[Tutorial] openHAB with serial gateway

[TimO]

The support for a baudrate of 115.200, which is used by the MySensor serial gateway, is available since 1.7.0 in the OpenHab serial binding.

You're able to remove the old version with "apt-get remove ...", no need to replace the files. Just use the installation in /opt.

[Tango2]

Thanks @TimO. I got everything running in /opt (@9600, but I can change that later), and am receiving humidity/temp stats from my one sensor module running on a nano with DHT22 connected. I need to go through and do some major cleanup now, and also figure out how to convert to from F to C for the temp. It seems like the stock code has provisions for that, however I haven't quite figured out how to enable the change yet.

Thanks for the help - I look forward to implementing more of these sensors.

[guzzler]

I am having trouble getting Arduino Nano detected by Raspberry Pi via USB.

I could see this in the monitor when I selected the correct baudrate:

 0;0;3;0;14;Gateway startup complete.

[151199.509040] usb 1-1.2: new full-speed USB device number 5 using dwc_otg
[151199.612259] usb 1-1.2: New USB device found, idVendor=1a86, idProduct=7523
[151199.612296] usb 1-1.2: New USB device strings: Mfr=0, Product=2,
SerialNumber=0
[151199.612314] usb 1-1.2: Product: USB2.0-Serial
[153464.158413] usb 1-1.2: USB disconnect, device number 5
[153715.311307] usb 1-1.3: new full-speed USB device number 6 using dwc_otg
[153715.414679] usb 1-1.3: New USB device found, idVendor=1a86, idProduct=7523
[153715.414717] usb 1-1.3: New USB device strings: Mfr=0, Product=2,
SerialNumber=0
[153715.414733] usb 1-1.3: Product: USB2.0-Serial

Initially while flashing serial gateway sketch to nano from Mac I had some trouble to get the right drivers. After following this post it worked fine. Is this to do with chinese knock offs?
http://kiguino.moos.io/2014/12/31/how-to-use-arduino-nano-mini-pro-with-CH340G-on-mac-osx-yosemite.html

Also I installed Arduino sketch on Raspberry pi with apt-get install arduino: When I launch Arduino and go to Tools>Port is disabled.

Is there anything I need to do on RPi so it can detect Arduino Nano knock pff?

[TimO]

I followed the link to the page you mentioned and from there to the chinese page.
There is a zip-file for linux too, maybe you need to install the driver on the RPi too?

http://www.wch.cn/download/CH341SER_LINUX_ZIP.html

Just a guess. :-)

[guzzler]

Thanks @TimO .

I have been trying to make and load that driver but cannot get hands on 3.12.28+ kernel source. It wont compile without it.

I am wondering how come no body has come accross this issue, I bought my Arduino Nano from one of the links on mysensors store.

http://www.aliexpress.com/item/1-pcs-for-Nano-V3-0-ATmega328P-Module-Board-Free-Mini-USB-Cable-for-Arduino-Compatible/1397847851.html?aff_platform=aaf&sk=3jYZr3nAE%3A&aff_trace_key=23901740799811215&cpt=1431974332161

[Jan Gatzke]

I don't understand why everybody is using an USB connection for the serial gateway when openHAB is running on a raspberry pi. The pi has a rock stable uart with 3.3V logic. There is no need to convert the arduinos uart to USB. Just connect RX to TX and TX to RX. Connect ground to ground and VCC of the arduino to the 3.3V pin of the pi and you are done. The official openHAB wiki contains instructions on how to use the onboard uart of the pi: https://github.com/openhab/openhab/wiki/Serial-Binding

[guzzler]

@Jan-Gatzke Thanks for the pointer. I will try that.

I think the reason is lack of understanding. After reading sea of information I am able to pull together the basic architecture of how this would work.

[poeml]

@guzzler I stumbled over the same issue. The FTDI chip on my Nano is correctly recognized as USB device when I attach it to the Raspi. However, when I reboot the Raspi, the device is not there. I need to unplug and replug it.

That's not normal behaviour of an USB device. And it's quite hindering deploying the Nano as gateway via USB-serial. Maybe it has something to do with automatically performed reset on the Arduino Nano board??

(The hint about attaching directly to serial is great. Noted for later.)

[poeml]

@poeml more precisely, the Nano's FTDI chip connects to the booting Raspberry, but instead of registering a single device there are 4 (!) log lines claiming registering 4 devices (very funny), and none of the devices are bound.

May 23 23:16:21 bramble kernel: [    3.738087] usb 1-1.5: new full-speed USB device number 5 using dwc_otg
May 23 23:16:21 bramble kernel: [    4.283520] usb 1-1.5: new full-speed USB device number 6 using dwc_otg
May 23 23:16:21 bramble kernel: [    4.768136] usb 1-1.5: new full-speed USB device number 7 using dwc_otg
May 23 23:16:21 bramble kernel: [    5.268161] usb 1-1.5: new full-speed USB device number 8 using dwc_otg

I don't find a way to trigger re-registering the device, or power-cycle the USB port, via software. I can only power-cycle the whole USB bridge, which means that the LED goes out (the Ethernet chip is switched off as well...) and LED goes on again, but with the same faulty registering as when booting.

