![]() Typing AT on the line mode gets an OK reply from HM10. This allows sending AT commands as a single packet. Under Serial port select the COM port of USB-TTL, Baud Rate 9600, 8N1 So Putty terminal cannot be used.We use COOLTERM terminal in LINE MODE. The HM10 module do not wait for a Carriage Return. We require a TERMINAL software to test AT commands. HM10 can be supplied power 5v, as there is on board 3.3v regulator.Ĭonnect the USB –TTL to PC and note the COM port allotted. A 1k in series and 2k2 across to Gnd is a simple level shifter. Rx of HM10 to be connected through a level shifter to Tx of USB-TTL. Tx of HM10 can be connected directly to Rx of USB-TTL. RXD: serial interface, receiving terminal.įor testing AT Commands we need an USB-TTL module built on CP2102 ic.Ĭonnection between HM10 and USB-TTL is shown below :.TXD: serial interface, transmitting terminal.VCC: positive pole of the power source.BRK: break connect, it means breaking the Bluetooth connection, generally keep it unconnected.STATE: state test pins, connected to an internal LED, generally keep it unconnected.The Bluetooth 4.0 HM-10 is basically a breakout board for cc2541, it broke out the LED pins, RX/TX and also adding the voltage regulator that regular 5v to 3.3 v.Ĭlones available in market have on board only single crystal and the Firmware of clones support limited AT commands.Clones are mostly named as MLT-BT05 It is fully configurable by a rich and well documented AT command-set and allows transparent data communication via serial UART (default baud rate 9600 bps). You can use it simply for a serial port replacement to establish connection between MCU & your embedded project The module is designed by using the Texas Instruments CC2541 Bluetooth low energy(BLE) System on Chip (SoC). This module is used for establishing wireless data communication. ![]() The HM-10 BLE Wireless Module-Original is a readily available Bluetooth 4.0 module, which can configure as either Master or slave. ![]()
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