@LastSamurai thanks, progress, I'm getting this now, which means it's working! Finally, a working node from a complete rookie like me!

Serial started
Voltage: 3389 mV
Internal temp: 266.00 *C
send: 100-100-0-0 s=255,c=3,t=15,pt=2,l=2,sg=0,st=ok:0
send: 100-100-0-0 s=255,c=0,t=17,pt=0,l=5,sg=0,st=ok:1.5.4
send: 100-100-0-0 s=255,c=3,t=6,pt=1,l=1,sg=0,st=ok:0
read: 0-0-100 s=255,c=3,t=15,pt=0,l=2,sg=0:

sensor started, id=100, parent=0, distance=1
send: 100-100-0-0 s=255,c=3,t=11,pt=0,l=12,sg=0,st=fail:TempHumTest2
send: 100-100-0-0 s=255,c=3,t=12,pt=0,l=12,sg=0,st=fail:1.0 17052016
send: 100-100-0-0 s=0,c=0,t=6,pt=0,l=0,sg=0,st=fail:
send: 100-100-0-0 s=1,c=0,t=7,pt=0,l=0,sg=0,st=fail:
Node and 2 children presented.
T: 998.00
TempDiff :1098.00
send: 100-100-0-0 s=0,c=1,t=0,pt=7,l=5,sg=0,st=fail:998.0
T sent!
H: 118
HumDiff  :218.00
send: 100-100-0-0 s=1,c=1,t=1,pt=2,l=2,sg=0,st=ok:118
H sent!
Battery voltage: 3359 mV
Battery percent: 104 %
send: 100-100-0-0 s=255,c=3,t=0,pt=1,l=1,sg=0,st=ok:104

I think that the readings are not accurate though, not sure why, but I'll have a go at figuring our why anyway!

@LastSamurai I'm having a go as well at updating the .ino file with the different library, but I'm not a coder so I'm "having a hack" - if you have any luck could you post your code?

@GertSanders hmmm I think I'm using that same one as @LastSamurai so I suspect that's the issue? It's the one linked in the first post

I guess if that's the problem it should have been obvious to me, it even says HTU21D on mine! Silly me!

Ok, so I messed up my previous sensor trying to solder the bridge (don't ask...) I have now (I think) soldered it and reconnected it, am now getting the following:

Serial started
Voltage: 3359 mV
send: 132-132-0-0 s=255,c=3,t=15,pt=2,l=2,sg=0,st=fail:0
send: 132-132-0-0 s=255,c=0,t=17,pt=0,l=5,sg=0,st=fail:1.5.4
send: 132-132-0-0 s=255,c=3,t=6,pt=1,l=1,sg=0,st=fail:0
sensor started, id=132, parent=0, distance=1
send: 132-132-0-0 s=255,c=3,t=11,pt=0,l=15,sg=0,st=fail:EgTmpHumBat5min
send: 132-132-0-0 s=255,c=3,t=12,pt=0,l=10,sg=0,st=fail:1.0 151106
send: 132-132-0-0 s=0,c=0,t=6,pt=0,l=0,sg=0,st=fail:
find parent
send: 132-132-255-255 s=255,c=3,t=7,pt=0,l=0,sg=0,st=bc:
send: 132-132-0-0 s=1,c=0,t=7,pt=0,l=0,sg=0,st=fail:
Node and 2 children presented.

I'm going to try get everything on a breadboard, but now I see fails, what's that all about?

PS will upload some pics of the soldered bridge...

Tried it this evening, still no luck, let me see what I can get up to over the weekend.

@m26872 thanks! No time tonight, but a job for testing tomorrow.

@m26872 oh! I didn't realise I needed to do that, could that be the problem? Do I just need to fill with solder the bit just below where the DA and "-" is?

Some pictures anyway!

Thanks both, I have the "pre-modded" si7021, so it's the one that should operate at between the 1.9 and 3.3v. I the Arduino I used to burn the Atmega is a knockoff, so it has both 3.3v and 5v. Let me do some research and see if I can test the si7021 using it.

@m26872 thanks, yes, I guessed that something might be wrong with the sensor, I checked continuity between the board and the sensor and all seemed fine.

To test on an Arduino, I've honestly very little clue how to do this. Could I utilise the breadboard and Arduino I used to flash the AtMega?

