💬 Easy/Newbie PCB for MySensors

[Łukasz Rybak]

Hi,
I've received boards from dirtypcb, it looks pretty good! Very nice design!

Just have a few questions:

1. May I use 78L33 voltage regulator instead of LE33ACZ?
2. Do you know what is the RAW input tollerance of Pro Mini 3.3V (ebay one, not genuine one)?
   I'm thinking of attach temperature sensor to my PIRs in my home and feed it parasitically from PIR (~13VDC). Do you think is it possible?

[sundberg84]

Hi Lukasz!

1. 78L33 is a 3.3v regulator so yes, but is different pins depending on which version you have so you need to check where you put the pins. From left Vout, Gnd and Vin should be connected to the PCB. Compare it with LE33 pinouts.

2. In theory it should be 12v BUT its a fact that manu clones cant handle that. I would not go above 9v.

[Łukasz Rybak]

@sundberg84

1. Ok I will check pinouts
2. I understand. So what is the best way in your opinion to feed node parasitically in safe manner? Use voltage regulator to step down voltage to safe 3.3v? Should I expect any significant heat? I'm aware of heat becouse it can trigger false alarm of my PIR

[sundberg84]

I would go with a voltage regulator from your 13v to 5 or 3.3v depending on which arduino you buy. I would connect this to PWR on the pcb and avoid using arduino internal voltage regulator (avoid use of two voltage regulators).

[Łukasz Rybak]

Thanks sundberg84, I will give a try.
One last question. I didn't find any note in BOM list. May I use ceramic caps instead of electrolitic ones?
I 'm not able to find electrolitic 0.1uF caps at my local store.

[sundberg84]

Yes, you can replace it with a ceramic. There are alot to read about the differences on the net.

[Dombo71]

Ger..
Like to order your stuff...
Only what are the specs of all your Resistor and Capacitor..
Or perhaps you can make the bom complete..

Cannot wait...

[sundberg84]

@Dombo71 - Hi!
The BOM is complete, all capacitors needed and its values are found in the BOM tab.
Since caps are so cheap and common i wont specify any link since you can find theme anywhere.

[lxz]

Anyone from the Netherlands who ordered a pack of the rev.8 boards? How long did it take to be delivered?
The status update on dirtypcbs.com says Shipped on 27 Jan 2016 and I can't wait until I receive them! :)

[AWI]

@lxz I can take around 2 months... ;-(, but in most cases within 5 weeks after shipping.

[DutchMurk]

By heart it took about 10-12 days. "maar pin me er niet op vast"

[GertSanders]

@lxz Chinese New Year Holiday is just over, there seems to be quite a backlog for items ordered in january. It depends on some luck, to Antwerpen took around 6 weeks.

[lxz]

Thanks for the replies, guess I have to wait some more then :)

[gentrfam]

I love this PCB. It makes things so much easier. I am having a little problem with the battery version though. I think I've got it wired up right. I've got the jumper. I've got the booster. But, when I plug in a battery (I've tried a 3.7 volt battery, outputting 3.3v - the one from the solar weather station project, and 2 or 4 AA batteries), I get a "Radio Init Fail" message in the serial monitor. Also, the LED at the back, the one near the reset button, does not light brightly. It initially flashes brightly, then nothing.

I've wired it up two different times for the battery setup, and with neither am I getting the live radio.

I am able to get a good radio with the 5v setup.

[sundberg84]

Hi!
@gentrfam
It looks correctly wired. The radio (when bat jumper is selected) is feed directly from the battery, so you need to keep within the specs of the radio (0,9v- 3.6v).
First thing I would do is measure volt over radio. Also measure volt over the arduino. Working backwards can give you a clue where it fails if its a power problem.

My wild guess is that either its not a genuine/working NRF radio, or you have a cold/bad solder point on arduino and/or radio.

I always check my radio before soldering them... a while back I counted that I have ordered 33 radios from Ebay and 3 of them was broken so far. So i have a Easy board just for radiocheck loaded with timeaware sketch.

[gentrfam]

@sundberg84 Thank you. I checked, and out of the solar-powered battery, I'm actually just out of the radio spec - 3.7-4.0v. I'm going to try with a new radio, and a smaller battery to see if I fried this radio.

In the meantime, I tried to run the battery through an LE33 regulator on a breadboard. (Eventually, I'd like to run the solar-battery through the measuring circuitry on the PCB.) Any idea why the LE33 would be outputting 0.6v?

Thanks for your help. I'm afraid I'm a complete and total noob on this.

[sundberg84]

No, check incoming voltage to the LE33 - is this correct?
Is the caps oriented (ground) correcly? (if you have any).
Broken?

[fisher]

Hi,
I already received PCB, soldered everything and I'm stuck with reliable radio quality. It works good only when I keep touching antenna on nrf board with my finger. Once I release my finger I've got st=fail.
I've soldered two boards already, tried with two different radios and have same results
I use nrf24L01+ with internal antenna and 5v pro mini, voltage regulator and caps (100nF, 10uF and 4,7uF) as well.

Do you have any ideas what can be wrong?

[barduino]

I can't wait to get mine, I bet on version 8 :smile: .Fear {display:none;} despite being a noob with electronics.

Although I do have a question, for a 5v pro mini...

Suppose I power this using a 9v battery, assuming connection to the RAW, that means not BAT or REG jumpers ?

And I also wont be able to use the voltage divider to read the voltage.

However It looks like that if there is no jumper in BAT or REG the voltage divider circuit is independent. Would it be possible to re-wire the voltage divider circuit to measure the RAW 9v from the battery?

Does anyone know what happens to the internal voltage regulator when the battery gets week? Would the vcc library get any idea of what is happening to the current internally?

Cheers

[sven]

Hello!
@fisher
Please have a look here: http://forum.mysensors.org/topic/2989/nrf24l01-range-of-only-few-meters/7
It solves my problems.