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Updates for dual channel support #22

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Merged
merged 1 commit into from
Sep 16, 2025
Merged

Updates for dual channel support #22

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24 changes: 17 additions & 7 deletions Adafruit_NAU7802.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -87,13 +87,6 @@ bool Adafruit_NAU7802::begin(TwoWire *theWire) {
if (!ldomode.write(0))
return false;

// PGA stabilizer cap on output
Adafruit_I2CRegister pwr_reg = Adafruit_I2CRegister(i2c_dev, NAU7802_POWER);
Adafruit_I2CRegisterBits capen =
Adafruit_I2CRegisterBits(&pwr_reg, 1, 7); // # bits, bit_shift
if (!capen.write(1))
return false;

return true;
}

Expand Down Expand Up @@ -327,6 +320,23 @@ NAU7802_SampleRate Adafruit_NAU7802::getRate(void) {
return (NAU7802_SampleRate)rate_select.read();
}

/**************************************************************************/
/*!
@brief Enable or disable optional PGA filters. NOTE - this should only
be used for single channel operation.
@param enable Use true to enable or false to disable.
@returns False if any I2C error occured
*/
/**************************************************************************/
bool Adafruit_NAU7802::setPGACap(bool enable) {
Adafruit_I2CRegister pwr_reg = Adafruit_I2CRegister(i2c_dev, NAU7802_POWER);
Adafruit_I2CRegisterBits capen =
Adafruit_I2CRegisterBits(&pwr_reg, 1, 7); // # bits, bit_shift
if (!capen.write(enable ? 1 : 0))
return false;
return true;
}

/**************************************************************************/
/*!
@brief Perform the internal calibration procedure
Expand Down
1 change: 1 addition & 0 deletions Adafruit_NAU7802.h
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Original file line number Diff line number Diff line change
Expand Up @@ -92,6 +92,7 @@ class Adafruit_NAU7802 {
NAU7802_Gain getGain(void);
bool setRate(NAU7802_SampleRate gain);
NAU7802_SampleRate getRate(void);
bool setPGACap(bool enable);
bool calibrate(NAU7802_Calibration mode);

private:
Expand Down
91 changes: 91 additions & 0 deletions examples/nau7802_dual_channel/nau7802_dual_channel.ino
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Original file line number Diff line number Diff line change
@@ -0,0 +1,91 @@
#include <Adafruit_NAU7802.h>

Adafruit_NAU7802 nau;

void setup() {
Serial.begin(115200);
Serial.println("NAU7802");
if (! nau.begin()) {
Serial.println("Failed to find NAU7802");
while (1) delay(10); // Don't proceed.
}
Serial.println("Found NAU7802");

nau.setLDO(NAU7802_3V0);
Serial.print("LDO voltage set to ");
switch (nau.getLDO()) {
case NAU7802_4V5: Serial.println("4.5V"); break;
case NAU7802_4V2: Serial.println("4.2V"); break;
case NAU7802_3V9: Serial.println("3.9V"); break;
case NAU7802_3V6: Serial.println("3.6V"); break;
case NAU7802_3V3: Serial.println("3.3V"); break;
case NAU7802_3V0: Serial.println("3.0V"); break;
case NAU7802_2V7: Serial.println("2.7V"); break;
case NAU7802_2V4: Serial.println("2.4V"); break;
case NAU7802_EXTERNAL: Serial.println("External"); break;
}

nau.setGain(NAU7802_GAIN_128);
Serial.print("Gain set to ");
switch (nau.getGain()) {
case NAU7802_GAIN_1: Serial.println("1x"); break;
case NAU7802_GAIN_2: Serial.println("2x"); break;
case NAU7802_GAIN_4: Serial.println("4x"); break;
case NAU7802_GAIN_8: Serial.println("8x"); break;
case NAU7802_GAIN_16: Serial.println("16x"); break;
case NAU7802_GAIN_32: Serial.println("32x"); break;
case NAU7802_GAIN_64: Serial.println("64x"); break;
case NAU7802_GAIN_128: Serial.println("128x"); break;
}

nau.setRate(NAU7802_RATE_320SPS);
Serial.print("Conversion rate set to ");
switch (nau.getRate()) {
case NAU7802_RATE_10SPS: Serial.println("10 SPS"); break;
case NAU7802_RATE_20SPS: Serial.println("20 SPS"); break;
case NAU7802_RATE_40SPS: Serial.println("40 SPS"); break;
case NAU7802_RATE_80SPS: Serial.println("80 SPS"); break;
case NAU7802_RATE_320SPS: Serial.println("320 SPS"); break;
}
}

void loop() {
int32_t chan0, chan1;

