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odd issue with Arduino Mega
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rgallant
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odd issue with Arduino Mega
Oct 31, 2012, 07:59 pm
This may be me but here is the situation
I am communicating via the I2C bus to a Devantech SD21 using an Ardunio Mega 2560
If I use the Arduino on board 5 volt and ground everything works ok.
If I try to use 5 volts to the SD21 and simply use the SDA/SCL from the Ardunio the sketch hangs, the 1st time it attempts to end the transmission.
It acts as if the SD21 is not powered by the external power, I did verify that power does exist at the appropriate pins on the SD21.
Am I missing something obvious ? Have noticed this problem with other sketches as well that use the servo library to fire up an R/C ESC.
Any troubleshooting suggestions
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Re: odd issue with Arduino Mega
#1
Oct 31, 2012, 08:06 pm
When you do this
"If I try to use 5 volts to the SD21 and simply use the SDA/SCL from the Ardunio the sketch hangs, the 1st time it attempts to end the transmission. "
are you connecting the 2 grounds together?
Designing & building electrical circuits for over 25 years. Screw Shield for Mega/Due/Uno, Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at my website.
rgallant
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Re: odd issue with Arduino Mega
#2
Oct 31, 2012, 08:56 pm
Hi,
Thanks for the very quick reply
No actually I am not, to connect the grounds, I am assuming the ground on the SD21 will go to ground on the Arduino, does it matter which one ? I am assuming you would go to the ground beside the 5 volt pin ?
CrossRoads
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Re: odd issue with Arduino Mega
#3
Oct 31, 2012, 09:07 pm
Yes. All grounds must connect together. The Gnd on the header is a convenient location.
Designing & building electrical circuits for over 25 years. Screw Shield for Mega/Due/Uno, Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at my website.
rgallant
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Re: odd issue with Arduino Mega
#4
Oct 31, 2012, 09:15 pm
Thanks,
That resolved the problem. I appreciate the assistance.
CrossRoads
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Re: odd issue with Arduino Mega
#5
Oct 31, 2012, 09:18 pm
Glad to help.
Designing & building electrical circuits for over 25 years. Screw Shield for Mega/Due/Uno, Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at my website.
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