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Modified Barometric Pressure Sensor to make it easier for beginners to understand.

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This commit is contained in:
Tom Igoe
2010-08-15 13:32:38 +00:00
parent aab8563d1e
commit d58ea9b378
1 changed files with 103 additions and 102 deletions
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53
libraries/SPI/examples/BarometricPressureSensor/BarometricPressureSensor.pde
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@ -1,36 +1,35 @@
/*
SCP1000 Barometric Pressure Sensor Display
Shows the output of a Barometric Pressure Sensor on a
Uses the SPI library. For details on the sensor, see:
http://www.sparkfun.com/commerce/product_info.php?products_id=8161
http://www.vti.fi/en/support/obsolete_products/pressure_sensors/
Shows the output of a Barometric Pressure Sensor on a
Uses the SPI library. For details on the sensor, see:
http://www.sparkfun.com/commerce/product_info.php?products_id=8161
http://www.vti.fi/en/support/obsolete_products/pressure_sensors/
This sketch adapted from Nathan Seidle's SCP1000 example for PIC:
http://www.sparkfun.com/datasheets/Sensors/SCP1000-Testing.zip
This sketch adapted from Nathan Seidle's SCP1000 example for PIC:
http://www.sparkfun.com/datasheets/Sensors/SCP1000-Testing.zip
Circuit:
SCP1000 sensor attached to pins 6, 7, 10 - 13:
DRDY: pin 6
CSB: pin 7
MOSI: pin 11
MISO: pin 12
SCK: pin 13
Circuit:
SCP1000 sensor attached to pins 6, 7, 10 - 13:
DRDY: pin 6
CSB: pin 7
MOSI: pin 11
MISO: pin 12
SCK: pin 13
created 31 July 2010
modified 14 August 2010
by Tom Igoe
*/
created 31 July 2010
modified 14 August 2010
by Tom Igoe
*/
// the sensor communicates using SPI, so include the library:
#include <SPI.h>
//Sensor's memory register addresses:
const int PRESSURE = 0x1F; // 3 most significant bits of pressure
const int PRESSURE_LSB = 0x20; // 16 least significant bits of pressure
const int TEMPERATURE = 0x21; // 16 bit temperature reading
cont byte READ = 0b11111100; // SCP1000's read command
const int PRESSURE = 0x1F; //3 most significant bits of pressure
const int PRESSURE_LSB = 0x20; //16 least significant bits of pressure
const int TEMPERATURE = 0x21; //16 bit temperature reading
const byte READ = 0b11111100; // SCP1000's read command
const byte WRITE = 0b00000010; // SCP1000's write command
// pins used for the connection with the sensor
@ -89,13 +88,14 @@ void loop() {
unsigned int readRegister(byte thisRegister, int bytesToRead ) {
byte inByte = 0; // incoming byte from the SPI
unsigned int result = 0; // result to return
Serial.print(thisRegister, BIN);
Serial.print("\t");
// SCP1000 expects the register name in the upper 6 bits
// of the byte. So shift the bits left by two bits:
thisRegister = thisRegister << 2;
// now combine the address and the command into one byte
dataToSend = thisRegister & READ;
byte dataToSend = thisRegister & READ;
Serial.println(thisRegister, BIN);
// take the chip select low to select the device:
digitalWrite(chipSelectPin, LOW);
// send the device the register you want to read:
@ -129,7 +129,7 @@ void writeRegister(byte thisRegister, byte thisValue) {
// of the byte. So shift the bits left by two bits:
thisRegister = thisRegister << 2;
// now combine the register address and the command into one byte:
dataToSend = thisRegister | WRITE;
byte dataToSend = thisRegister | WRITE;
// take the chip select low to select the device:
digitalWrite(chipSelectPin, LOW);
@ -140,3 +140,4 @@ void writeRegister(byte thisRegister, byte thisValue) {
// take the chip select high to de-select:
digitalWrite(chipSelectPin, HIGH);
}