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'set_gain' returns the last value of 'read' #55

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'set_gain' returns the last value of 'read' #55

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5 changes: 3 additions & 2 deletions HX711.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,7 @@ bool HX711::is_ready() {
return digitalRead(DOUT) == LOW;
}

void HX711::set_gain(byte gain) {
long HX711::set_gain(byte gain) {
switch (gain) {
case 128: // channel A, gain factor 128
GAIN = 1;
Expand All @@ -39,7 +39,8 @@ void HX711::set_gain(byte gain) {
}

digitalWrite(PD_SCK, LOW);
read();
// read one more value with old gain/channel to update settings
return read();
}

long HX711::read() {
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4 changes: 2 additions & 2 deletions HX711.h
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Original file line number Diff line number Diff line change
Expand Up @@ -34,10 +34,10 @@ class HX711
// input PD_SCK should be low. When DOUT goes to low, it indicates data is ready for retrieval.
bool is_ready();

// set the gain factor; takes effect only after a call to read()
// set the gain factor; read() is invoked to set the new gain and its return value is returned
// channel A can be set for a 128 or 64 gain; channel B has a fixed 32 gain
// depending on the parameter, the channel is also set to either A or B
void set_gain(byte gain = 128);
long set_gain(byte gain = 128);

// waits for the chip to be ready and returns a reading
long read();
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