bs2 "hangs up"
I have a project which utilizes the melexis 90614 infrared thermometer, the ds1620 thermometer·chip and a CdS photocell.· A 433 MHz transmitter allows wireless capability. data is collected to Plx-daq
All components are wired as recommended by parallax literature (with any caps and resistors as specified).
Currently, I am using a benchtop regulated power supply (inside) with about 10 feet of wire to supply the equipment (which is outside) at 9 volts, 500mamps. All components are connect to a bs2 carrier (not super carrier) board.
Everything works great for about 48 to 72 hours, than the system "hangs up" and I have to reset by either
cutting and restarting power (if running wireless) or disconnecting and reconnecting Plx-daq (if the serial cable is connected).·
I thought initially it was a problem related to having the serial cable connected, however, the same thing happens with the cable disconnected with the data being sent via wireless transmitter.
Also, I initially had a tsl230 chip to evaluate ambient light.· I had more frequent episodes and initially thought it was related either the tsl230 chip or the CNT command... I have removed this from the system and still have issues.
So, my questions are as follows:
What am I doing wrong? would a super carrier board help?
Is there a way to automatically or periodically reset the system to avoid a persistent hang up?
Can I use another BS2 to monitor and reset the system if needed ?
I would like to use this remotely and relatively unattended, so I would like some way of having the system restart or be restarted should it hang up.
Thanks for any suggestions
-Frank
·
All components are wired as recommended by parallax literature (with any caps and resistors as specified).
Currently, I am using a benchtop regulated power supply (inside) with about 10 feet of wire to supply the equipment (which is outside) at 9 volts, 500mamps. All components are connect to a bs2 carrier (not super carrier) board.
Everything works great for about 48 to 72 hours, than the system "hangs up" and I have to reset by either
cutting and restarting power (if running wireless) or disconnecting and reconnecting Plx-daq (if the serial cable is connected).·
I thought initially it was a problem related to having the serial cable connected, however, the same thing happens with the cable disconnected with the data being sent via wireless transmitter.
Also, I initially had a tsl230 chip to evaluate ambient light.· I had more frequent episodes and initially thought it was related either the tsl230 chip or the CNT command... I have removed this from the system and still have issues.
So, my questions are as follows:
What am I doing wrong? would a super carrier board help?
Is there a way to automatically or periodically reset the system to avoid a persistent hang up?
Can I use another BS2 to monitor and reset the system if needed ?
I would like to use this remotely and relatively unattended, so I would like some way of having the system restart or be restarted should it hang up.
Thanks for any suggestions
-Frank
·
Comments
Programming wise, if you use a SERIN and the data never arrives, the program will wait forever. Or, if you are waiting for a specific set of characters and they never arrive, the system will appear to hang.
If your serial connection isn't configured with the capacitors, as in later versions, the PC serial port can hold the Stamp in reset under certain conditions.
Can you show us your code?
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Tom Sisk
http://www.siskconsult.com
·
Thanks for your input.· I am assuming the voltage at the stamp has held at 5 volts, but I don't really have a way to monitor it continuously.· I could switch power supplies and see·what happens.·
I've attached the code as well.
Fsb
the program will eventually timeout and you can recover.
What I'm thinking is that for some reason the temp chip either doesn't respond at all or only partially responds which will leave the Stamp waiting indefinitely.
getTemperature: 'SECOND SUBROUTINE: IR temperature sensor
SEROUT Sensor,baud,[noparse][[/noparse]0,"!TEMR",xslave,$07]
SERIN Sensor,baud,[noparse][[/noparse]tempL,tempH]
GOTO convertTemperatures
Cheers,
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Tom Sisk
http://www.siskconsult.com
·
I have added a diode and a cap as suggested
I have modified the serin command as suggested.
We'll see what happens!
Thanks again
fsb
Everything works great. No problems for two weeks.·
fsb