 # cat reset-usb
#!/bin/bash
echo 0 > /sys/bus/usb/devices/1-1/authorized
sleep 1
echo 1 > /sys/bus/usb/devices/1-1/authorized

Unplugging and replugging always works.

For the record: Raspberry Pi version 2 with the 4 USB ports, just updated to Debian 8.0 (Jessie). I didn't check with Debian Wheezy if it worked then. The Nano was linked from MySensors store I believe and works great otherwise. I have two of them and both have the same problem (or the Raspi's USB stack has the problem, who knows).

[gizmosensor]

Great tutorial! Thank you for putting this together.

My controller is on RPi, and I'm using a Nano for mySerial gateway with the USB plugged into the RPi. When I specify the port as follows I get the following message

String Arduino "Arduino" { serial="/dev/ttyUSB0@115200" }

org.openhab.model.item.binding.BindingConfigParseException: Could not open serial port /dev/ttyUSB0@115200: Serial port '/dev/ttyUSB0@115200' could not be found. Available ports are:
/dev/ttyUSB0

MySensors.h has the following
#define BAUD_RATE 115200

I tried taking out @115200, I see openhab.log showing it trying to read garbage and the rules failing. So, I', thinking the garbage is because openhab is not reading it with the right baud rate. However, openhab on the RPi doesn't like /dev/ttyUSB0@115200

Any ideas anyone?

[Jan Gatzke]

Your Version of openHAB is to old. You need openHAB 1.7 to set the baud rate with @xxxxx. Update openHAB or recompile the gateway sketch with 9600 baud in config.h.

[gregl]

@poeml Just a thought - try connecting the nano to the rpi via a USB hub.

[gizmosensor]

@Jan-Gatzke That seemed to work. I'm getting readable data now. Thanks!

I also set the nodeId to 15 (The above example assumed it was set to 101), as follows in the sensor

gw.begin(NULL, 15);

I adjusted the mapping accordingly in the mapping, as specified in the tutorial using 15 instead of 101. The following is now being output from event.log

2015-05-31 22:18:33 - livingTemp01 state updated to 22

[almj]

Dear all,

I've stuck. Please help me to understand.
Currently I have a serial gateway and openHAB 1.7. I've managed to get controller working and send commands to openhab installed on Windows.

Now I need to understand how to convert commands from the gateway.

I have a rule

rule "Arduino sends to Openhab"
    when
        Item Arduino received update
    then
        var String lineBuffer =  Arduino.state.toString.split("\n")
        for (String line : lineBuffer) {
            var String[] message = line.split(";")
            var Integer nodeId = new Integer(message.get(0))
            var Integer childId = new Integer(message.get(1))
            var Integer msgType = new Integer(message.get(2))
            var Integer ack = new Integer(message.get(3))
            var Integer subType = new Integer(message.get(4))
            var String msg = message.get(5)
			
            if(msgType == 3 ){
                if (subType == 9){
					sendCommand(Arduino_Motion1, ON)
					pushover("Motion Detected", -1)
		} } }			
end

items:

String Arduino "Serial" {serial="COM4@115200"}
Switch Arduino_Motion1 	"Motion" <siren>

and a sitemap

sitemap home label="Home"
{

Frame label="Serial" {
Switch item=Arduino_Motion1 label="Motion Sensor"
} } 

So in debug I have following:

2015-06-01 12:51:29.154 [INFO ] [runtime.busevents             ] - Arduino state updated to 0;0;3;0;9;read: 1-1-0 s=1,c=1,t=16,pt=0,l=1:1
1;1;1;0;16;1

2015-06-01 12:51:29.156 [INFO ] [runtime.busevents             ] - Arduino_Motion1 received command ON

So I've found an example of temp sensor but not the motion...
Pushover sends me notifications when motion sensor send 0 to the gateway every minute or so. (0;0;3;0;9;read: 1-1-0 s=1,c=1,t=16,pt=0,l=1:0). I don't understand how can I separate last 0 from 1.
I know I'm on a last step, please help :)

Thank you!

[almj]

Thanks for help ;)
Figured out it by myself

[Jan Gatzke]

Would you mind to share the solution?

[C.r.a.z.y.]

@TimO Hi do you work with Openhab 2.0? I tried to install it and couldnt create a binding, its very hard for me. I need auto Discovery of mysensors with 2.0

[Jan Gatzke]

A 2.0 binding would be great. How far did you get?

[TimO]

Last time I've tested Openhab 2.0 there were some (well known) serious bugs and it still is only an alpha version. An MySensors binding for Openhab would be really cool and I will give it a try, but not for the 1.X Version, because of the lack of autodiscovery mechanisms in Openhab itself and because I think it is a little bit too early for Openhab 2.0.

[C.r.a.z.y.]

@TimO ok 2.0 alpha...

An idea for 1.x; Ready-Discovery ?
We write 250 mysensors items like ID=1-30 for switches, 31-50 for contacts, 51-70 for motion etc... if item is available then sitemap will show them.

Is there anyway to create rules on frontend? Maybe IFTTT + MySensors goes well..