Auto Boot SIM808 GSM/GPS Shield
link 2017-10-30 17:01:38 3429 Views3 Replies I try to autostart the DFRobot SIM808 shield (with UNO) without having to push the "boot" button manually.
The documentation says it can be done with pin 12. But all my attempts did not work.
I tried the power up/down method from the DFRobot library:
sim808.powerUpDown(PIN_PWR);
Also this did not work:
digitalWrite(12,HIGH);
delay(3000);
digitalWrite(12,LOW);
delay(500);
Do I have to solder / jumper anything?
Thanks for your help.
The documentation says it can be done with pin 12. But all my attempts did not work.
I tried the power up/down method from the DFRobot library:
sim808.powerUpDown(PIN_PWR);
Also this did not work:
digitalWrite(12,HIGH);
delay(3000);
digitalWrite(12,LOW);
delay(500);
Do I have to solder / jumper anything?
Thanks for your help.
2017-11-03 16:16:10 OK sorry I figured it out now. Your hint "set as output" did the trick with pin 12.
#define PIN_PWR 12
void setup(){
Serial.begin(9600);
Serial.println("Power up GPS/GSM modem");
// switch pin mode to output
pinMode(PIN_PWR, OUTPUT);
sim808.powerUpDown(PIN_PWR);
...
Thank you very much for the help
link
#define PIN_PWR 12
void setup(){
Serial.begin(9600);
Serial.println("Power up GPS/GSM modem");
// switch pin mode to output
pinMode(PIN_PWR, OUTPUT);
sim808.powerUpDown(PIN_PWR);
...
Thank you very much for the help
link 2017-11-03 16:10:12 Thanks for your reply. Pin 9 did also not work. I tried now all digital pins using the sim808.powerUpDown(9); function without success 
link
link 2017-10-31 19:05:40 I stand to be corrected, but I believe you may need to use pin 9, not 12...(Set as an Output) mtthwlws
mtthwlws 