Hi,
Thanks but I don't quite understand how that works, if my device hangs on the reads for the sensors, is there any way I can have it skip over that part of the code?

Many thanks

Hi,
I am unsure of how to use this function, the documentation seems to be almost non existent.  I would like to set a timeout when I read one of my sensors that is on an i2c bus incase it gets unplugged so doesn't hang the arduino.

Code:

float hum1 = (SHT2x.GetHumidity());
 float temp1 = (SHT2x.GetTemperature());

If anyone knows how to put that within a setTimeout function I will be very appreciative.

Very impressive.  Nice to know pervasive are helpful.
Are you planning on releasing your code? or at least some documentation on how to get them working?
Thanks

Oh ok, that is fair enough.  Please post on how you get on.

The problem is they are quite difficult to get hold of and densitron their main distributers are D****

Hi, no update sorry, we ended up going with a regular LCD due to cost, I do have a 5" pervasive display hooked up to a pic dev board though but havent had much of a chance to play with it.

Hi, yes I do know about hardware multiplexors, the problem is that the device is based on a custom PCB that cant be modified so I need a soft solution to this.

Unfortunately I can't, there has been a system designed already with custom PCBs that need the ability to check if sensors are actually connected or not.

The ports.h and SHT21.h creates a series of simulated i2c buses that run on one analogue pin and one digital pin.  They are not picked up by the i2c scanner.  This allows me to use 8 sht21 sensors which I would not normally be able to do on the same bus as they all have the same fixed address.

Hi,
I used this a while ago, if I remember right just use the function lcd.scrollDisplayLeft();

I am using Jeelabs Ports.h in conjunction with an SHT21Ports.h library.  This allows me to have 8 SHT21 sensors.  However I need to have the ability to check if the 7 sensors on virtual i2c busses are actually connected.  I am stumped, the i2c scanners that are around will show that the soft ports are always present even if nothing is connected to them.  Please help.

The libraries are here http://pastebin.com/u/mrjonny2

Hi,
I would like to use the

Code:

DeviceI2C::isPresent

function from Ports.h in SHT21Ports.h, or if someone knows how to get it to check to see if the sensors are present (I have already tried the I2C scanners it picks up the soft ports whether or not the device is connected)  I need a way of checking to see if the devices are connected.  I really need a way to check if the sensors have been unplugged.

The libraries are http://pastebin.com/u/mrjonny2

It is actually a socket for a Wiz820io that I am using for programming as well.

Hi, I am stumped I am trying to program a 2560V on a custom PCB and getting errors from avrdude, I am not sure if it is a design error on my PCB or something wrong. So if someone could confirm everything is ok I would be very grateful.

https://www.dropbox.com/s/0ld57kyslr4ajhs/Schematic.pdf

Code:

elvyn-249-88:~ jonny_flowers$ avrdude -p m2560 -c avrispmkii -P usb -B 1 -vvv

avrdude: Version 5.3.1.osxintelhack, compiled on Feb  1 2007 at 22:30:12
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/

         System wide configuration file is "/usr/local/etc/avrdude.conf"
         User configuration file is "/Users/jonny_flowers/.avrduderc"
         User configuration file does not exist or is not a regular file, skipping

         Using Port            : usb
         Using Programmer      : avrispmkii
         Setting bit clk period: 1.0
avrdude: usbdev_open(): Found AVRISP mkII, serno: 000200112693
Using p = 1.00 us for SCK (param = 3)
         AVR Part              : ATMEGA2560
         Chip Erase delay      : 9000 us
         PAGEL                 : PD7
         BS2                   : PA0
         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    10     8    0 no       4096    8      0  9000  9000 0x00 0x00
                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           flash         65     6   256    0 yes    262144  256   1024  4500  4500 0x00 0x00
                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           lfuse          0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           hfuse          0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           efuse          0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           lock           0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           calibration    0     0     0    0 no          1    0      0     0     0 0x00 0x00
                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00

         Programmer Type : STK500V2
         Description     : Atmel AVR ISP mkII
         Programmer Model: AVRISP mkII
         Hardware Version: 1
         Firmware Version: 1.10
         Vtarget         : 3.4 V
         SCK period      : 1.00 us

avrdude: stk500v2_command(): command failed
avrdude: initialization failed, rc=-1
         Double check connections and try again, or use -F to override
         this check.


avrdude done.  Thank you.

Ok so I ran the code and the scan picks up 9 devices,

Code:

I2C scanner. Scanning ...
Found address: 64 (0x40)
Found address: 80 (0x50)
Found address: 81 (0x51)
Found address: 82 (0x52)
Found address: 83 (0x53)
Found address: 84 (0x54)
Found address: 85 (0x55)
Found address: 86 (0x56)
Found address: 87 (0x57)
Done.
Found 9 device(s).

The first one is the hard I2C channel SHT21 and then the second one is an I2C EEPROM chip, then I am guessing the other 7 detected are my soft channels.  but only 3 of the channels have devices connected.