Temperature.ino

Reads the on-board LMT84 temperature sensor once a second and prints the ADC reading, the signal voltage and the temperature in °C, °F and K, using AnalogShield::TempRaw(), AnalogShield::TempMillivolts(), AnalogShield::TempCelsius(), AnalogShield::TempFahrenheit() and AnalogShield::TempKelvin().

Jumpers

JP1 at Internal (on-board U1), JP2 at Internal (RP2040 ADC), JP3 at 3.3 V.

Output

Serial Monitor at 115200 baud, for example:

Raw: 1675  1350 mV  22.4 °C  72.3 °F  295.6 K

Notes

• Change SOURCE to TempSource::SENSOR to read the sensor before the conditioning stage, or to TempSource::EXT to read the conditioned signal on A3 (move JP2 to External, the MAX11635 ADC).
• Each reading averages SAMPLES ADC reads at 12-bit resolution (10 bits on an Uno R3), which steadies the value. Every column is its own reading, so they can differ slightly.

/*
 * Temperature
 * Reads the on-board LMT84 temperature sensor once a second and prints the
 * ADC reading, the signal voltage and the temperature in °C, °F and K.
 *
 * Jumpers: JP1 at Internal (on-board U1), JP2 at Internal (RP2040 ADC), JP3 at 3.3 V.
 * Output: Serial Monitor at 115200 baud, for example
 *   Raw: 1675  1350 mV  22.4 °C  72.3 °F  295.6 K
 *
 * Change SOURCE to TempSource::SENSOR to read the sensor before the
 * conditioning stage, or to TempSource::EXT to read the conditioned signal on
 * A3 (move JP2 to External, the MAX11635 ADC).
 *
 * Each reading averages SAMPLES ADC reads at 12-bit resolution, which steadies
 * the value. Every column is its own reading, so they can differ slightly.
 */
#include <AnalogShield.h>
 
AnalogShield Shield;
 
constexpr TempSource SOURCE = TempSource::MCU;
constexpr uint8_t SAMPLES = 16;
 
void setup() {
  Serial.begin(115200);
  Shield.begin();
  Shield.SetAdcResolution(12);  // stays at 10 bits on an Uno R3
}
 
void loop() {
  Serial.print("Raw: ");
  Serial.print(Shield.TempRaw(SOURCE, SAMPLES));
  Serial.print("  ");
  Serial.print(Shield.TempMillivolts(SOURCE, SAMPLES));
  Serial.print(" mV  ");
  Serial.print(Shield.TempCelsius(SOURCE, SAMPLES), 1);
  Serial.print(" °C  ");
  Serial.print(Shield.TempFahrenheit(SOURCE, SAMPLES), 1);
  Serial.print(" °F  ");
  Serial.print(Shield.TempKelvin(SOURCE, SAMPLES), 1);
  Serial.println(" K");
 
  delay(1000);
}