Power dock & arduino dock
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 Hello, can anyone tell me if there's a way to use power dock and arduino dock together ? 
 Note : i'm newbie) And my question is about: Use arduino dock and power dock( to power the Omega and charge the battery)
 
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 @leo-moura well, the omega2 is a "stackable" module system , so my guess would be that it would work but [my guesses are less than 100% correct these days] i suggest to contact onion by entering a ticket into the support system. 
 https://onion.freshdesk.com/support/tickets/new
 
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 @Douglas-Kryder The Extensions are stackable - the Docks are not. 
 
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 @leo-moura said in Power dock & arduino dock: there's a way to use power dock and arduino dock together? Power Dock 2 (PD2) with Omega2(+) & Arduino Dock 2 (AD2) without Omega2(+) 
 It seems this can be a useful but maybe not the most economical configuration.You should connect (theoretically - I have not tried this yet) - 
the Expansion Header of PD2 to Omega's socket of AD2 - for example in this way 
 SCL - SCL
 SDA - SDA
 RX1 - RX1
 TX1 - TX1
 for ICSP (for example)
 GPIO0 - GPIO15GPIO1 - GPIO15 (sck = 1)
 GPIO2 - GPIO16 (mosi = 2)
 GPIO3 - GPIO17 (miso = 3)
 GPIO19 - GPIO19 (reset = ~19)
 Note: avrdude has some problem with 'sck = 0' (ie. GPIO0) ?!
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the Expansion Header of PD2 to the Expansion Header of AD2 
 5V - 5V
 GND - GND
 You should install arduino-dock-2and slightly modify theavrdude.confandarduino-dock-lib.shfiles.Good luck! 
 
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 @György-Farkas said in Power dock & arduino dock: @Douglas-Kryder The Extensions are stackable - the Docks are not. hi, since i own each of the modules and the arduino & expansion dock i pretty much was aware that physically it is not possible to "stack" them i used "stackable" in my earlier post in quotes to indicate that most elements are easy to interface although now i realize i should should have just said easy to interface. anyway, your reply to the OP clearly explains what i figured was possible but was unable to explain as well as you did. 
 
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 @leo-moura Sorry! In theory, there is no difference between theory and practice. But, in practice, there is. I connected a first version of PD (using GPIO 01, 2, 3 and 6 instead of01, 2, 3 and 19) and an AD2 with ~10cm / ~4" wires on the above mentioned way.
 Note: firstly I tried to use GPIO 0,1,2 and 3 but avrdude has some problem with 'sck = 0' (ie. GPIO0) ?!
 There isn't any boot problem due to GPIOs.
 The I2C and the serial connection between the two boards are OK- maybe.
 The ICSPis not working at allworks but it's fairly unstable. Probably those "too long" wires and the TXS0108E level shifter cause the problems.
 BTW there are some parasitic logical oscillation - the pulse waveforms of some pins are very-very "dirty". A faulty oscilloscope probe caused these problems.So it seems this arrangement isn't working too well. Unfortunately. It was a quick "test" only. Further investigations and more spare time are needed. Is it worth it? I'm really sorry.  
 
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 @György-Farkas thank you so much for all informations . 
 
