     0      (0-Default)
	NAU7802_CHS                 //Analog input channel         1:Channel 2               0:Channel 1               (0-Default)
)

REG0x02:CTRL2 Control 2

const (
	NAU7802_SPS_10 byte = iota
	NAU7802_SPS_20
	NAU7802_SPS_40
	NAU7802_SPS_80
	NAU7802_SPS_320
)

Allowed samples per second

const (
	NAU7802_GAIN_1 byte = iota
	NAU7802_GAIN_2
	NAU7802_GAIN_4
	NAU7802_GAIN_8
	NAU7802_GAIN_16
	NAU7802_GAIN_32
	NAU7802_GAIN_64
	NAU7802_GAIN_128
)

Allowed gain levels

const (
	NAU7802_LDO_4V5 byte = iota
	NAU7802_LDO_4V2
	NAU7802_LDO_3V9
	NAU7802_LDO_3V6
	NAU7802_LDO_3V3
	NAU7802_LDO_3V0
	NAU7802_LDO_2V7
	NAU7802_LDO_2V4
)

const (
	NAU7802_CAL_SUCCESS calibrationStatus = iota
	NAU7802_CAL_IN_PROGRESS
	NAU7802_CAL_FAILURE
)

const (
	NAU7802DEVICEREV = 0x1F
)

Non-iota consts

Variables

var Model = resource.NewModel("biotinker", "sensor", "nau7802")

Model represents a nau7802 sensor model.

Types

type Config

type Config struct {
	I2CBus  string  `json:"i2c_bus"`
	I2CAddr int     `json:"i2c_addr,omitempty"`
	Gain    int     `json:"gain,omitempty"`
	Samples int     `json:"samples,omitempty"`
	Zero    int     `json:"zero,omitempty"` // raw val of what should be considered "zero"
	Kg      float64 `json:"kg,omitempty"`   // raw val of what should be considered 1 kg of weight
}

AttrConfig is used for converting config attributes.

func (*Config) Validate

func (config *Config) Validate(path string) ([]string, error)

Validate ensures all parts of the config are valid.