Temp sens.c - Revision history

Glenn: +cat

2008-02-10T19:10:55Z

+cat

2007-05-22T13:56:42Z

2007-05-22T13:55:53Z

2007-05-22T13:50:20Z

2007-05-22T13:49:41Z

2007-05-22T13:48:52Z

2007-05-22T13:47:56Z

2007-05-22T13:46:15Z

2007-05-22T13:42:55Z

New page

* http://ww1.microchip.com/downloads/en/devicedoc/21462c.pdf

← Older revision		Revision as of 13:56, 22 May 2007
Line 37:		Line 37:
	red=read( i2c_fd, buffer, length);		red=read( i2c_fd, buffer, length);

−	~~close( i2c_fd);~~
−
−	~~return 0;~~
−	}
−
−	~~// Read From I2c~~
−
−	~~int i2c_write (int slaveaddr, unsigned char *buffer, int length)~~
−	{
−	~~int i2c_fd;~~
−
−	~~if( (i2c_fd = open( I2C_DEVICE, O_RDWR)) < 0)~~
−	{
−	~~printf( "Unable to open the i2c port!\n");~~
−	~~return 100;~~
−	}
−
−	~~if( ioctl( i2c_fd, I2C_SLAVE, slaveaddr) == -1)~~
−	{
−	~~close( i2c_fd);~~
−	~~printf( "Unable to setup the i2c port!\n");~~
−	~~return 101;~~
−	}
−	~~write( i2c_fd, buffer, length);~~
	close( i2c_fd);		close( i2c_fd);

@@ Line 5: / Line 5: @@
 <code><pre>
 #include <stdio.h>
 #include <fcntl.h>

@@ Line 17: / Line 17: @@
 int i2c_read (int slaveaddr, unsigned char *buffer, int length)
+{
- int i2c_fd;
+	if( (i2c_fd = open( I2C_DEVICE, O_RDWR)) < 0)
- int red;
- if( (i2c_fd = open( I2C_DEVICE, O_RDWR)) < 0)
+	if( ioctl( i2c_fd, I2C_SLAVE, slaveaddr) == -1)
-−
+	{
-  printf( "Unable to open the i2c port!\n");
+		close( i2c_fd);
-  return 100;
+		printf( "Unable to setup the i2c port!\n");
+		return 101;
- if( ioctl( i2c_fd, I2C_SLAVE, slaveaddr) == -1)
-−
-  close( i2c_fd);
-  printf( "Unable to setup the i2c port!\n");
-  return 101;
-−
- red=read( i2c_fd, buffer, length);
+	red=read( i2c_fd, buffer, length);
- close( i2c_fd);
+	close( i2c_fd);
- return 0;
+	return 0;
+}

@@ Line 44: / Line 44: @@
 int i2c_write (int slaveaddr, unsigned char *buffer, int length)
+{
- int i2c_fd;
+	if( (i2c_fd = open( I2C_DEVICE, O_RDWR)) < 0)
- if( (i2c_fd = open( I2C_DEVICE, O_RDWR)) < 0)
+	if( ioctl( i2c_fd, I2C_SLAVE, slaveaddr) == -1)
-−
+	{
-  printf( "Unable to open the i2c port!\n");
+	close( i2c_fd);
-  return 100;
+		printf( "Unable to setup the i2c port!\n");
+  		return 101;
- if( ioctl( i2c_fd, I2C_SLAVE, slaveaddr) == -1)
+	write( i2c_fd, buffer, length);
-  close( i2c_fd);
+	close( i2c_fd);
-  printf( "Unable to setup the i2c port!\n");
-  return 101;
-−
- write( i2c_fd, buffer, length);
- close( i2c_fd);
- return 0;
+	return 0;
+}

@@ Line 12: / Line 12: @@
 #define I2C_DEVICE  "/dev/i2c/0"
 #define I2C_SLAVE  0x0703
 //Whats the temperature

@@ Line 17: / Line 17: @@
 void printtemp()
+{
-	char dbuff[10];
+	char dbuff[2];
 	//***TEMPERATURE

← Older revision		Revision as of 13:46, 22 May 2007
Line 1:		Line 1:
		+	Grab hold of a "Microchip TC74" temperature sensor IC, a TO220 is easy to handle, and hook it up to the bus using the pins as shown in the hardware hack section. Make sure you use a 3.3v part.
		+
	* http://ww1.microchip.com/downloads/en/devicedoc/21462c.pdf		* http://ww1.microchip.com/downloads/en/devicedoc/21462c.pdf
		+
		+
		+	<code><pre>
		+	#include <stdio.h>
		+	#include <fcntl.h>
		+	#include <sys/ioctl.h>
		+
		+
		+	#define I2C_DEVICE "/dev/i2c/0"
		+	#define I2C_SLAVE 0x0703
		+
		+	//Whats the temperature
		+
		+	void printtemp()
		+	{
		+	char dbuff[10];
		+
		+	//***TEMPERATURE
		+
		+	i2c_read (0x48, dbuff, 1);
		+
		+	printf ("Temperature :- %d degrees C\n", dbuff[0]);
		+	}
		+
		+	int main(void)
		+	{
		+	printtemp();
		+
		+	return 0;
		+
		+	}
		+
		+
		+	</pre></code>