BL18 ECG Maven

Overview

BL18 ECG Maven is an ECG monitoring module based on nRF51822 BLE chip and BL1860 ECG chip, which can transport heart information through either UART or BLE. Heart information can be displayed on mobile APP through BLE or be printed through UART. Users can control nRF51822 via AT Commands. Also, they can use the open-source software to develop their own firmware, making it to support more functions.

Specification

PCB_Size	col45mm_X_50mm_X_16mm
Input Voltage (vcc)	5V or 3.7V battery
Microprocessor	nRF51822
Interface	UART，BLE

Electrical Characteristics

Parameter	Min	Typical	Max	Unit
Input Volt.（USB）	4.5	5	5.5	VDC
Battery Volt. Range	3.3	3.7	4.2	VDC
Input voltage VinH	3	3.3	3.6	V
Input voltage VinL	-0.3	0	0.5	V
Charger Current			500	mA
Baud rate		9600		bps

Hardware

J7
No.	Pin Name
1	TXD(P0.12)
2	RXD(P0.11)
3	5V
4	GND

J5
No.	Pin Name	Pin Name	No.
1	5V	GND	2
3	P0.21	P0.22	4
5	P0.23	P0.25	6
7	P0.28	P0.29	8
9	P0.00	P0.04	10
11	P0.06	P0.07	12

J6
No.	Pin Name	Pin Name	No.
1	3V3	GND	2
3	P0.20	P0.19	4
5	P0.18	P0.17	6
7	P0.16	P0.15	8
9	P0.14	P0.13	10
11	P0.10	P0.09	12

Interface Functions

• J7 GPIO port: serial output port, this port also connects to CP2102 USB-to-TTL chip, users can send and receive data through USB.
• J5, J6 GPIO ports: general GPIO port, users can self-define the functions.
• Output Data Configuration Switch: users can select whether to use BLE to transport heart rate data. The serial port always can be used no matter which side you switch to.
• USB: users can send and receive data through USB, and power the battery through USB.
• Battery Socket: 3.7V lithium battery connector.
• Pole Socket：ECG cable interface, detect heart rate by using ECG electrodes to contact human right and left hand skin. Note: LA electrode(black buckle) is attached to left hand, RA electrode(white buckle) is attached to right hand, RLD electrode(red buckle) is attached to right hand.