Today I introduce to you the Panel Volt Meter with the name V27D-2P-1.1. No wonder I did not even know what was in there in the electronics box. For me it was always a typical 7-segment display in a plastic box. Not even close.
I demonstrate the easy handling with practical examples.
On the back 2 cables are connected via JST-plug to a module, which is in a plastic box.
The first test I did with a 9V block battery: just put the cables to the poles of the battery and the display was activated with the voltage source indicator.
A 12V power supply with crocodile clips came next:
The third test with a round PowerPlug - also with 12V output voltage. If you do not know the polarity, you can just try it out: if the display does not display anything, you have confused the poles. Otherwise, the voltage of the source is displayed.
I was also a power supply for a breadboard available, so I have connected to this a 12V power supply from the last test. It offers the possibility via a jumper / switch to reduce the output voltage to 3.3V or 5V.
Anticipated: the transformation from 12V to 3.3V worked on both sides of the breadboard; the transformation to 5V on both sides not.
@Elegoo: need a new power supply for a breadboard, which converts the voltage correctly. My wears the print 545043 - check your batch. ;-)
The same composition with change of the output voltage on the breadboard with 3.3V:
When I checked the voltage, the test was used with a Particle Photon: this one spits into the WiFi, among other things with a 3.3V voltage and lo and behold: worked perfectly.
When I checked the voltage, the test was used with a Particle Photon: this one spits into the WiFi, among other things with a 3.3V voltage and lo and behold: worked perfectly.
Check your voltage before your device emits smoke!
Update 15.11.2019 - Fading LED
In the Arduino IDE under Examples - 03.Analog - Fading you can see a good application: the LED pulsates on the PWM port, which is realized by rising and falling voltage values.
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