💬 MySI2CNode - Node for I2C devices, CR123 or USB powered

[openhardware.io]

https://www.openhardware.io/view/295/MySI2CNode-Node-for-I2C-devices-CR123-or-USB-powered

[Dave Robson]

Sorry, probably something simple but when I enable DEBUG I get an error "'SLEEP_TIME' does not name a type" on the line "SLEEP_TIME = 15000UL; // If debug, TX every 15s"

[emc2]

My bad, please replace

const unsigned long SLEEP_TIME = 1800000UL; // Sleep time between reads (in milliseconds)
#if defined MY_DEBUG
SLEEP_TIME = 15000UL; // If debug, TX every 15s
#endif

by

#if defined MY_DEBUG
const unsigned long SLEEP_TIME = 15000UL; // If debug, TX every 15s
#else
const unsigned long SLEEP_TIME = 1800000UL; // Sleep time between reads (in milliseconds), 30min
#endif

Corrected code will be uploaded in a few minutes.

Thanks!

[Dave Robson]

Thanks, that works. I had a lot of issues soldering on the radio, I now have 1 of 2 working getting node ID but it's still not sending any temp/hum data and I'm not seeing any errors.

[emc2]

Soldering the radio is the tricky part if you are using it with a battery holder as you need to solder it last. A fine tip on the soldering iron is a must.
Before powering up, I would recommend using a multimeter in continuity mode and check every radio solder pads. Pads next to each other should not be in contact. You can also trace back each pad back to their respective arduino pin and see if you have continuity there.

For temp/hum data it could be because of many things:

• First, did you add a temp/hum sensor? This PCB is designed to add I2C sensors but by itself do not have any.
• If you did, which one did you add? Provided example sketch is for si7021 based sensors such as https://www.aliexpress.com/item/Industrial-High-Precision-Si7021-Humidity-Sensor-with-I2C-Interface-for-Arduino/32524005324.html or https://www.aliexpress.com/item/Humidity-Sensor-with-I2C-Interface-Si7021-for-Arduino-Industrial-High-Precision/32687207471.html These two should work out of the box with the included sketch.
• Is your sensor working on an arduino without MySensors? You may need to adapt the code to your specific sensor (different I2C address maybe?).

[Dave Robson]

I spent a bit of time with a solder pump and solder wick getting rid of the bridges across the pads and I have no shorts but the one node refuses to connect.

I'm using the si7021 sensor that's been tested on a test node I have set up. It's connecting and getting a node ID, sends the variable names and then seems to stop without any errors.

4296 !TSF:MSG:SEND,3-3-0-0,s=255,c=3,t=11,pt=0,l=25,sg=0,ft=0,st=NACK:Temperature Humidity node
4343 !TSF:MSG:SEND,3-3-0-0,s=255,c=3,t=12,pt=0,l=3,sg=0,ft=1,st=NACK:2.0
4352 MCO:SLP:MS=500,SMS=0,I1=255,M1=255,I2=255,M2=255
4358 MCO:SLP:TPD
4360 MCO:SLP:WUP=-1
4403 !TSF:MSG:SEND,3-3-0-0,s=0,c=0,t=7,pt=0,l=10,sg=0,ft=2,st=NACK:Plants Hum
4411 MCO:SLP:MS=500,SMS=0,I1=255,M1=255,I2=255,M2=255
4417 MCO:SLP:TPD
4419 MCO:SLP:WUP=-1
4427 TSF:MSG:SEND,3-3-0-0,s=1,c=0,t=6,pt=0,l=11,sg=0,ft=3,st=OK:Plants Temp
4435 MCO:REG:REQ
4450 TSF:MSG:SEND,3-3-0-0,s=255,c=3,t=26,pt=1,l=1,sg=0,ft=0,st=OK:2
4458 TSF:MSG:READ,0-0-3,s=255,c=3,t=27,pt=1,l=1,sg=0:1
4464 MCO:PIM:NODE REG=1
4466 MCO:BGN:STP

[emc2]

I see a lot of "!TSF" and "NACK" which seems to be radio communication problems.
That's MySensors related and can be related to many things, from soldering problem to power / capacitor issues.

In MY_DEBUG mode you should see your temp/hum printed on serial every ~15s so there is something wrong there, either wiring or a code issue.

Ty with the example included with the library "i2c_SI7021.h", without any MySensors related stuff, to see if your sensor is detected. You should see temp/hum on the serial.