Maybe I need to add that I'm running the 2.0 MQTT controller? Not sure if that makes a difference? GatewayW5100MQTTClient

Just had a look what's going on on the controller side, this is what I see

0;255;3;0;9;Starting gateway (RNNGA-, 2.0.0-beta)
0;255;3;0;9;Radio init successful.
0;255;3;0;9;Init complete, id=0, parent=0, distance=0
0;255;3;0;9;Attempting MQTT connection...
0;255;3;0;9;MQTT connected
0;255;3;0;9;read: 132-132-0 s=255,c=3,t=15,pt=2,l=2,sg=0:0
0;255;3;0;9;send: 0-0-132-132 s=255,c=3,t=15,pt=0,l=2,sg=0,st=ok:

0;255;3;0;9;read: 132-132-0 s=255,c=0,t=17,pt=0,l=5,sg=0:1.5.4
0;255;3;0;9;Sending message on topic: mygateway1-out/132/255/0/0/17
0;255;3;0;9;read: 132-132-0 s=255,c=3,t=6,pt=1,l=1,sg=0:0
0;255;3;0;9;Sending message on topic: mygateway1-out/132/255/3/0/6
0;255;3;0;9;read: 132-132-0 s=255,c=3,t=11,pt=0,l=15,sg=0:EgTmpHumBat5min
0;255;3;0;9;Sending message on topic: mygateway1-out/132/255/3/0/11
0;255;3;0;9;read: 132-132-0 s=255,c=3,t=12,pt=0,l=10,sg=0:1.0 151106
0;255;3;0;9;Sending message on topic: mygateway1-out/132/255/3/0/12
0;255;3;0;9;read: 132-132-0 s=0,c=0,t=6,pt=0,l=0,sg=0:
0;255;3;0;9;Sending message on topic: mygateway1-out/132/0/0/0/6
0;255;3;0;9;read: 132-132-0 s=1,c=0,t=7,pt=0,l=0,sg=0:
0;255;3;0;9;Sending message on topic: mygateway1-out/132/1/0/0/7

@m26872 thanks, I've set that, no change even after more than 15seconds and debug set.

Could it be the way I've connected the si7021? I've got it as follows:

1. A4 to SDA
2. A5 to SCL
3. GND to GND
4. VCC to 3.3v

So I think I've finally got everything up and running! This is what I'm getting at the serial monitor in the IDE:

Serial started
Voltage: 3359 mV
send: 132-132-0-0 s=255,c=3,t=15,pt=2,l=2,sg=0,st=ok:0
send: 132-132-0-0 s=255,c=0,t=17,pt=0,l=5,sg=0,st=ok:1.5.4
send: 132-132-0-0 s=255,c=3,t=6,pt=1,l=1,sg=0,st=ok:0
read: 0-0-132 s=255,c=3,t=15,pt=0,l=2,sg=0:

sensor started, id=132, parent=0, distance=1
send: 132-132-0-0 s=255,c=3,t=11,pt=0,l=15,sg=0,st=ok:EgTmpHumBat5min
send: 132-132-0-0 s=255,c=3,t=12,pt=0,l=10,sg=0,st=ok:1.0 151106
send: 132-132-0-0 s=0,c=0,t=6,pt=0,l=0,sg=0,st=ok:
send: 132-132-0-0 s=1,c=0,t=7,pt=0,l=0,sg=0,st=ok:
Node and 2 children presented.

What I'm trying to figure out is where the temp and humidity reading are so I can get them into MQTT/OpenHab. Looking at the output, I can't see which one is the temp, humidity or battery level?

@siod I was in much the same position as you, but the simple suggestion is to use the SI7021, as per this thread. Otherwise, the links in the other thread are for the 5v builds.

@siod my understanding was that the voltage which is provided by the slim node wouldn't be suitable for the DHT11 and DHT22, as they require a minimum of 3.3v. There is some discussion here on the DHT22, which I understand has the same voltage requirements as the DHT11.

I just received my non-3.3v Si7021, and have now updated the lessons learnt post, as this board is tiny and I managed to mess up the soldering completely. Ordered the 3.3 ready version now, another month wait...

