Hi There,

I’ve just purchased the 200221 module board from Amazon.it and would appreciate a quick hint for wiring the device to Arduino and Raspberry Pi GPIO.

The kit includes 4 wires and one JUMPER, and searching Amazon reviews it looks like:

– GND to Arduino GND
– RXD to Arduino TX
– TXD to Arduino RX
– VCMU (=VDD in your leaflet) to Arduino +5V for matching Arduino TTL Voltage Level

Please confirm.

Also, the VIN (power input) pin can be fed with 5V power from Arduino: please confirm.

If affirmative, can the JUMPER be used for shorting 1 of 2 VIN pins with 1 of 2 VCMU pins, in order to have only one 5V wire from Arduino feeding both VIN and VCMU on the GSM board?

Regarding Raspebrry Pi wiring, can be VIN connected to external 5V supply while VCMU is wired to the PI 3.3V pin in order to match PI input level? Would this work?

Thank you in advance for your support

BR

Marco

Thank you very much for both confirmations: the VIN+VMCU jumper trick on Arduino but also the Raspberry +3.3 VMCU wiring is quite important for an improved use on the Pi