# What are the two sensors doing in the automatic bread production line? [closed]

I want to know what is the name of these 2 sensors and what function they perform

Some of you were complaining about the picture quality. It is the highest quality image I can get. Also these sensors were used in a bread making factory. Link is https://youtu.be/xM7tkREK2IE. Sensor 1 at 1:11 and Sensor 2 at 5:02 . Now please answer my question.

• There's insufficient data (only blurred photographs) in your question, to give a meaningful answer. Aug 2, 2020 at 2:43
• Oh my goodness, is it a ninja level spy job interview? I would say Sensor 1 is a light sensor for the smart curtain, and Sensor 2 is an IR sensor. My answers are of course nonsense, but in order to go to second round, I need to give answesr to impress the panel that I am making brainstorming curious judgments (without cursing the stupid panel showing me blurred pictures). Of course it is the spy's job to find out more clues from blurred pictures. That is what a spy is for. :) Aug 2, 2020 at 3:51
• the clarity of the pictures is irrelevant ... the question is nonsense ... the question is similar to showing a picture of a cardboard box and asking what is inside the box Aug 2, 2020 at 3:57
• Sensor 1 is a dough ball sensor Aug 2, 2020 at 5:31
• @KaranSrivastava you said that sensor 1 is sensing dough balls, that makes it a dough ball sensor ... sensor 2 is a dough tray sensor Aug 2, 2020 at 5:37

Question

What the two sensors over there are up to? Can I know their names, Mr Ninja?

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Part A - What the two sensors are up to?

The sensors look like those cheap infrared detectors hobbyists use for obstacle avoidance toy cars (Refs 5, 6).

However, unlike the bread production line application, the obstacle toy cars to avoid usually has a smooth surface to reflective light. But in this auto bread production line appliciation, detector is not moving, but obstacle is.

In this automatic bread production line application, the bread should not reflect light that well, so the typical trick is to place a stainless plate at the back of the obstacle to reflect light. Now the obstacle (bread) passes by will absorb the light, and so stope reflection. In other words, reflection stops means another bread arrives.

1. Sensor 1

Sensor 1 blinks Green when no bread in sight. Blinks Yellow as soon as bread comes up. So I guess it is a bread detector. Of course the yellow LED can be read by another smart guy to count and record.

2. Sensor 2

In the same video, Sensor 2 is not blinking at all. I think, similar to Sensor 1 above, reflection get interrupted means bread (in this case, another tray of bread arrives.

Of course the bread detector might be sophisticated enough to also measure temperature and do data recording etc, or even fancier do something below: If the bread surface is not hot enough to stick the sesames, hold on the tray for a little bit longer, at the same time blow hot air on it, before moving on for the rain of sesames.

This is only my wild guess. After watching the videos, I have the feeling that the auto bread system is actually very low tech, and high precision position and timing is not at all required.

I would think that there is not any MCU, not to mention SBC, is used in the whole bread production plant. The CNC like digital controlled oven might only need one Celius degree and one second timing accuracy.

As can be seen in the video, the oven does not seem to have any data record/database, everything is open loop and ready reporting. In other words, no feedback control. (I once talked to a barbabe pork and roast oven chef and found that the oven is sort of a microwave oven, you can set time and temperature, but the meat temperature is measured by a thermometer. In other words, all manual controlled by the chef. He would LOL if I suggest an Arduino and Raspberry Pi IoT oven.

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Part B - What are the name of the sensors?

I guess the OP is curious to do what those sensors are for, or their "names", not model or part number. As mentioned earlier, the sensor can be hobbyist level cheapy, low precision infra red reflective sensors. I have played with them in my Arduino days. I found them friendly for newbies. Of course the OP can upgrade to ultrasound or even laser sensors with cm accuracy, but of course, as I guessed, centimetre accuracy is an over kill, toy grade accuracy is "appropriate" technology.

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Part C - Discussion, conclusion, and Recommendation

Discussion

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Conclusion

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Recommendation

As I said earlier, the cheapy US$1 IR Reflective Sensor is hobbyist friendly, educational, and great fun. I would recommend the OP and other newbies to play with it. There are many good references out there, one of which is the following: TCRT5000 IR Reflective Sensor - ProtoSupplies, US$1

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References

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Appendices

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