This is a Bluetooth Low Energy (Bluetooth 4.0) Shield for Arduino compatible boards. A switch allows selection between 3.3V and 5V boards. The serial data can be connected to digital pins D0 to D7 via jumpers. Note that Bluetooth 4.0 is a relatively new standard and not a lot of devices have support. The new iPhones and some Android devices have Bluetooth 4.0 support.
|PCB size||56.0mm X 44.7mm X 1.6mm|
|Operating level||3.3V and 5V|
|Indicators||PWR and Status|
|Power supply voltage||1.65||3.3||3.3||VDC|
|Working current (VCC=3.3V)||-||50||-||mA|
You can use jumpers to connect TXD and RXD pins of HM-10 module to D0~7 of Arduino.
When connecting in the following way, BLE shield is to connect and communicate with hardware UART of chip Atmega328 on the board.
When connecting in the following way, BLE shield is to communicate with chip Atmega8U2 or FT232RLon the board. They are connected to PC via USB cable, when connecting in this way, serial software of PC can be used to control or configure HM-10 module.
Apart from the two ways above, you can also connect TXD and RXD to pins D2 ~ 7 and use a soft serial library to control BLE shield.
When switching to 3.3V, BLE shield can communicate with boards of 3.3V operating level, such as Arduino DUE; when switching to 5V, BLE shield can communicate with boards of 5V operating level, such as Arduino UNO.
When switching, the power supply voltage of V pin at the electronic brick interface will also change accordingly. That is to say, voltage of V pin is 3.3V when switching to 3.3V and 5V when switching to 5V.
3.3V power supply indicator of the shield: When the power supply is normal, PWR indicator is normally ON.
Bluetooth connection status indicator: When the Bluetooth is under standby status, Status indicator flashes at pulse time of 500ms (Status indicator can be modified as OFF under standby status via AT commands); When the Bluetooth is under connection status, Status indicator is normally ON.