When I woke up again and looked at the watch hanging on the wall, it didn't seem to be long, but I felt as if a century had passed. The thought that my brother was on his way to City D, and I couldn't stop it, made my heart bleed. I lay on the floor in a daze, not wanting to move my fingers, my mind full of bad thoughts and conjectures.

Suddenly, I thought of a person, and immediately bounced up from the ground, grabbed the phone with trembling hands in a panic, and wanted to make a phone in a hurry, but I couldn't click on that interface because I was too excited, and I was about to go crazy. finally broadcast it, and the other party quickly answered: "Nuonuo, did you see the message I gave you?" Why didn't you reply to me? ”

"Uncle...... Uncle!!! My voice was a little out of tune because of nervousness, and I slurred my words as best I could: "Yu...... Yu Luo, he went to you!! ”

"What?!" Uncle was visibly shocked, and his tone rose more exaggerated than mine, "When did this happen??? ”

I shivered and tried my best to tell him what had happened, and I felt that after so many things, my body could no longer bear it, and it was a little out of control.

"......" Uncle was silent for a while, cursed in a low voice, and said to me, "Nuonuo, I will take a good look at your brother." Don't worry, I won't let him have anything to do. Don't think too much about it, that idiot might not find his way back and run back. You're fine at home, contact me immediately if there's anything, and we'll try to keep our phones as smooth as possible, okay? ”

"Hmm...... Well!! I nodded at first, but found that he didn't seem to be able to see, so I replied to him loudly in a trembling voice, "Trouble...... Uncle. It's true...... Added to your ...... Trouble. ”

"It's okay, it's okay, why is the family so polite. Nuonuo, you don't sound good, really don't think too much, it's not as dangerous as you think, you go and rest. Relax and remember to close the door and spray your 'mom and dad' regularly. My uncle said to me worriedly on the other end of the phone. I nodded, remembering that he couldn't see it, so I quickly said "um" again, and then reluctantly hung up the phone.

After talking to my uncle on the phone, I seemed to feel a little bottomed, at least not as floating as I was just now. I took a few deep breaths and told myself to pull myself together. After calculating the time, it was still early for the next spray, and I left my parents' room.

I didn't have the appetite for lunch because I was worried about my brother, so I just took an apple and sat on the couch blankly. The thought that my brother had been sitting next to me and munching on an apple two days ago made me feel terrible - if I hadn't been so sleepy last night, and if I had sensed my brother's mind earlier, it might have been avoided. I'm not really a good sister. I stared blankly at the video screen, which seemed to be playing some news, and I wanted to watch it seriously, but I couldn't see it.

When I came back to my senses, I actually saw the advertisement again, and the woman with a weird smile was staring at me: "We are Qiwang Pharmaceutical." Our group is still recruiting volunteers, and we guarantee that all members of our volunteers' immediate family will receive the highest priority treatment and access to all the most advanced medical equipment. ”

My heart moved. I pursed my lips and began to think about something.

The "jingle bell......" alarm went off, and I was forced to wake up from my thoughts. Looking at the time, I picked up the spray and walked to Mom and Dad's room.

"Mom and Dad" are still asleep. I covered my mouth and sprayed them and left the room.

I reset my alarm. It seems that someone knocked on the door today, it must be those uncles and aunts yesterday. But because my emotions today are so unstable, I just ignored them.

But even if you notice it, you can't open the door. Somehow, I thought of my brother who had left, and my heart felt a tearing pain.

Am I just going to have to stay here like this? My brother and uncle may be in danger at this time, and I don't know anything and can't do anything about it. Is this really what I want?

I looked in the direction of Mom and Dad's room, and calculated in my mind the feasibility of a certain plan.

I went back to my room, pulled out my professional book from the hidden compartment, and found a circuit board and a rod-like thing from the sealed plastic box -- my sophomore digital circuit course design work and MCU course design work. Fortunately, I chose a single-chip microcomputer at the beginning.

