Automatic Notification System
After a long ordeal and hard work, the entire family finally returned to the base, bringing provisions on two rovers that Althorn and his son had managed to find after the dust storm. As soon as they arrived, everyone happily ate and rested, gathering strength for the next task.
Sitting at the table, Althorn raised an important issue: “You know what we really need? It’s not just transmitting data to Earth, but receiving signals from there.”
He paused for a moment, giving the children a chance to ponder his words.
“But we’re already sending information to Earth, right?” Melia asked.
Althorn nodded: “Yes, but that’s only half the task. We can report our coordinates and the state of the base, but if we don’t receive a confirmation back, how can we be sure our messages arrived? What if Earth is trying to contact us, provide new instructions, or send a rescue mission? Without a reliable channel for receiving data, we remain in an information vacuum. It’s vital to ensure our coordinates were received correctly so they can send help with the right resources. That is why we need to set up a system to receive signals from Earth.”
Lirania nodded with a serious expression: “You’re right, dear. We must be sure we are heard, and that we can hear them.”
Everyone agreed that building an antenna was a crucial step for their survival. The family set to work, carefully discussing how to assemble an antenna from the components available to them. Althorn opened the toolbox and took out wires, metal elements, and several components from an old radio receiver they had brought from Proxima Centauri to study Earth technologies.
“We can use these wire coils and metal elements as the base for the antenna. We need something that can catch signals from long distances,” Althorn explained, pointing to the old parts.
“What if it doesn’t work?” Zorin asked anxiously.
“It will definitely work if we set the antenna length correctly and select the right frequency. The longer the antenna, the better it will pick up radio waves. We’ll try to synchronize it with the frequency range Earth’s equipment uses,” Althorn answered confidently. “The main thing is that it can catch even a faint signal. The rest is a matter of tuning.”
They began assembly, using long wires that they carefully unwound and stretched along one of the external walls of the base. Althorn attached the wire coils and connected them to the receiver system. Lirania helped tune the piezo speaker, which was to translate the received radio waves into sound. She mounted it on a platform and connected it to the power system, exercising extreme caution to avoid short circuits.
When the antenna was ready, they connected it to a small control board that converted radio waves into an electrical signal for the piezo speaker. Turning the system on, the family held their breath. A barely audible hissing sound came from the speaker. It was a signal from space – quiet and weak, but real.
However, Lirania immediately noticed a problem: “Listening to these noises is incredibly difficult. Someone would have to sit and listen to the air constantly to catch the right signal. It requires constant attention.”
Then Melia suggested a solution: “What if we add a sound sensor to the system? It will recognize signals from the piezo speaker and turn on a light at the base when something important is received. This will save us time and energy.”
Everyone approved the idea, and they moved to the next stage. Using an Arduino, a sound sensor, and an LED, they created a system that automatically reacted to changes in noise levels. The program was set so that when a certain volume threshold was reached, the sensor sent a signal to turn on the light. This made the process more automated.
For the assembly, they used an Arduino Uno, a sound sensor, and an LED. The sound sensor worked on the principle of detecting air vibrations. As soon as the noise level reached the sensitivity threshold, it sent a digital signal that turned on the LED. First, they adjusted the sensitivity threshold using the built-in potentiometer so that the LED would only light up for loud signals, ignoring background noise.
The program for controlling the light was quite simple: if the sensor detected a signal, the light turned on; upon detecting a signal again, the light turned off. With small delay settings to avoid flickering, they successfully launched the system.
After several tests, the system was operational. Now, if a message comes from Earth, the light at the base will automatically turn on, notifying them that a signal has been received. The family breathed a sigh of relief—they no longer had to worry about missing an important message from space.