It lives! Well the one node I created does at least! I'll troubleshoot it, but the problem was the R1 resistor, which I (noobishly) forgot about! But very pleased, and thanks to m26872 especially and everyone else who helped.

I've updated the lessons learn post too!

@m26872 well that is probably it! I didn't even realise I needed that, oops! Sorry :disappointed: ! Let me try and get one (I think I have some already) and get soldering

OK so I changed the polarity of the 4.7uf capacitor and I'm still receiving the same error. So I built a barebones one without sensor and without NRF. I am still getting the same error when uploading the sketch via the FTDI adaptor. I tried uploading a sketch to a Sensebender I have and it worked fine, so that rules out the FTDI adaptor.

Some pics in case someone can spot something obvious.

http://i.imgur.com/1SV0qO2.jpg

http://i.imgur.com/mUp87hB.jpg

http://i.imgur.com/oCqcDpo.jpg

So I can only think that it must be related to the ATMega bootloader? In the how to burn a bootloader thread, I received the following when trying to burn the bootloader, so I assumed it uploaded correctly?

C:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\tools\avr/bin/avrdude -CC:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\tools\avr/etc/avrdude.conf -v -patmega328p -cstk500v1 -PCOM5 -b19200 -e -Ulock:w:0x3F:m -Uefuse:w:0x05:m -Uhfuse:w:0xDE:m -Ulfuse:w:0xFF:m 

avrdude: Version 6.0.1, compiled on Apr 15 2015 at 19:59:58
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2009 Joerg Wunsch

         System wide configuration file is "C:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\tools\avr/etc/avrdude.conf"

         Using Port                    : COM5
         Using Programmer              : stk500v1
         Overriding Baud Rate          : 19200
         AVR Part                      : ATmega328P
         Chip Erase delay              : 9000 us
         PAGEL                         : PD7
         BS2                           : PC2
         RESET disposition             : dedicated
         RETRY pulse                   : SCK
         serial program mode           : yes
         parallel program mode         : yes
         Timeout                       : 200
         StabDelay                     : 100
         CmdexeDelay                   : 25
         SyncLoops                     : 32
         ByteDelay                     : 0
         PollIndex                     : 3
         PollValue                     : 0x53
         Memory Detail                 :

                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           eeprom        65    20     4    0 no       1024    4      0  3600  3600 0xff 0xff
           flash         65     6   128    0 yes     32768  128    256  4500  4500 0xff 0xff
           lfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           hfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           efuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           lock           0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           calibration    0     0     0    0 no          1    0      0     0     0 0x00 0x00
           signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00

         Programmer Type : STK500
         Description     : Atmel STK500 Version 1.x firmware
         Hardware Version: 2
         Firmware Version: 1.18
         Topcard         : Unknown
         Vtarget         : 0.0 V
         Varef           : 0.0 V
         Oscillator      : Off
         SCK period      : 0.1 us

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.02s

avrdude: Device signature = 0x1e950f
avrdude: erasing chip
avrdude: reading input file "0x3F"
avrdude: writing lock (1 bytes):

Writing | ################################################## | 100% 0.01s

avrdude: 1 bytes of lock written
avrdude: verifying lock memory against 0x3F:
avrdude: load data lock data from input file 0x3F:
avrdude: input file 0x3F contains 1 bytes
avrdude: reading on-chip lock data:

C:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\tools\avr/bin/avrdude -CC:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\tools\avr/etc/avrdude.conf -v -patmega328p -cstk500v1 -PCOM5 -b19200 -Uflash:w:C:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\arduino\avr/bootloaders/optiboot/optiboot_atmega328.hex:i -Ulock:w:0x0F:m 
Reading | ################################################## | 100% 0.01s

avrdude: verifying ...
avrdude: 1 bytes of lock verified
avrdude: reading input file "0x05"
avrdude: writing efuse (1 bytes):

Writing | ################################################## | 100% 0.01s

avrdude: 1 bytes of efuse written
avrdude: verifying efuse memory against 0x05:
avrdude: load data efuse data from input file 0x05:
avrdude: input file 0x05 contains 1 bytes
avrdude: reading on-chip efuse data:

Reading | ################################################## | 100% 0.01s

avrdude: verifying ...
avrdude: 1 bytes of efuse verified
avrdude: reading input file "0xDE"
avrdude: writing hfuse (1 bytes):

