One of the great things about the Raspberry Pi is the community that works to create really great projects. I have setup a Raspberry Pi B looking out my windows. It faces the front door so can see anyone coming down the street and toward the door. I had a couple cheap $2 webcams lying around so I set them up looking out the windows. The total cost of the entire setup is about $10, minus the cost of the Pi itself, I also think that the Pi is a little underpowered for the task as occasionally the thing will stop working after several weeks, the camera still records the video, but the web-interface has to be reloaded in order to get the thing working again.
Overall, I’d say that this project was ineffective for its purpose because unfortunately, the cameras would not record movement accurately enough, and sometimes would record several hours of minimal movement. An IP camera would likely be more cost-effective and better suited for the task, the Pi I used was simply underpowered to monitor two webcams and crashed after about 2 weeks of working continuously. Viewing the files showed that although it captured movement and video, some were corrupt, glitch or only captured about 3 usable frames. It did, however, show a good live view of what was going on outside the house, with about a 4-second delay.
Overall I would say that a Raspberry Pi as a webcam security camera on the cheap is not a good idea, the main contributing factor being that it was not able to keep the program running and often would save garbage to the SD card. If I were to do this again I would not use two for definite as it simply did not work effectively enough to actually increase security, It would often record trees moving for hours and sometimes one camera would freeze up entirely.
Just In Time is a lean production technique, It involves ordering a product right as it is about to run out, but before the business has to stop manufacture, this allows a business to work effectively when creating a product that requires a lot of parts and accessories.
|Raw Materials||Work in Progress||Finished Goods|
| Bought from suppliers
Supplier may not be able to meet demand Supplier could not raise prices Used in assembly or as ingredients
Parts for assembly|| Not Sellable
Costs business money to make into product May be a slow process
Wine May cost staff hours if long time delays i.e. building houses|| Needs moving for social events
This table shows the disadvantages of holding stock at different levels of the stock control process.
Why hold stock?
- Fundamentally holding stock allows production to take place
- To satisfy customer demand
- As a precaution against delays from suppliers
- It allows efficient production
- It allows for seasonal changes
- It provides buffer between production process
Main influences on Stock
- The need to satisfy demand such as demand influxes or lower commodity prices.
The a need to manage working capital, stock control for example could mean a product is depleted without being replaced.
Risk of losing value, such as the stock market price. Food and vegetables such as flowers may also decrease in value over time.
Low stock levels
- Lower stock holding posts.
- Lower risk of obsolescence.
- Less capital tied up in stock. So the business is more liquid.
- Consistent with operating on lean production.
High stock levels
- Production is always fully supplied so there are never any delays as the product never runs out.
- Potential for lower costs by ordering in larger quantities.
- The business is better able to handle unexpected changes in demand or the need for higher output as they will have the stocks available.