I opened my laptop and quickly designed a simple schematic using AltiumDesigner, but I simulated it with Multisim without even drawing a pcb diagram due to the time constraints, and it was only after it was feasible that I started to take a look at the two things that I had pulled out of the box. The first is a simple digital timer circuit board with a digital tube, an LED light, and a 555 timer, and a numerical comparator that uses a trigger to light up the LED indicator when the set time point is reached. Of course, the settable time of the 555 timer is too short and must be remodified. I thought about it for a moment, then looked at the second one. This is a light-controlled intelligent drummer robotic arm, and a single-chip microcomputer circuit with a photoresistor is installed to control the robot's up-and-down clicking action. The microcontroller has been programmed into the corresponding musical score, and only the photoresistor needs to be connected to the power supply to maintain the sensitivity, and the robotic arm can carry out the corresponding hitting action according to the programme. Coincidentally, the beginning of the score corresponds to a relatively powerful striking action, which makes my plan likely to succeed - after all, I don't have the kind of lab box at home that I can re-write the new score program into the microcontroller.

I fixed the sleep spray with tape within a suitable distance under the movable tip of the robotic arm, first released the photoresistor, tested that the strength of the robotic arm was indeed enough to successfully press the button of the sleep spray, measured the distance of the spray from the face of "Mom and Dad" with a tool, and fixed the robotic arm on the pole of the bedside lamp with tape. In order to prevent it from falling off, I also wrapped it several times. I then pointed the photoresistor at the LED of the digital timer and sealed it tightly with black tape to make sure no extra light was coming through. Then I turned on the soldering iron that I had used since my freshman year, and when the temperature was about the same, I began to slowly pick out the solder around the 555 timer on the digital timer board. Then disassemble the electronic alarm clock, find a specific place in the alarm clock, solder the external wire, and then solder the wire back to the digital timer accordingly. Since 24 hours can't be divided by 10, I can only set three time nodes with 8-hour intervals to trigger the digital timer. I tested it a few times, revised a few small details, and finally gave up satisfied.

- In this way, every 8 hours, the sleep spray will be pressed by the robotic arm.

That way, I can leave this home with peace of mind. I smiled for the first time since today.

It took less than half an hour to pack my luggage, I fed my parents a certain amount of water, and put two pills of nutrients from my uncle into the mouths of "mom and dad", let them hold them, and left the house with the key to the house.

Locking the door of my house, I pondered my next steps. The car was driven away by my brother, and I had to find another way to get to City D.

I knocked on the door next door, and it was opened by an aunt, one of the group of people I remember in our house last night.

I politely said to her, "Hello Auntie, I'm from the other side." We met last night, right? My 'mom and dad' sent me to the city center to buy something and ask me to borrow a car from your house, I wonder if it's okay? ”

The aunt's eyes rolled and she asked me, "Why didn't your parents open the door for us today?" ”

I smiled and replied, "They seem to have found something, and they are very busy, telling us that they must concentrate today, let's not open the door yet, so as not to be accidentally distracted." They said they would come to you in person in a few days, although I don't know exactly what they found, and they wouldn't tell me. When it came to the last sentence, I deliberately pouted and put on a very aggrieved expression.

"Oh? What about your car? The aunt still didn't put the doorknob down, and although her expression was smiling, there was a hint of suspicion on her face.

"My brother was also sent to buy something, but he left first, and he drove away. Now my 'mom and dad' need another thing, so they asked me to come out and borrow a car from you to buy it. "I'm still unhurried, unhurried, and very natural.

My aunt stared at me for a while, as if to make some judgment, and finally she said, "Wait a minute." Then the door closed with a bang.

Less than a minute later, she reopened the door and handed out a bunch of car keys: "The big jeep parked in the parking lot directly across from the gate is that." ”

I took the car keys, smiled and thanked them, and turned to walk downstairs to the parking lot.

I gave myself two days. After two days, if it doesn't work, no matter what the outcome, you must come back. Even with this simple facility, I can't guarantee that nothing will go wrong. Mom and Dad, after all, still have someone by their side to guard them. I stopped downstairs, looked back deeply in the direction of my home, and turned to leave.