MICRO Project 2024

It is required to control the temperature of a bakery electric oven using a simple low cost solution based on a microcontroller. At the start of the operation, the operator enters a preset hot-air temperature for the proper operation of the oven together with a defined baking time. The oven temperature control design is based on sampling the hot air temperature at three (3) different locations on constant intervals. Based on these readings, the system starts heating the inlet air by operating a fan and up-to three (3) heating elements positioned in-front-of the fan. The number of engaged heating elements depends on the difference in the actual air temperature inside the oven and the preset temperature entered by the user. In case of over heat, the system starts aerating the compartment by reversing the direction of the fan to suck hot air to the outside of the oven and disengages the heating elements. The ventilation of the closed backing compartment is mandatory before opening the oven door after the completion of the pre-described baking cycle. A safety must be included not to open the oven door during baking cycle. The total operation is displayed on an LCD indicating different operations: heating, cooling, ventilating, baking, end of baking, time, temperature, etc... The final product includes a keypad matrix for data entry, an LCD for system parameters display, 3 temperature sensors, a fan (DC motor), door safety locking system and heating elements (can be simulated with 3 LEDs). Acoustic signal (Buzz) for end-of-operation warning should be added.