Hi,
im working on a home project to detect motion. Im using motion sensor pir hc-sr501 and DFRobot SIM800C shield. I`m wondering, how exactly this shield is powered. It doesnt have any external inputs for power supply. It goes fom Arduino Uno, but which pins? There are some pins i shouldnt use?
Link to the shield: SIM800C_GSM_GPRS_Shield_V2.0_SKU_TEL0089-DFRobot
Hi,
im working on a home project to detect motion. Im using motion sensor pir hc-sr501 and DFRobot SIM800C shield. I`m wondering, how exactly this shield is powered. It doesnt have any external inputs for power supply. It goes fom Arduino Uno, but which pins? There are some pins i shouldnt use?
Link to the shield: SIM800C_GSM_GPRS_Shield_V2.0_SKU_TEL0089-DFRobot
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As the web page you linked to states:
Caution: Since GSM is impulse type transmitting power, and the average current is very low, but the instantaneous current can reach more than 1.5A, so the external power supply is used in the use of GSM expansion board. USB port can only provide 5V@500mA, which cannot meet output of instantaneous power supply.
So why don't you ask the manufacturer where the power connector is?
Dannable i did, still waiting for an answer and thought i would get some here. And i`m using 9V 2A external power supply connected to Arduino Uno, but dont know how to connect power directly to the shield. Anyway thanks for answers.
Have you looked at the schematic of the board; it can be found in github (GitHub - Arduinolibrary/DFRobot_SIM800C_GSM_Shield). The board is powered from the Vin pin. So you power your Uno from the barrel which is connected (via a diode) to the Vin pin on the Uno which will than power the shield.