Raspberry Pi Model B
GEEETECH Arduino GPRS Shield V1.0
(bought from: bit.ly/1G0KYR7)
^ Similar somewhat to:
Seeed's GPRS Shield V1.0 | Link: seeedstudio.com/wiki/GPRS_Shield_V1.0
(has more information and schematics at the bottom, visually looks the same)
Some questions about what and how should i use:
- Serial Port Select: SW / HW ?
- Power Select: Xduino / Ext ?
- GND: where to connect the ground ?
- SIM900 UART (2V8) - should i use the direct connection ?
(^ tried with some success, but not sure how safe it is)
(jumper should be placed in the middle, Ext. 5VDC from the power jack)
How to connect and set this up?
I've found a topic with some information, but i didn't understand the bottom line.
"..The SIM900 GSM / GPRS Shield is installed the voltage level converter,you can connect SIM900 GSM / GPRS Shield and Raspberry Pi (RPi) from serial interface UART directly."
Pi <-> GSM Shield. What-to-Where?
Hope someone can help a newbie here :)
Turning off the UART functioning as a serial console:
I've made the necessary changes for using the serial port (ttyAMA0)
by editing '/boot/cmdline.txt' and '/etc/inittab'.
Confirmed that Pi's UART is working by connecting together TX/RX Pins (GPIO 14/15)
and using minicom to type and receive what I've typed.