If I run arduino projects in my home. Is it risk from home fire ?
How do I trust my arduino projects from home fire ?
How to design and choosing parts ? or What I should do for making my arduino projects safe from home fire ?
ps.sorry for my english.
If your home is on fire, there's a good chance that your Arduino projects will not survive.
the power source is often from your PC or a cell phone charger, or batteries.
how often has your house caught fire from your flashlight ?
or from charring your cell phone ?
or from your laptop ?
I would offer that there was a period of cell phones exploding and that you should be careful with using those batteries.
one thing not mentioned, if your house if made of gasoline, I would consider some life choices.
If an Arduino is used properly it will not go on fire.
...R
If you use lithium-ion batteries to power your projects, make sure you charge the batteries as per the manufacturers specifications.
Use approved wallwarts for those applications that require constant power.
All in all, these projects are 'no' more likely to catch fire than a transistor radio is.
When operating high voltage/current devices with relays etc., you must observe your electrical regulations.
High current low voltage projects (example: 5V at 20amp LEDs) must be properly designed.
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The Arduino itself, powered from USB or a wall-wart power supply is reasonably safe.* Heat comes from power (Power in Watts = Volts x Amps). For example, a hair dryer or toaster is often around 1200 Watts. Low voltage is much safer. The Arduino consumes a few Watts.
However, you can get high-temperature with concentrated heat... There are 25W soldering irons that can melt solder.
If nothing's getting too hot, you are probably OK. ...But something might be cool today, and something can go wrong and overheat tomorrow.
If you are switching AC power or building your own power supply, you have to be more careful. A fuse on the power line can help in case of a short or other failure that causes excess current. A fuse won't necessarily prevent a fire, but it will help.
Fire risk is project dependent. It is impossible to explain the risks unless we see schematics, bills of material and photos of your actual devices and wiring.
An Arduino, powered by a proper cell phone charger or USB is a very low risk, especially if it is a legitimate Arduino with their normal fusing. Not all clone boards are fused so this should be verified if you are concerned.
The source of heating in electrical circuits is current. The higher the current, regardless of voltage, the more potential you have for heating. You can have steady state conditions that cause overheating, these are design errors such as a wire that is too small for the current passing through it or a resistor that is undersized.
Other types of overheating are related to failures causing uncontrolled or higher than normal current flow. This results in components or wire overheating during or after the failure. This is normally where fuses can provide protection, they should cut off the excessive current before things ignite.
My projects plan.
If I want to use battery as my power source, Should I avoid using lithium ion battery ?
PoundXI:
If I want to use battery as my power source, Should I avoid using lithium ion battery ?
If you want a rechargeable battery then NiMh cells or a lead-acid battery will have a much lower fire risk than a lithium battery.
However you probably already have several devices in your home (laptops, phones) that use lithium batteries without any problem. They just need to be managed properly to ensure they are safe.
If your project does not need much energy then you might also consider using non-rechargeable AA alkaline cells for their simplicity and convenience.
...R