ACME Fireplace Company hired me to make a new design for the gas powered fireplace with a cut off valve. They had a problem with their old design of the fireplace would randomly shut down because the cutoff valve would pickup humidity and pressure. The solution I came up with makes the fire not turn off if one of the thermal sensors are off, instead all of them need to be off. I was also told to include a sensor that would contact the people if not all four of the sensors are on or off.
Up: Circuit concept
Left: Truth table, K-Mapping, and expressions
Down: Completed Circuit (done in Multisim)
The project was made with the intention that the fireplace would work properly while taking out humidity and air pressure out of the equation. The current design will be a temporary one until we make a better designed one that could possibly do its job better. The way we designed the new model is that if one or more of the thermal sensors are not working, the sensor will send a message to our customer support so the fireplace can be safe for the customer. To avoid the air pressure and humidity problem, the only way the fireplace will turn off is that if more than one thermal sensor becomes negative. This will prevent one thermal sensor being the cause of random shut downs because of air pressure or humidity issues. Unlike the past design where if one thermal sensor is off, then the entire thing turns off. The way we made the circuits is with NAND and NOR connectors. This allowed us to spend less money on parts and make the product lighter. This will make the product able to be made and released in large quantities so we do not have to worry about the inability to make more products to keep up with demand. We hope this design will be good enough until our next product with the fireplace. The pricing will be announced soon and it is something that we cannot come up with because we are not the team to do that. Anyways, have a nice day to anyone reading this.