HM-10 Bluetooth Module

25 September 2020 - 0 Comments

HM-10 Bluetooth Module

HM-10 Bluetooth Module Pinout

The HM-10 is a readily available Bluetooth 4.0 module used for establishing wireless data communication. The module is designed by using the Texas Instruments CC2540 or CC2541 Bluetooth low energy (BLE) System on Chip (SoC) but design and firmware originated from the Jinan Huamao Technology Company.

HM-10 Pinout Configuration

HM-10 is a 34-pin module. In them most are not compulsory use pins. We only need four pins of all 34 to establish a communication. We will describe the function of each pin below.

Pin Number	Pin Name	Description
1	UART_TX	UART interface-Transmit
2	UART_RX	UART interface-Receive
3	UART_CTS	UART interface
4	UART_RTS	UART interface
5	NC	No Connection
6	NC	No Connection
7	NC	No Connection
8	NC	No Connection
9	NC	No Connection
10	NC	No Connection
11	RESETB	Reset if low for 100ms
12	VCC	3.3V
13	GND	Ground
14	GND	Ground
15	USB_D-	USB interface
16	NC	No Connection
17	NC	No Connection
18	NC	No Connection
19	NC	No Connection
20	USB_D+	USB interface
21	GND	Ground
22	GND	Ground
23	PIO0	System Key
24	PIO1	System LED
25	PIO2	Programmable input/output line
26	PIO3	Programmable input/output line
27	PIO4	Programmable input/output line
28	PIO5	Programmable input/output line
29	PIO6	Programmable input/output line
30	PIO7	Programmable input/output line
31	PIO8	Programmable input/output line
32	PIO9	Programmable input/output line
33	PIO10	Programmable input/output line
34	PIO11	Programmable input/output line

HM-10 Module Features

BT Version: Bluetooth Specification V4.0
BLE chip - Bluetooth Low Energy consumption
Send and receive no bytes limit.
Working frequency: 2.4GHz ISM band
UART Serial Interface
Full-Speed USB Interface
12 General Purpose Input/output Pins
In-System-Programmable Flash- 128 KB or 256KB
8-KB SRAM
32-kHz Sleep Timer With Capture
Long range: Open space have 100 Meters
Potable size
HM-10 MODULE Specifications
Operating voltage of MODULE: 2.0V – 3.6V
Can operate on LOW voltages
Consumes 235uA on battery backup
Input RF level: 10dBm
Maximum voltage: + 3.9V
Operating temperature: -40ºC to +85ºC
ESD: 750V

Similar Bluetooth Modules

HM-11, HM-01 to HM-09

Where HM-10 MODULE is used?

Module is used where short distance wireless communication is needed. The module is used for wireless communications of less than 100 meters.
The module is preferred where power consumption is issue. HM-10 Bluetooth Module is designed by BLE chip so it consumes very less power to function. So the module can be used on mobile systems.
The module is cheap so it can be installed in low cost systems.
The module uses UART communication and so it can be interfaced with almost all controllers or processors.

How to use HM-10 MODULE?

As mentioned earlier, the communication with this HM-10 BLE module is done through UART interface or RS232 Interface. The data is sent to the module or received from the module though UART interface. A typical HM-10 module interfacing is shown below.

The module is typically connected to +3.3V standard power supply. It can work on +3.6V regulated power and any higher voltage may damage the module. The UART interface is established as shown in figure. All you need to do is connect RX of module to RX of controller and TX is connected to TX of controller. The ground of controller and module must be connected for voltage reference.

How to Use HM10 Bluetooth Module

The communication between controller and module is really complex. We will use libraries written for specific controller or boards to communicate with this module. You can download libraries for controller or module through their websites. Using these libraries makes the communication easy. All you need to do is download these libraries and call them in programs. Once the header file is included, you can use simple commands in the program to tell the controller to send or receive data. The controller sends the data to module through UART Interface based on protocol setup in libraries. The module sends this data to receiver through wireless Bluetooth. If the module receives any data, it will transmit it to controller through UART serial communication.

This way we can use HM-10 module to establish Bluetooth wireless communication.