WIFI SHIELD REV2 for Arduino
WIFI Shield REV2 supports IEEE 802.11b/g/n wireless protocol standard and serial output, which integrates TCP / IP protocol stack internally. It is specifically designed for Arduino boards including Arduino UNO, MEGA and Leonardo, and it supports 3.3V or 5V operation level so it can work with more Arduino-compatible boards.
Micro SD Socket
WIFI module Interface
You can connect pins TXD and RXD on the module to D0~7 of Arduino with a jumper.
When connection is done as below, WIFI shield is communicating with chip atmega328.
When connection is made as below, WIFI shield is communicating with chip atmega8U2 or FT232RL, and if they are connected to PC via USB cable, serial software in PC can be used to control or configure module HM-10.
In addition, pins TXD and RXD can also be connected to D2~7 to control module HM-10 with software serial library.
When switching to 3.3V, WIFI shield can communicate with mainboards with operation level of 3.3V, such as Arduino DUE; when switching to 5V, WIFI shield can communicate with mainboards with operation level of 5V, such as Arduino UNO.
When switching, supply voltage of V pin on the electronic brick interface will also change accordingly. when switching to 3.3V, voltage of V pin is 3.3V and it will be 5V when switching to 5V.
When the switch turns to ‘Normal’, module is powered up but it will not enter transparent transmission mode; when the switch turns to ‘Transparent’, module will enter transparent transmission mode after powering up.
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