So i removed the FS8205A and I still measure 0.7V
what I can measure now is a is -0.2V (when the battery is completely removed) coming from the 25x WS2812 LEDs when they are exposed to light.
I ran the darkness experiment and it has no impact. I do not even understand why it would matter as the battery monitor disconnects GND from Battery Minus (via the FS8205A component).
Hello all,
just got my first EasyEDA project back from JCLPCB and it’s almost as I envisioned it.
My issue is the under voltage protection. It correctly disconnects the battery but I can still measure 0.7V between Vcc and GND.
My question: how to track down this issue?
I have attached the...
Hello,
I created a project that is using a 328P to drive 24 LEDs (WS2812) which can draw 2A.
I used a guy to make a PCB layout (attached) and ordered an assembled version but something with the boost circuit is not working right. He used a LTC3872 to boost 3.7 to 5 but the circuit runs the...
Hello all,
I have an issue with the 5V input to the Arduino Nano. I noticed that when I power (using a power bank) my Nano via the USB port I get a clean ADC reading from my microphone but using the same power via the Vin pin I am getting noise. This makes me think there is a filter in the...
It is used for a charge controller. The typical 500Hz generates some audible noise and 100kHz makes the mosfets really hot so I was looking for the best alternative.
Hello all,
I would like to know what the maximum PWM frequency would be that I can drive this MOSFET:
http://www.vishay.com/docs/72439/sum110p06-07l.pdf
There are a lot of delay times given but even if I take the highest number (200ns) for 'turn-off time' this would result in 5 MHz. But this...
Correction: it looks like I am not connecting to USB GND directly
I am connected to the USB shield which has a ferrite bead (BLM18PG471SN1D) in line with it.
You are right, that seems to be the issue: If I supply the GND from my power supply to the GND of the USB connector then it's all good - but: If I tie the GND from the USB to the GND pin of the board than I am back at my wrong results. How does that make sense?
Two different GNDs?
Hello,
I am having hardware specific problems with analogRead when I am supplying power via the Vin pin on an Arduino MKR1000 (https://www.arduino.cc/en/Main/ArduinoMKR1000) — It’s an Atmel SAMD21.
Attached is a very simple voltage divider circuit that should always return a value around 2047...
Thanks for the suggestions but I am having a hard time locating the source. The sound seems to be radiating everywhere. I might have to get a tiny microphone and move that around the parts.
Is there a low end of the PWM frequency where it becomes more or less useless for regulation purpose?
Hello all,
I am using PWM in my solar charge controller and by default the frequency is 900 Hz of the micro controller?
with 900Hz you and hear the MOSFETs making noise when not full on. I tried setting the frequency to 9kHz which makes the sound not audible any more.
Is there an optimal...
This is one layer of the PCB: there are 2 thin lines directly above labels Q4 Q2 Q15 Q6 Q13
They connect the opto-coupler to the chip. The big traces are AC lines and above Q4 Q2 Q15 is a big relay.
I added now 0.1uF caps at the input of the micro controller pins connected to the opto-couplers and after running it for a few hours it does not produce false interrupts any longer.
I tried this weeks back directly at the opto-couplers but that did not have the same impact. So maybe the long...
@zappedagain: so the printout is just printing interrupts that fall outside a 16-17ms delay.
I finally got the scope functional! In the new video below I have the serial printout under the scope. The waves in the scope look perfectly fine and I have no explanation why I am getting irregular...
