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March 18, 2010
about 5 years ago
Here’s a picture - http://www.janspace.com/b2evolution/blogs/media/Arduino/CELL-1.jpg
Hope you can see it well enough. The center signal wire is soldered to the small pad in the corner, and the shield is soldered to the larger L shaped pad. Might want to use a DVM to ensure they’re not shorted together and that they make it to the connector end ok. Also make sure you have an antenna (CEL-00675) attached to the connector.
Other than that, if you have a valid SIM card and it’s set to use the proper band, should be good to go.
The antenna connection looked a little ratty so I removed it, cleaned up the contacts, re-stripped the wires, soldered it back on. Immediately got ‘11’ instead of ‘8’ when powered up.
Then found the Arduino serial monitor does not send a carriage return. Modified the example as follows:
if( Serial.available( ) > 0)
incoming_char = Serial.read( ); // Get the character coming from the terminal
if( incoming_char == ‘~’ ) // If it’s a tilde…
incoming_char = 0x0D; // …convert to a carriage return
else if( incoming_char == ‘^’ ) // If it’s an up caret…
incoming_char = 0x1A; // …convert to ctrl-Z
cell.print( incoming_char ); // Send the character to the cellular module.
Serial.print( incoming_char ); // Echo it back to the terminal
Swaps a tilde coming in from Arduino for a carriage return, and swaps an up caret for ctrl-Z. Also echos the characters back to the serial monitor.
Works perfectly - I can make calls and send text msgs with no problem. Hope this helps.
…stripped out some of my post above. Referring to termination with a “carriage return”.
I’m also having this problem. Sent AT+SBAND=7 to set the GSM bands for the US, still no change.
The comment in the example sketch says…“*Unless otherwise noted AT commands are ended by pressing the ‘enter’ key.” I assume this means that the AT commands are terminated by a . Does hitting the enter key in the Send box of the Arduino Serial Monitor append a to the entry?
Seems a lot are seeing this problem…it’s just a very expensive coaster right now. Anybody have any suggestions? Sparkfun? Mr. Owens?
No public wish lists :(
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