Perhaps a silly question, but can you hook up the Nano for RF send/receive to the rx/tx and the rx/tx a the Raspberry Pi ?
For some situations a faceplate print with nano on top of it would be easier (and better looks) if you don’t have to connect a USB cable from the Nano to the Pi.
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Homeduino via rx/tx serial instead of USB?
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@koffienl
See http://forum.pimatic.org/topic/858/solved-connect-arduino-pro-mini-via-serial-interface/5
and
http://blog.oscarliang.net/raspberry-pi-and-arduino-connected-serial-gpio/"It always takes longer than you expect, even when you take into account Hofstadter's Law.", Hofstadter's Law
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Thanks for the quick reply.
So if I understand correctly I can connect a allready flashed Nano using 2 resistors as voltage divider to the Pi and all I have to do is change the plugin config to"serialDevice": "/dev/ttyAMA0",Correct ?
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@koffienl said:
Correct
Yes, follow the instructions given in the blogpost. On the pimatic-side it is just a matter of using the different tty device (/dev/ttyAMA0).
"It always takes longer than you expect, even when you take into account Hofstadter's Law.", Hofstadter's Law
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I’m a bit confused.
After re-reading how to power a Nano I remembered you can’t / shouldn’t power a nano through the 5v pin but through the VIN pin. Problem is, this input needs at least 6.2v for the onboard regulator.
Is it possible to power a nano straight from the Raspberry Pi ?
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I’ve got a pro mini powered from the gpio and a nano powered from a 4.2V lithium battery.
They both work perfectly!
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What pins did you use to bring the power to the Nano ?
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@koffienl
You can power the Arduino through the 5V Pin. This isnt really a problem. Have done it multiple times.pimatic rocks!!!
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Thanks for confirming.
I’m trying to make a PCB that can be put on top of the headers of a Pi. The PCB will contain a Arduino Nano, RF modules and some screwterminals. One screwterminal can be used to wire a DS18B20 to the Pi.
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@koffienl said:
What pins did you use to bring the power to the Nano ?
I’ve used the 5V, pin 3 on the raspberry I think and pin 5 on the raspberry which is ground.
On the nano I use the vin and gnd pins -
That surprises me? I thought the VIN shoudl get at least 6.2v to work.
I will give both a try
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I’ve searched a little on the web on this and it seems that its recommended to have an input voltage of at least 6V indeed.
But I haven’t noticed any problems with using a battery on this input. -
The Arduino Nano can be powered via the Mini-B USB connection, 6-20V unregulated external power supply (pin 30), or 5V regulated external power supply (pin 27). The power source is automatically selected to the highest voltage source.
https://www.arduino.cc/en/Main/ArduinoBoardNanoFollow my domotica project on http://maredana.nl
