Building a USB powered PIR/Radar adaptor for LED strings.
This is a module that allows standard PIR and radar body-detector modules to be used with a standard USB power supply to switch a string of parallel LEDs (or just one higher powered one).
Note that some small modules don't have the output in the middle and will need hooked up with three individual wires. (You can also do that with the other modules if you want more positioning options.)
I used a 2-pin USB connector that in hindsight could have been mounted as a through hole component with the securing tabs also being soldered. It makes it easy to hook up to a USB power bank or plug-in supply. The power bank will need to be the type that puts out a steady 5V all the time without pulsing it or going into a sleep mode.
The PIR modules have a very low standby current and will run for a very long time in standby, but the doppler radar units draw a bit more current for their RF oscillator and a power bank will not last as long between charges in standby. (But still a long time.)
You can connect the common battery operated parallel strings of LEDs to these units, but if the ones with chasing effects are used only every second LED may light due to alternate LED polarities.
The choice of output resistors will affect the LED intensity and run time. The two 10 ohm resistors suggested will give about 100mA which is the maximum recommended for the BC547 transistor.
100mA is good for fairly long strings at good intensity, with good power bank run time.
The doppler unit can see through plastic for outdoor use, but will also pick up ambient foliage movement.
The Giaco maker knife website:- https://giaco.com/
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
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This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.
Видео Building a USB powered PIR/Radar adaptor for LED strings. канала bigclivedotcom
Note that some small modules don't have the output in the middle and will need hooked up with three individual wires. (You can also do that with the other modules if you want more positioning options.)
I used a 2-pin USB connector that in hindsight could have been mounted as a through hole component with the securing tabs also being soldered. It makes it easy to hook up to a USB power bank or plug-in supply. The power bank will need to be the type that puts out a steady 5V all the time without pulsing it or going into a sleep mode.
The PIR modules have a very low standby current and will run for a very long time in standby, but the doppler radar units draw a bit more current for their RF oscillator and a power bank will not last as long between charges in standby. (But still a long time.)
You can connect the common battery operated parallel strings of LEDs to these units, but if the ones with chasing effects are used only every second LED may light due to alternate LED polarities.
The choice of output resistors will affect the LED intensity and run time. The two 10 ohm resistors suggested will give about 100mA which is the maximum recommended for the BC547 transistor.
100mA is good for fairly long strings at good intensity, with good power bank run time.
The doppler unit can see through plastic for outdoor use, but will also pick up ambient foliage movement.
The Giaco maker knife website:- https://giaco.com/
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
http://www.bigclive.com/coffee.htm
This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.
Видео Building a USB powered PIR/Radar adaptor for LED strings. канала bigclivedotcom
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