230V power supply to Arduino
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Nice, thanks...
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Was looking into the same and ordered 2 different 230/110v to 5v of ebay to get a cheap 5v powersource. Just got them today.
The White around $1.5 and the Black was $1.0
Before wirering everything up, I just added the smaller white's pcb to the black case incl. radio and pro mini. And there is room for a bit more.
So unless it goes up in flames I will try to create a default sensor node. -
If you don`t go over 50-60% of the amps that that charger can output, there will be no problems. I suggest you replace the capacitor on the 5V area with a bigger one and change the 220/110v capacitor with a higher quality one. What I figure from your pictures is that the black charger doesn't have a bridge rectifier.. It's safer for you to use one. (Don't forget about the fuse)
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Anyone tested one of these cheap power supplies with an osciloscope?
I got a couple yesterday but not sure if they are good enough
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Was looking into the same and ordered 2 different 230/110v to 5v of ebay to get a cheap 5v powersource. Just got them today.
The White around $1.5 and the Black was $1.0
Before wirering everything up, I just added the smaller white's pcb to the black case incl. radio and pro mini. And there is room for a bit more.
So unless it goes up in flames I will try to create a default sensor node.@Magiske I am using a power supply similar to the black one. My one has a fake optocoupler. The output voltage is unregulated. Have a close look before using this pcb. ;)
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May be too big or too expansive... but it is for sure a good (and safe...) product with a 33x22 mm footprint..
http://www.mouser.com/ProductDetail/RECOM-Power/RAC01-33SC/?qs=waQl70lBfV2Z5QQrs%2FIAaw%3D%3D
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Does it fit on 2.54 mm prototype boards?
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Yes it does.
Look data sheet http://www.mouser.com/ds/2/468/RAC01_02-SC-16262.pdf -
I've got a couple of them (3.3 and 5 V models), the wired models. Just received. Still to test...
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you can disassemble some components like transformer and cap. So you can make your own mysensors design and you get very small and cheap transformer. I can't find cheaper I think. or maybe on alibaba!
I have these http://fr.aliexpress.com/item/AC-220V-DC-3V-10V-5V-9V-1w-1x1w-2w-2x1w-3w-3x1w-Constant-Current-Constant/1900256299.html?recommendVersion=1 -
you can disassemble some components like transformer and cap. So you can make your own mysensors design and you get very small and cheap transformer. I can't find cheaper I think. or maybe on alibaba!
I have these http://fr.aliexpress.com/item/AC-220V-DC-3V-10V-5V-9V-1w-1x1w-2w-2x1w-3w-3x1w-Constant-Current-Constant/1900256299.html?recommendVersion=1@scalz said:
you can disassemble some components like transformer and cap. So you can make your own mysensors design and you get very small and cheap transformer. I can't find cheaper I think. or maybe on alibaba!
I have these http://fr.aliexpress.com/item/AC-220V-DC-3V-10V-5V-9V-1w-1x1w-2w-2x1w-3w-3x1w-Constant-Current-Constant/1900256299.html?recommendVersion=1Can this convert 230v to 5v and supply enough power for say an pro mini with motion sensor?
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@scalz these are constant current. how come they supply constant voltage?
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@Moshe Livne: when I tested it, it was with atmel standalone. So I added a voltage regulator. And you can add a little filter if you want..
@scalz Oh I see. Thanks!
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you can disassemble some components like transformer and cap. So you can make your own mysensors design and you get very small and cheap transformer. I can't find cheaper I think. or maybe on alibaba!
I have these http://fr.aliexpress.com/item/AC-220V-DC-3V-10V-5V-9V-1w-1x1w-2w-2x1w-3w-3x1w-Constant-Current-Constant/1900256299.html?recommendVersion=1@scalz said:
I'm using similar one, it is also called 3 x1 W Led driver and by my measurements provides 300mA and 17V without load
I use 220uF to filter its output and I use 78L05 to regulate down to 5V. This can give up to 5V@40mA output. The restriction is a heating desipation rating for 78L05.
For higher loads I would recomment to use DC stepdown. With DC stepdown you can get up to 5V@650mA with 80% efficiency -
@tbowmo said:
What is the efficiency of these "cheap" mains -> 12V/5V converters?
they are quite efficient. 5V version can deliver 400mA while unloaded supply consumes only 0.2W
Also, it means that you need a second regulator (be that a linear, or a switching) from 12/5V -> 3.3V.
output voltage is defined by output resistor divider. I have an experience on changing 12V output to 5V by replacing a single SMD resistor. Theoretically the same way you can get 3.3V directly from the supply.
If you KNOW what you are doing, you could use SR036 from supertex, that can deliver 3.3V directly from mains (non isolated output).
it could probably be used for mysensor connected dimers / light switches on mains. (something where human interface is not needed).
that is true. I have the experience with SR036 (SR037 provides 5V output) and can say that you will never find smaller supply. But the output current will not exceed 50mA and this will depends on your mosfet output capability. Such a supply consumes about 1W while unloaded. Etc. not that green from the power consumption. This is my one side SR037 supply:
if you know what you are doing it is also other choice - linkswitch chips LNK302/304/306. The last one can deliver up to 350mA not isolated power directly 5V or 3.3V. It is as efficient as isolated - unloaded it will consume about 0.2W. A bit bigger than SR036. Easy to construct because you do not need custom transformers. For example Duwi zwave wall switches are using this type of the supply. This is my one side SMD version with regulated output:
next one is a classical low frequency transformer. The smallest here http://www.hahn-trafo.com/english/pcb-transformers-bv20.php - BV 201 0128 is ideal to power low power arduino device. It will consume unloaded about 1W. Can deliver about 60mA with linear regulator or about 100mA back regulated at 3.3V output. This one is my light controlling arduino using BV 201 0128:
and the last one is capacitive supply. Most chinice cheap devices are using this type, most cheap supply:
@axillent said:
if you know what you are doing it is also other choice - linkswitch chips LNK302/304/306. The last one can deliver up to 350mA not isolated power directly 5V or 3.3V. It is as efficient as isolated - unloaded it will consume about 0.2W. A bit bigger than SR036. Easy to construct because you do not need custom transformers. For example Duwi zwave wall switches are using this type of the supply. This is my one side SMD version with regulated output:
Hello axillent, I just bought some of those LNK306 and would like to make a test board, could you share your schematic or components you used to make your own?
Thanks a lot.
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@axillent said:
if you know what you are doing it is also other choice - linkswitch chips LNK302/304/306. The last one can deliver up to 350mA not isolated power directly 5V or 3.3V. It is as efficient as isolated - unloaded it will consume about 0.2W. A bit bigger than SR036. Easy to construct because you do not need custom transformers. For example Duwi zwave wall switches are using this type of the supply. This is my one side SMD version with regulated output:
Hello axillent, I just bought some of those LNK306 and would like to make a test board, could you share your schematic or components you used to make your own?
Thanks a lot.
@themoloch sure
I'm using a standard schematic from the datasheet. It is also a separate application note exists with recommendation on how to optimize input filter for low loads. The board on the picture for example uses 2x1uF + 2x1uF + 1mH as input filter
