Hi, Thanks for the update. Still not displaying anything but that might be down to me putting the code in the wrong place. I do have the "byte zero[8]=…" going up to 50 but omitted them for the sake of being able to post the code here.
As I previously stated, the temperature reading part of the code was from another post on this fine forum (can't remember who exactly) so all I'm trying to do is display one dot on the display for each x°C read into tC.
#include <Wire.h>
#include <binary.h>
#include <LedControl.h>
// SDA pin is Analog4
// SCL pin is Analog5
// DS1621 has A2, A1, and A0 pins connected to GND
// device ID and address
#define DEV_TYPE 0x90 >> 1 // shift required by wire.h
#define DEV_ADDR 0x00 // DS1621 address is 0
#define SLAVE_ID DEV_TYPE | DEV_ADDR
// DS1621 Registers & Commands
#define RD_TEMP 0xAA // read temperature register
#define ACCESS_TH 0xA1 // access high temperature register
#define ACCESS_TL 0xA2 // access low temperature register
#define ACCESS_CFG 0xAC // access configuration register
#define RD_CNTR 0xA8 // read counter register
#define RD_SLOPE 0xA9 // read slope register
#define START_CNV 0xEE // start temperature conversion
#define STOP_CNV 0X22 // stop temperature conversion
// DS1621 configuration bits
#define DONE B10000000 // conversion is done
#define THF B01000000 // high temp flag
#define TLF B00100000 // low temp flag
#define NVB B00010000 // non-volatile memory is busy
#define POL B00000010 // output polarity (1 = high, 0 = low)
#define ONE_SHOT B00000001 // 1 = one conversion; 0 = continuous conversion
LedControl lc=LedControl(11,13,10,1);
byte zero[8]= {B10000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000};
byte one[8]= {B11000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000};
byte two[8]= {B11100000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000};
byte three[8]= {B11100000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000};
byte four[8]= {B11110000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000};
byte five[8]= {B11111000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000};
byte six[8]= {B11111100,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000};
byte seven[8]= {B11111110,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000};
byte eight[8]= {B11111111,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000};
byte nine[8]= {B11111111,B10000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000};
byte ten[8]= {B11111111,B11000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000};
byte eleven[8]= {B11111111,B11100000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000};
void setup()
{
Wire.begin(); // connect I2C
startConversion(false); // stop if presently set to continuous
setConfig(POL | ONE_SHOT); // Tout = active high; 1-shot mode
setThresh(ACCESS_TH, 51); // high temp threshold = 80F
setThresh(ACCESS_TL, 0); // low temp threshold = 75F
Serial.begin(9600);
delay(5);
Serial.println("DS1621 Demo");
int tHthresh = getTemp(ACCESS_TH);
Serial.print("High threshold = ");
Serial.println(tHthresh);
int tLthresh = getTemp(ACCESS_TL);
Serial.print("Low threshold = ");
Serial.println(tLthresh);
lc.shutdown(0,false); // turn off power saving, enables display
lc.setIntensity(0,12); // sets brightness (0~15 possible values)
lc.clearDisplay(0); // clear screen
}
void loop()
{
int tC, tFrac;
tC = getHrTemp(); // read high-resolution temperature
if (tC < 0) {
tC = -tC; // fix for integer division
Serial.print("-"); // indicate negative
}
tFrac = tC % 100; // extract fractional part
tC /= 100; // extract whole part
Serial.print(tC);
Serial.print(".");
if (tFrac < 10)
Serial.print("0");
Serial.println(tFrac);
byte row = tC >> 3;
byte rowBits = (1 << ((tC & 7) + 1)) - 1;
for (int i=0; i<8; i++) {
if (tC < row)
lc.setRow(0, i, 0b11111111);
else if (tC > row)
lc.setRow(0, i, 0b00000000);
else
lc.setRow(0, i, rowBits);
}
}
// Set configuration register
void setConfig(byte cfg)
{
Wire.beginTransmission(SLAVE_ID);
Wire.write(ACCESS_CFG);
Wire.write(cfg);
Wire.endTransmission();
delay(15); // allow EE write time to finish
}
// Read a DS1621 register
byte getReg(byte reg)
{
Wire.beginTransmission(SLAVE_ID);
Wire.write(reg); // set register to read
Wire.endTransmission();
Wire.requestFrom(SLAVE_ID, 1);
byte regVal = Wire.read();
return regVal;
}
// Sets temperature threshold
// -- whole degrees C only
// -- works only with ACCESS_TL and ACCESS_TH
void setThresh(byte reg, int tC)
{
if (reg == ACCESS_TL || reg == ACCESS_TH) {
Wire.beginTransmission(SLAVE_ID);
Wire.write(reg); // select temperature reg
Wire.write(byte(tC)); // set threshold
Wire.write(0); // clear fractional bit
Wire.endTransmission();
delay(15);
}
}
// Start/Stop DS1621 temperature conversion
void startConversion(boolean start)
{
Wire.beginTransmission(SLAVE_ID);
if (start == true)
Wire.write(START_CNV);
else
Wire.write(STOP_CNV);
Wire.endTransmission();
}
// Reads temperature or threshold
// -- whole degrees C only
// -- works only with RD_TEMP, ACCESS_TL, and ACCESS_TH
int getTemp(byte reg)
{
int tC;
if (reg == RD_TEMP || reg == ACCESS_TL || reg == ACCESS_TH) {
byte tVal = getReg(reg);
if (tVal >= B10000000) { // negative?
tC = 0xFF00 | tVal; // extend sign bits
}
else {
tC = tVal;
}
return tC; // return threshold
}
return 0; // bad reg, return 0
}
// Read high resolution temperature
// -- returns temperature in 1/100ths degrees
// -- DS1620 must be in 1-shot mode
int getHrTemp()
{
startConversion(true); // initiate conversion
byte cfg = 0;
while (cfg < DONE) { // let it finish
cfg = getReg(ACCESS_CFG);
}
int tHR = getTemp(RD_TEMP); // get whole degrees reading
byte cRem = getReg(RD_CNTR); // get counts remaining
byte slope = getReg(RD_SLOPE); // get counts per degree
if (tHR >= 0)
tHR = (tHR * 100 - 25) + ((slope - cRem) * 100 / slope);
else {
tHR = -tHR;
tHR = (25 - tHR * 100) + ((slope - cRem) * 100 / slope);
}
return tHR;
}
