Working with IC2 pins with node-red-contrib-gpio
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Tad Siminitz
Jun 13, 2016, 4:01:00 PM6/13/16
to Node-RED
Hi - I have a sensor BME280 IC2/SPI that does Temp + Humidy + Pressure. I have (finally) installed the Johnny5 node after some hiccups.
GPIO in and out seem to be working ok. The johnn5 function node however (even though it says connected) always throws the same error
Error: I2C pins not in I2C mode
I have followed some links in describing that i need to enable IC2 though raspi-config and put the following entries into /etc/modules
i2c-bcm2708 i2c-dev
this is not making the message go away. Any suggestions?
Dave C-J
Jun 13, 2016, 4:07:35 PM6/13/16
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Is that the same as using raspi-config to enable it ?
maybe some other useful debug here - http://www.raspberrypi-spy.co.uk/2014/11/enabling-the-i2c-interface-on-the-raspberry-pi/
Tad Siminitz
Jun 13, 2016, 4:39:39 PM6/13/16
to Node-RED
That is the exact thing I went with . still have the errors though.
Colin Law
Jun 13, 2016, 4:45:02 PM6/13/16
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On 13 June 2016 at 21:39, Tad Siminitz <tsim...@gmail.com> wrote:
> That is the exact thing I went with . still have the errors though.
What is the exact thing you went with?
> That is the exact thing I went with . still have the errors though.
Colin
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Tad Siminitz
Jun 13, 2016, 5:37:33 PM6/13/16
to Node-RED
this link which i believe you pointed to..
On Monday, June 13, 2016 at 4:01:00 PM UTC-4, Tad Siminitz wrote:
Dave C-J
Jun 13, 2016, 5:45:07 PM6/13/16
to node...@googlegroups.com
And did
sudo i2cdetect -y 1
work ? - ie can you get any response outside of Node-RED ?
Tad Siminitz
Jun 14, 2016, 8:18:47 AM6/14/16
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this is what this command gives me
root@raspberrypi:/boot# sudo i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
--
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peter adshead
Jun 14, 2016, 8:46:08 AM6/14/16
to Node-RED
That's saying no device , found .
Check resistors fitted , check sda and sck are right way around.
The pi is not 5v tolerant so pull up resistors to 3.3 volt and not the 5v rail.
Check for common ground.
The software and setup part is right or you would just get a error.
Luis Montes
Jun 14, 2016, 1:57:02 PM6/14/16
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Ok, got this figured out.
It's now in big bold words on the raspi-io readme :)
Warning: this module must be installed as a normal user, but run as the root user
It's now in big bold words on the raspi-io readme :)
Warning: this module must be installed as a normal user, but run as the root user
So do the raspi-io install as the pi user then copy the raspi-io folder into the /root/.node-red/node_modules/ folder and run node-red as root.
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Tad Siminitz
Jun 14, 2016, 3:13:06 PM6/14/16
to Node-RED
Thanks for the help. I think Peter is on to something and the problem may be occurring before I get to node-red.
I minimized the connections... following the steps on https://xdevs.com/guide/thp_rpi/
so. on BME280 I did the following ...
| Signal | Raspberry Pi pin number | BME280 pin |
| Power | Pin 2 | VIN pin |
| Data SDA | Pin 3 | SDI pin |
| Clock SCL | Pin 5 | SCK pin |
| Ground | Pin 6 | GND pin |
then ran i2cdetect -y 1
I get the following indicating nothing is connected. I have enabled IC2 on my raspberry. Could my sensor be fried?
I can get the yellow GPIO pins to work, but with another (moisture) sensor.
Tad
sudo i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
On Monday, June 13, 2016 at 4:01:00 PM UTC-4, Tad Siminitz wrote:
Luis Montes
Jun 21, 2016, 12:07:29 PM6/21/16
to node...@googlegroups.com
Tim Choo wrote up an excellent blog post that may help: https://timchooblog.wordpress.com/2016/06/14/configuring-the-johnny-five-robotics-library-to-work-in-node-red/
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