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Oh what a beautiful sound


#1

Oh how beautiful it is to hear the USB device detection sound as Windows recognizes a brand new board design. :dance: :dance:

I just got my G120 based prototype board up and running! (Had to share with someone who would appreciate it. The wife doesn’t quite understand. :wink: )

I/O options to the terminals are set using solder jumpers on the back of the board.
4 - 24Vdc, 100mA sinking outputs
4 - 24Vdc Inputs
2 - 12bit Analog Input, 0-10Vdc (I2C ADC)
2 - 12bit Analog Output, 0-5Vdc (I2C DAC)
1 - RS485
1 - RS232
1 - CAN

3 - Gadgeteer Sockets (AIKUX, AITX, PSUY)
microSD
7-36Vdc Input
Passive PoE.
256 byte EEPROM with preprogrammed MAC address.

Solder pads are available for a 2nd RS232 and USB Host.

2mm dual row header has Vin, +5, +3.3, CAN2, SPI3, I2C, COM2(RX,TX,RTS,CTS), RTC Battery, 12Bit Analog Input.

Once this board is proven I have plans to add some matching boards.
-120Vac Power Supply
-Cellular modem
-Battery controller/charger
-Additional I/O

Next step, check out Turnkey Assembly . . . .


#2

Looks great, Congrats!


#3

With very few exceptions, we are all in that boat. Anyway, we love to see naked boards around here. :slight_smile:

Nice work. Looks like a 4 layer board too judging from all the via’s on the top connected to nothing :slight_smile:


#4

Purrrrrrty! I use the same DC-DC converter ;D


#5

Congrats! What is it for?


#6

@ ianlee74 - it’s a vital component in a turbo-encabulator.


#7

What DC-DC converter is it, exactly?


#8

@ Dave McLaughlin - I will try to add to the collection of naked boards on the site. I have 2 more .netmf boards in the wings.

This board is actually 6 layers. The fan out off the G120 with the parts being directly above it made it tricky. It probably could have been done with 4 if I didn’t use the middle 2 layers as only power and ground. 6 made it much easier. (The vias are exposed because I must have given the wrong layers for the solder mask. The upshot is for prototyping I can easily find pretty much every signal for testing.)

@ Iggmoe and @ godefroi - This is my first design using the little guy. Its hard to beat 6-36Vdc input and 5Vdc@ 1.5A output at that size for only $4.30. If anyone else is interested its a OKI-78SR-5 from muRata: http://power.murata.com/data/power/oki-78sr.pdf

@ ianlee - Its intended for multiple industrial control and monitoring projects. I needed something small with 24Vdc I/O and the ability to interface to standard industrial sensors.

I opted for the G120 over the STM32 for a couple of reasons. Primarily the availability of the Premium GHI libraries. Even though they have combined everything into 1 package there are still certain features not available on the STM32 due to memory. (The recent forum discussion about USB Host vs RLP is a great example.


#9

@ hagster - Love the video! ;D

I sometimes do some stage acting in a local theater company. I think I will use it as my next monologue for an addition.

They alway accuse me of talking to techy and over their head anyway. :stuck_out_tongue:


#10

They will accuse you of being techy if you start doing sums in the middle of an audition.
:slight_smile:


#11

I use them myself. For small design runs they are cheaper than separate parts as often you have to purchase the inductors in quantities of 5 or 10 and that makes 1 or 2 off expensive. They are also idea for powering designs in protoboard too. As easy as using a 7805 but without the heating :slight_smile:

Recom and Traco also do them but they cost considerable more for the same thing. I’ve found the Murata ones to be very reliable. I keep a handy stock of 3.3V and 5.0V 1A devices…


#12

Oh, sure enough, I didn’t recognize it laying on its side. I’ve used one myself, for an automatic sprinkler system. Being able to use the same 24v transformer is very nice.


#13

Good. It will surely replace the Recom R78B5.0-1 on all our next devices.


#14

Note to self:
Don’t touch the OKI-78SR-5 on the top during operation. It will cause a voltage spike on the output. I am running with 24Vdc in and I got a spike up to 22Vdc. Needless to say 10Vdc tantalum capacitors don’t like 22Vdc very well. They fail so spectacularly!