It works in both directions. The board is literally a rip-off of this board (even the description): https://www.sparkfun.com/products/12009 . Read the hook-up guide there

BR Jonas

Hi all,
I will upload the projectfiles soon. I'm still waiting for the PCB's to arrive, and I want to make sure that it works (at least to some degree) before I release the files - hope its OK.

BR Jonas

Thank you very much. I think that I will order a couple of sub-GHz modules to do some testing with, but stay with the nRF modules for now - as you say, they are cheap.

BR Jonas

@scalz Yes, the Vishay one is more precies indeed, but my main reason for putting the Silabs one on the board, was to detect the ambient light level.

Reg. the mosfet, yes I could have used a single fet. I think the reason why I did it like this, was that in a previous project, I was controlling higher voltages, hence the need for the n-fet.
Anyway, I'm not sure if I will keep it or if I will just let the radio be powered on, all the time, in the next rev.

BR Jonas

Yes. The two power supplies need a common reference, so the grounds need to be connected.

BR Jonas

I have updated the schematic to rev. 1.1.
The following has been changed:

• Si1133 has been replaced by Si1145
• The mosfets are removed from the radio power path
• Radio pins shuffled around a bit
• FTDI connector removed from PCB and instead I made a programming jig
• All I2C sensors are powered from the same pin of the uC, as well as the I2C pull-ups (haven't decided which pin yet, still routing the PCB)

Comments are more than welcome.

BR Jonas

@ddos Yes, that would work - if VIN1 is pin 5, VOUT1 is pin 6, VIN2 is pin 2 and VOUT2 is pin 3, that is.

It's a bad habbit to have "double pins" in the schematic. You should really make a pin for each ground connection - just my 2 bits.

BR Jonas

It works in both directions. The board is literally a rip-off of this board (even the description): https://www.sparkfun.com/products/12009 . Read the hook-up guide there

BR Jonas

@LastSamurai Yes, thats true. My order is always above the "free shipping" limit
I'll give the datasheets a look, of the devices you mentioned.

BR Jonas

@LastSamurai said:

AT25DF512C

Well not in EU, but you can order from DigiKey or Mouser if everything else fails - thats where I order my parts.

EDIT: And I live in DK - maybe worth mentioning.

BR Jonas

Yes. The two power supplies need a common reference, so the grounds need to be connected.

BR Jonas

@mfalkvidd Yes, sure!

Thank you very much. I think that I will order a couple of sub-GHz modules to do some testing with, but stay with the nRF modules for now - as you say, they are cheap.

BR Jonas

I have updated the schematic to rev. 1.1.
The following has been changed:

• Si1133 has been replaced by Si1145
• The mosfets are removed from the radio power path
• Radio pins shuffled around a bit
• FTDI connector removed from PCB and instead I made a programming jig
• All I2C sensors are powered from the same pin of the uC, as well as the I2C pull-ups (haven't decided which pin yet, still routing the PCB)

Comments are more than welcome.

BR Jonas

@scalz Yes, the Vishay one is more precies indeed, but my main reason for putting the Silabs one on the board, was to detect the ambient light level.

Reg. the mosfet, yes I could have used a single fet. I think the reason why I did it like this, was that in a previous project, I was controlling higher voltages, hence the need for the n-fet.
Anyway, I'm not sure if I will keep it or if I will just let the radio be powered on, all the time, in the next rev.

BR Jonas

Hi all,

what are peoples experiences. On a longer timescale, is the recommended radio the HopeRF one, or could it be Nordic as well? Because of the lower frequency of the HopeRF radios, range/penetration could better, compared to 2.4GHz, but are there any tests that prove this?
What is the general opinion about radio selection?

BR Jonas