Standalone Atmega328 Temp/pH/Humidity Sensor WIP

Nothing amazing, but I picked up another atmega328 chip and a resonator and built a little board. Right now it doesnt have anything hooked up but eventually it will be connected to an LCD, pH sensor, humidity sensor, temperature sensor, and some SSR's.

It has a blue LED connected to the [arduino] pin 13, an ICSP header for burning the bootloader (or incase I want the extra 2kb of space), a header for power, and a header for Tx, Rx, and RST (to program with the Arduino IDE).

Added RJ45 connector to attach sensors, and built a DS18S20 sensor board (just one for now, more to come later):

I apologize if the multiple posts makes anyone unhappy; I just like having a new post for every update, as it makes it easier for me to track progress and time/dates.

Finished the code (for now) include a Max/Min/Current temp display, using custom characters (the up and down arrows) to identify which is max and which is min, without cluttering the (tiny) display. I ran out of AWG30 wire, so when I pick more up Ill add the LCD to the atmega board and wire it up.

#include <DallasTemperature.h>
#include <LiquidCrystal.h>

// RS EN D4 D5 D6 D7
LiquidCrystal lcd(0, 1, 2, 3, 4, 5);
DallasTemperature tempSensor;
double maxtemp = 0;
double mintemp = 255;
byte up[8] = { 0x04, 0x0E, 0x15, 0x04, 0x04, 0x04, 0x04, 0x00 };
byte down[8] = { 0x04, 0x04, 0x04, 0x04, 0x15, 0x0E, 0x04, 0x00 };

void setup() 
  lcd.begin(16, 2);
  lcd.createChar(0, up);
  lcd.createChar(1, down);

void loop() 
  double temp = tempSensor.getTemperature();
  if (temp > maxtemp)
    maxtemp = temp;
  if (temp < mintemp)
    mintemp = temp;

Very cool!!!

Do u store the max, min value on the computer or in any other "thing"?