How to Automate a Haunted House Using Sensors

You've built a creepy haunted house and it's the scariest one around. How do you take it to the next level? Automate it using non-contact infrared photoelectric sensors to control electronic scare devices.

Haunted houses are designed to be very creepy and with enough volunteers, they may be loaded with frights around every corner. What if there are not enough volunteers available to haunt the house? Infrared photoelectric sensors are the perfect device to detect guests and to trigger electronic gadgets, such as noise makers or motorized animatronic characters, giving visitors a scare they won't soon forget.

Sensors are used every day in various industries ranging from food processing to automotive assembly lines. Some of the top commercial haunted houses in the country are now using the very same sensors to automate their haunted attractions, providing a far creepier presentation. Industrial sensors are available to the general public for less money than you might expect, giving the average Joe an opportunity to built a haunted house that rivals even the ones presented by major theme parks.

The easiest type of photoelectric sensor to use in a haunted house attraction is one that uses a mechanical relay switch. This type of sensor is as easy to wire and operate as a light switch. Also be sure that the photoelectric sensors use infrared light and do not display a visible light which would draw attention to them. Arrange the photoelectric sensors across from each other in a hallway or door jamb, or anywhere that a guest will pass between them. The guest will break the infrared beam of light, causing the mechanical relay switch in the photoelectric controller to close, which will provide power to a noise maker or animatronic device. Each time a guest passes the sensors, the same action will occur repeatedly without operator intervention. This allows volunteers in the haunted house to spend time mingling with the guests and not hiding behind walls, just making noise.

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How to Measure the Level of Material in a Large Bin or Hopper

Let's say you have a large bin or hopper and you regularly fill it with wood chips or powder or even liquid. How can you accurately measure the level in the bin?  In applications where it is necessary to measure the level of material in a large collection bin, there is not always an obvious way. This article will describe one method, using an ultrasonic sensor.

Purchase an industrial ultrasonic sensor (uses sound waves) with a range long enough to bounce from the top of the bin down to the lowest possible level of the material, or at least the lowest level that you care to measure. Be sure to select an ultrasonic sensor with an analog output.  Be aware that all ultrasonic sensors have a "blind zone" beginning at the face of the sensor and extending to various distances away. For this reason, the material to be measured should never be allowed to enter this "blind zone" because accurate measurement cannot take place in this range.  Also note that ultrasonic sensors are affected by drastic changes in temperature and may need to be re-calibrated occasionally.

Install the ultrasonic sensor in the top of the bin pointing downward so that it faces the material in the bin. The analog output from the sensor will need to interface with the PLC or computer so that the reading may be interpreted and any necessary functions may take place when the level reaches certain points.

Empty the bin and take note of the output from the sensor. Then, fill the bin to the maximum desired level and take another reading from the sensor. Now you have your high and low margins. You can program certain things to happen when the material hits a certain level, for instance, when the level of water in a bin reaches the top, the pump that supplies the water shuts off until the water is lowered again to another predetermined level.

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How to Use Sensors to Detect that Contents are Missing from Foil Wrappers

An application to detect if the contents of a foil wrapper are missing is fairly easy to solve using two sets of industrial grade high-powered infrared photoelectric sensors.

Many industries use foil wrappers to package products. For quality control, it is a good idea to have a system capable of automatically detecting when the contents of those wrappers are missing. Some companies use human beings to manually pick and choose wrappers, which is tedious, and not very efficient. There is a solution that really works; infrared photoelectric sensors.

Position one set of infrared photoelectric sensors in a through-beam configuration, so that the foil wrapper will move between the sensors at a given point. Adjust the sensitivity of the infrared photoelectric sensors so that they will detect the foil wrapper whether it is full or empty. The sensors should be at their most sensitive setting for this. The output from this set of sensors will report to the PLC to let it know when a foil wrapper is present.

Position the second set of infrared photoelectric sensors beside the first set, also in a through-beam configuration and facing the same direction. Be sure that the sensors are set to different frequencies to avoid cross-talk between the two sets. This set of sensors should be adjusted to its least sensitive setting. In other words, crank the gain setting to the max. Assuming that the photoelectric sensors being used are industrial grade, they should be able to see through an empty wrapper easily, but not one containing product. This set should also report to the PLC.

Now, you have two infrared beams of light striking the foil wrapper as it passed. One is used as a reference to let the PLC know when a foil wrapper is present. The second set of sensors lets the PLC know when a foil wrapper is missing its expected contents. This system is very reliable and is in use at a number of companies worldwide.


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How to Detect Visitors in a Driveway Using Infrared Photoelectric Sensors

Infrared photoelectric sensors may be used to detect objects in a number of ways. Mounting the sender and the receiver across from each other is known as a through-beam configuration and provides the strongest beam. Retro-reflective mounting places the sender and the receiver on the same side and bounces the infrared beam off an object when it is in close enough proximity.  Diffuse proximity mounting uses the same layout as retro reflective, but also uses a reflector on the side opposite the photo eyes. Any of these three configurations may be used to set up a driveway monitoring system depending on what type of structures are adjacent to the driveway.

Evaluate the best location to mount the sensors. This may be a mailbox, a fence post, a brick building, a bridge, or whatever standing structure happens to be within range of the driveway. If you mount the photoelectric sensors in a through-beam configuration they do not need to be very close to the driveway, whereas the other two options will need to be much closer, depending on the type of photoelectric sensors used, like ten to fifteen feet.

Trace a route back to your home for burying the sensor wires, but don't put the wires in the ground yet. Instead, extend the wires back to the house above-the-ground and connect the photo eyes to the appropriate power source or to an external amplifier if the photoelectric system includes one. Connect the output of the sensors to a buzzer or bell with a noise that is distinctly different from the sound that your doorbell or telephone makes so that you can easily distinguish them. Many photoelectric amplifiers include a relay output, so connecting them to a buzzer should be as easy as connecting a mechanical switch. See the manufacturer's website for wiring diagrams.

Test the system using different types of cars and trucks and also people. Adjust the sensitivity of the photoelectric system to the optimum level and mount the photo eyes at the right height from the ground to hit the midsection of most vehicles. When everything is set correctly, bury the conduit containing the wires and do your best to conceal the photo eyes from view. This system will provide a reliable means for detecting guests before they are standing on your doorstep and could also be interfaced with a security camera or lights. The opportunities are unlimited.

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How to Detect Boats in a Log Flume Ride

It’s time for yearly maintenance and you need a reliable solution to replace the sensors in your log flume attraction. Try industrial infrared photoelectric sensors to keep your log flume running trouble-free year round.

Purchase an industrial infrared photoelectric system. Check the ratings on the photo eyes and be sure they have an IP67 rating or better. Also check their range to be sure it is more than adequate to cover the entire distance across the river. If the photo eyes need to operate underwater, choose the most powerful combination of transmitter and receiver available.

Mount the photo eyes in a through-beam configuration for the best performance. Do not rely on reflectors because they will cause problems as they get dirty. If the photo eyes will spend any length of time underwater, it is a good idea to purchase the hard-wired cable version instead of a quick-disconnect type. If you do use quick-disconnect sensors, be sure to squirt dielectric grease into the connectors before attaching them together. This will help keep the connections dry and the pins free from corrosion.

Ask the manufacturer or distributor of photoelectric sensors for a demo set to test in your ride application before you buy. Try several sets from different companies side-by-side to determine which ones work the best. Follow a strict maintenance schedule and replace the photo eyes at least once a year. Your visitors will appreciate the extended ride uptime that quality sensors provide.

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