Hello!
I am searching for tutorials how to build temperature reading with arduino what is shows on led matrix. But so far searching without result.
Maybe someone can help me!
If you want help here, you will need to reveal exactly what temperature sensor you are trying to use (and likewise what display).
I want use LM35 temp. sensor and show it on 8x8*(red)* CA Led Matrix
I tried these 2 tutorials
and it work perfect, now i want to get reading on led matrix (but no idea how)
there is my arduino board:
Or are you asking for help getting the numbers from the LM35 to the display?
Yes!
I have made a scrolling text form this code:
/*
* Show messages on an 8x8 led matrix (cathode rows),
* scrolling from right to left.
*
* Pinouts & code
* see http://arduino.pastebin.com/f35fdf323
* see http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1203747843/13#13
*/
// pin[xx] on led matrix connected to nn on Arduino (-1 is dummy to make array start at pos 1)
int pins[17]= {-1, 5, 4, 3, 2, 14, 15, 16, 17, 8, 9, 10, 11, 12, 13, 6, 7};
// (for some reason I ended up with different pinouts that Andrew's)
// col[xx] of leds = pin yy on led matrix
int cols[8] = {pins[13], pins[3], pins[4], pins[10], pins[06], pins[11], pins[15], pins[16]};
// row[xx] of leds = pin yy on led matrix
int rows[8] = {pins[9], pins[14], pins[8], pins[12], pins[1], pins[7], pins[2], pins[5]};
// Letter definitions based on 5 bit-wise columns (5 x 7 font)
#define SP {0, 0, 0, 0, 0}
#define EX {0, 125, 0, 0, 0} // !
#define A {31, 36, 68, 36, 31}
#define B {127, 73, 73, 73, 54}
#define C {62, 65, 65, 65, 34}
#define D {127, 65, 65, 34, 28}
#define E {127, 73, 73, 65, 65}
#define F {127, 72, 72, 72, 64}
#define G {62, 65, 65, 69, 38}
#define H {127, 8, 8, 8, 127}
#define I {0, 65, 127, 65, 0}
#define J {2, 1, 1, 1, 126}
#define K {127, 8, 20, 34, 65}
#define L {127, 1, 1, 1, 1}
#define M {127, 32, 16, 32, 127}
#define N {127, 32, 16, 8, 127}
#define O {62, 65, 65, 65, 62}
#define P {127, 72, 72, 72, 48}
#define Q {62, 65, 69, 66, 61}
#define R {127, 72, 76, 74, 49}
#define S {50, 73, 73, 73, 38}
#define T {64, 64, 127, 64, 64}
#define U {126, 1, 1, 1, 126}
#define V {124, 2, 1, 2, 124}
#define W {126, 1, 6, 1, 126}
#define X {99, 20, 8, 20, 99}
#define Y {96, 16, 15, 16, 96}
#define Z {67, 69, 73, 81, 97}
int dispSpeed = 6; // Constrols scroll speed (1 minimum, way too fast)
byte bit[8] = {128, 64, 32, 16, 8, 4, 2, 1}; // Used for bit comparisons
byte colVals[8] = {0, 0, 0, 0, 0, 0, 0, 0}; // Hold display columns (initaly blank)
// Define display string here
const int charNum = 6; // Number of letters in display string
byte string[charNum][5] = {O,P,V,SP,SP,SP};
void setup() {
Serial.begin(9600); // for troubleshooting
for (int i = 1; i <= 16; i++) { // sets the pins as output
pinMode(pins[i], OUTPUT); }
for (int col = 0; col < 8; col++) { // set up cols and rows
digitalWrite(cols[col], HIGH); }
for (int row = 1; row < 8; row++) {
digitalWrite(rows[row], HIGH);
}
Serial.println(availableMemory()); // 670 bytes for charNum = 15
}
void loop() {
for (int ltr = 0; ltr < charNum; ltr++){// For each letter in string array
for (int y = 0; y < 6; y++){ // For each columin in letter + one space
shiftLeft(); // shifts display columns left
if (y < 5){
colVals[7] = string[ltr][y]; } // add new letter column on right
else {colVals[7] = 0; } // or empty space between
for (int x = 0; x < dispSpeed; x++){// loop to refresh display x times ton control scrolling
display();
}
}
}
}
void shiftLeft(){
for (int x = 0; x < 7; x++){
colVals[x] = colVals[x + 1];
}
}
void display() {
for (int col = 0; col < 8; col++){
for (int row = 0; row < 8; row++){
if (colVals[col] & bit[row]){
digitalWrite(rows[row], HIGH);}
}
digitalWrite(cols[col], LOW); // Turn on column
delay(1); // Delay for POV
for (int row = 0; row < 8; row++){
digitalWrite(rows[row], LOW);
}
digitalWrite(cols[col], HIGH); // And off
}
}
// this function will return the number of bytes currently free in RAM
// written by David A. Mellis
// based on code by Rob Faludi http://www.faludi.com
int availableMemory() {
int size = 1024;
byte *buf;
while ((buf = (byte *) malloc(--size)) == NULL);
free(buf);
return size;
}
connected pins:
// pin[xx] on led matrix connected to nn on Arduino (-1 is dummy to make array start at pos 1)
int pins[17]= {-1, 5, 4, 3, 2, 14, 15, 16, 17, 8, 9, 10, 11, 12, 13, 6, 7};
There is arduino code:
/*
An open-source LM35DZ Temperature Sensor for Arduino. This project will be enhanced on a regular basis
(cc) by Daniel Spillere Andrade , http://www.danielandrade.net
http://creativecommons.org/license/cc-gpl
*/
int pin = 4; // analog pin
int tempc = 0,tempf=0; // temperature variables
int samples[8]; // variables to make a better precision
int i;
void setup()
{
Serial.begin(9600); // start serial communication
}
void loop()
{
for(i = 0;i<=7;i++){ // gets 8 samples of temperature
samples[i] = ( 5.0 * analogRead(pin) * 100.0) / 1024.0;
tempc = tempc + samples[i];
delay(1000);
}
tempc = tempc/8.0; // better precision
Serial.print(tempc,DEC);
Serial.println(" Celsius");
tempc = 0;
delay(1000); // delay before loop
}
In Serial Monitor can check temperature value