I have talked to some friends about the night light I made myself. If I don’t make my own friends, according to this tutorial, I can have a human body infrared night light for about 10 yuan.
Material preparation:
1HC-SR501, human body infrared sensor module, 3.6-4.88
2 photosensitive resistor 1.2 yuan ten or twenty (buy upstairs shop to buy) 5516 on the line, the appearance of dark resistance 10k, enough
3TP4056 2.26 one
4AO3400/AO3402 (upstairs to buy a store to buy) or other nmos (very important, because the infrared module effectively outputs a high level, with the pmos high-end driver plus a triode, trouble), the charging treasure on the 8205 is better 10 About two dollars.
5 light strips 1.4 (mainly used to remove the lamp beads, I just bought yesterday, 1 meter 60 5050) Remember to buy warm white, because the domestic white, the blue component is too strong, not good for the retina
Approximately 3.6+2.26+1.2+1.4≈10 yuan
Plus:
Solder wire,
wire,
Old mobile phone battery / (dry battery, rechargeable battery), etc.
(ps: I bought a dozen mobile phone batteries in the mobile phone repair point regardless of the size of the good or bad.... The following demonstration is one of the pieces, the mobile phone battery comes with a protective board, you do not need to buy a protective board)
Power calculation:
Domestic BISS0001 5V under 100uA, 3V 50uA, count 100uA (about 30uA for imported, about 10uA for normal)
Light 5050 20mA, 8 160mA, in order to protect the lamp beads, the maximum should not exceed 150mA, of course, it is too bright, change the current limiting resistor
So a 1000mAH mobile phone lithium battery = 6 hours of light plus 1000 hours of standby (41 days)
That is, the lighting time is 8~9 minutes every day, and it takes one and a half months (there is basically a toilet in one night, enough)
Battery capacity analysis: Alkaline No. 5 dry battery generally has a capacity of about 1800mAH, requiring 3 sections in series, and 4.5V to 3V.
Lithium battery self-discharge is small, nickel-hydrogen is large (slightly monthly self-discharge can reach 20%~30%), you should consider what battery to use, anyway, I don’t know how to use dozens of large and small lithium batteries. Come to dry ( ̄ _ ̄|||)
Remember, do not use the voltage regulator module, the power consumption of the voltage regulator chip is still quite large, the domestic 7805 has some mA,
The 7133 manual that comes with the module says that it is a few uA, but it is generally used in a domestic cottage, which consumes at least 10 times more power, which is considered to be a super power consumer.
I think someone will mention what charging power supply, this is extremely inefficient and wasteful power supply (do it yourself), it is better to get a charging head and drag it.
Probable material list: battery photoresistor 5516 infrared module and light bar
First, look at the module, remove the diode and voltage regulator module on the upper right side of the module, and solder the photoresistor in the two holes close to the pin header.
Solder the mos tube on the hole plate, low-end drive
The circuit diagram is too lazy to draw, will nmos do the switch anyone?
Pull out the light bar and use double-sided tape on the board
Complete as follows:
All led parallel, stacking tin routing skills: 300 degrees to each pad on the tin, then 200 degrees to stick these tin beads, it is easy
I don't use a current limiting resistor, because the domestic ao3400 has a Vgs of about 3.5V, Vds is about 1V, and the highest voltage of the lithium battery is 4.2.
The whole lamp is about 3.2V, which is almost the limit, so the problem is not big, and the overcurrent is the most light, I am led more, feel free.
Someone may notice a very thin copper wire, which is over-current protected, equivalent to a fuse, providing protection of approximately 2A when the battery protection board fails (essentially impossible).
Ok, look at the brightness, you can, slightly glaring, after all, point light source
Welding on the charging module, I did not have 4056, using the charging treasure integrated board, see my phone line to complete this, in order to add a cover
Cover the mask and look at it again, pay attention to the white balance of the phone and the photo exposure is according to the light.
This white balance and exposure according to the table lamp, you can see that it is warm white light, the brightness can be used at night.
Over, very simple, do not need to make your own board. After turning off the lights at night, as long as people walk around, the effective range is 120° and the fan shape is about 6 meters. The average person's house is enough, and the cost of 10 yuan is also very cheap.
The module provides two potentiometers, one is to adjust the sensitivity, the other is to adjust the lighting time, from about 3 seconds to several minutes, each person adjusts as needed
Jump cap is to choose continuous trigger and non-continuous trigger, the default is OK
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