Writing | ################################################## | 100% 0.01s

avrdude: 1 bytes of hfuse written
avrdude: verifying hfuse memory against 0xDE:
avrdude: load data hfuse data from input file 0xDE:
avrdude: input file 0xDE contains 1 bytes
avrdude: reading on-chip hfuse data:

Reading | ################################################## | 100% 0.01s

avrdude: verifying ...
avrdude: 1 bytes of hfuse verified
avrdude: reading input file "0xFF"
avrdude: writing lfuse (1 bytes):

Writing | ################################################## | 100% 0.01s

avrdude: 1 bytes of lfuse written
avrdude: verifying lfuse memory against 0xFF:
avrdude: load data lfuse data from input file 0xFF:
avrdude: input file 0xFF contains 1 bytes
avrdude: reading on-chip lfuse data:

Reading | ################################################## | 100% 0.01s

avrdude: verifying ...
avrdude: 1 bytes of lfuse verified

avrdude done.  Thank you.


avrdude: Version 6.0.1, compiled on Apr 15 2015 at 19:59:58
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2009 Joerg Wunsch

         System wide configuration file is "C:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\tools\avr/etc/avrdude.conf"

         Using Port                    : COM5
         Using Programmer              : stk500v1
         Overriding Baud Rate          : 19200
         AVR Part                      : ATmega328P
         Chip Erase delay              : 9000 us
         PAGEL                         : PD7
         BS2                           : PC2
         RESET disposition             : dedicated
         RETRY pulse                   : SCK
         serial program mode           : yes
         parallel program mode         : yes
         Timeout                       : 200
         StabDelay                     : 100
         CmdexeDelay                   : 25
         SyncLoops                     : 32
         ByteDelay                     : 0
         PollIndex                     : 3
         PollValue                     : 0x53
         Memory Detail                 :

                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           eeprom        65    20     4    0 no       1024    4      0  3600  3600 0xff 0xff
           flash         65     6   128    0 yes     32768  128    256  4500  4500 0xff 0xff
           lfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           hfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           efuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           lock           0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           calibration    0     0     0    0 no          1    0      0     0     0 0x00 0x00
           signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00

         Programmer Type : STK500
         Description     : Atmel STK500 Version 1.x firmware
         Hardware Version: 2
         Firmware Version: 1.18
         Topcard         : Unknown
         Vtarget         : 0.0 V
         Varef           : 0.0 V
         Oscillator      : Off
         SCK period      : 0.1 us

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.02s

avrdude: Device signature = 0x1e950f
avrdude: NOTE: "flash" memory has been specified, an erase cycle will be performed
         To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: reading input file "C:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\arduino\avr/bootloaders/optiboot/optiboot_atmega328.hex"
avrdude: writing flash (32768 bytes):

Writing | ################################################## | 100% 0.00s

avrdude: 32768 bytes of flash written
avrdude: verifying flash memory against C:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\arduino\avr/bootloaders/optiboot/optiboot_atmega328.hex:
avrdude: load data flash data from input file C:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\arduino\avr/bootloaders/optiboot/optiboot_atmega328.hex:
avrdude: input file C:\Users\James\Desktop\RPi Openhab\arduino-1.6.7-windows\hardware\arduino\avr/bootloaders/optiboot/optiboot_atmega328.hex contains 32768 bytes
avrdude: reading on-chip flash data:

Reading | ################################################## | 100% -0.00s

avrdude: verifying ...
avrdude: 32768 bytes of flash verified
avrdude: reading input file "0x0F"
avrdude: writing lock (1 bytes):

Writing | ################################################## | 100% 0.02s

avrdude: 1 bytes of lock written
avrdude: verifying lock memory against 0x0F:
avrdude: load data lock data from input file 0x0F:
avrdude: input file 0x0F contains 1 bytes
avrdude: reading on-chip lock data:

Reading | ################################################## | 100% 0.01s

avrdude: verifying ...
avrdude: 1 bytes of lock verified

avrdude done.  Thank you.

Ok so that may be the problem then! Let me solder it the right way and see if that helps otherwise I'm going to create a bare bones slim mode as suggested

edit to confirm the positive leg of the capacitor goes to the positive marked plus sign hole on the board?