The timer uses different formula for meat, chicken or egg, but also has a separate timer that can be activated manually.
Meat cooking time formula:
1 pounds - 35 min
2 pounds - 45 min
Every extra pound add 15 min
*500f for 15 min. buzzer bips once. than 380f for the rest of the cooking.
Chicken cooking time formula:
1 pounds - 40 min
2 pounds - 60 min
Every extra pound add 10 min
*400f for the whole time. ignor buzzer bip after 15 first min.
Egg cooking time formula:
Soft egg - 5 min
Hard egg - 11 min
Step 1: Materials
switch - radio shack
back lit LCD display - parallax.com
Universal Solderless Breadboard
6 * 470 Kohms resistors (red, black, orange, gold)
1 * 2 Kohms resistors (red, black, red, gold)
2 * .1ÃÂµF capacitors
1 * voltage regulator (7805)
Microchip microcontroller - pic16F819- digikey.com
pic data sheet
If you don't have a pic programer or the Compiler and you want to purchase them. i recommend these from Melabs:
Step 2: Board & Circuit
i draw the circuit itself.