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Added section for Arduino pin usages #36

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14 changes: 13 additions & 1 deletion docs/Seeeduino_GPRS.md
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Expand Up @@ -107,7 +107,19 @@ Operating Status Indication
|64ms on/3000ms off|SIM800H registered the network|
|64ms on/300ms off|SIM800H communication is established|


## Arduino pin usage

|Pin number|Usage|
|----------|--------|
|7|SIM800H RX|
|8|SIM800H TX|
|9|SIM800H Power|
|11|SIM800H DTR|
|12|SIM800H Status (See below)|
|13|Builtin LED|

Note; Pin 12 only measures around 0.65V when module is on. Use analogRead on port A11, a number above 100 indicates the module is powered on. Port A11 uses the same physical pin as pin 12 but for analog reads.

## Install the Driver

First of all, you need to:
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