I'm currently having problem when using an Arduino Uno, GSM-shield and LCD keypad shield. I want to connect different sensors that use the 5V, ground and one of the six analog pins on the Arduino Uno. Everything connects fine and the lcd prints what I want. But when I, via the GSM shield, want to send a POST request to a server, the serial monitor prints the following message instead of the confirmation the POST request was successfully recieved:
NORMAL POWER DOWN
And that is only when the POST request is meant to be sent. It has to be something with the power given to the GSM shield or something completely else. If someone has any idea why this is happening, feel free to answer :)
EDIT: The LCD-shield I'm using: http://www.dfrobot.com/wiki/index.php/Arduino_LCD_KeyPad_Shield_(SKU:_DFR0009)
Btw, everything works fine without the LCD-shield and only with the Arduino Uno, Arduino GSM-shield and one of the sensors...