//--------------
// CHAN 0
//--------------
// Switch channel
nau.setChannel(0);
// Take 10 readings to flush out readings
for (uint8_t i=0; i<10; i++) {
while (! nau.available()) delay(1);
nau.read();
}
// Take actual reading
while (! nau.available()) {
delay(1);
}
chan0 = nau.read();

//--------------
// CHAN 1
//--------------
// Switch channel
nau.setChannel(1);
// Take 10 readings to flush out readings
for (uint8_t i=0; i<10; i++) {
while (! nau.available()) delay(1);
nau.read();
}
// Take actual reading
while (! nau.available()) {
delay(1);
}
chan1 = nau.read();

//--------------
// results
//--------------
Serial.print(chan0); Serial.print(","); Serial.println(chan1);
}
68 changes: 68 additions & 0 deletions examples/nau7802_single_channel/nau7802_single_channel.ino
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Original file line number Diff line number Diff line change
@@ -0,0 +1,68 @@
#include <Adafruit_NAU7802.h>

Adafruit_NAU7802 nau;

void setup() {
Serial.begin(115200);
Serial.println("NAU7802");
if (! nau.begin()) {
Serial.println("Failed to find NAU7802");
while (1) delay(10); // Don't proceed.
}
Serial.println("Found NAU7802");

nau.setLDO(NAU7802_3V0);
Serial.print("LDO voltage set to ");
switch (nau.getLDO()) {
case NAU7802_4V5: Serial.println("4.5V"); break;
case NAU7802_4V2: Serial.println("4.2V"); break;
case NAU7802_3V9: Serial.println("3.9V"); break;
case NAU7802_3V6: Serial.println("3.6V"); break;
case NAU7802_3V3: Serial.println("3.3V"); break;
case NAU7802_3V0: Serial.println("3.0V"); break;
case NAU7802_2V7: Serial.println("2.7V"); break;
case NAU7802_2V4: Serial.println("2.4V"); break;
case NAU7802_EXTERNAL: Serial.println("External"); break;
}

nau.setGain(NAU7802_GAIN_128);
Serial.print("Gain set to ");
switch (nau.getGain()) {
case NAU7802_GAIN_1: Serial.println("1x"); break;
case NAU7802_GAIN_2: Serial.println("2x"); break;
case NAU7802_GAIN_4: Serial.println("4x"); break;
case NAU7802_GAIN_8: Serial.println("8x"); break;
case NAU7802_GAIN_16: Serial.println("16x"); break;
case NAU7802_GAIN_32: Serial.println("32x"); break;
case NAU7802_GAIN_64: Serial.println("64x"); break;
case NAU7802_GAIN_128: Serial.println("128x"); break;
}

nau.setRate(NAU7802_RATE_10SPS);
Serial.print("Conversion rate set to ");
switch (nau.getRate()) {
case NAU7802_RATE_10SPS: Serial.println("10 SPS"); break;
case NAU7802_RATE_20SPS: Serial.println("20 SPS"); break;
case NAU7802_RATE_40SPS: Serial.println("40 SPS"); break;
case NAU7802_RATE_80SPS: Serial.println("80 SPS"); break;
case NAU7802_RATE_320SPS: Serial.println("320 SPS"); break;
}

// Take 10 readings to flush out readings
for (uint8_t i=0; i<10; i++) {
while (! nau.available()) delay(1);
nau.read();
}

// SINGLE CHANNEL ONLY!!!
// enable use of PGA stabilizer caps (Cfilter) on VIN2
nau.setPGACap(true);
}

void loop() {
while (! nau.available()) {
delay(1);
}
int32_t val = nau.read();
Serial.print("Read "); Serial.println(val);
}