Difference between revisions of "MicroECG"

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This ECG module is easy to use. Data can be transported through either UART or BLE. When the switch on the board is set to the BLE side, data can be transported through BLE. In this case, one can use app on one’s phone to receive the heart rate from this module. When the switch on the board is set to the UART side, data can be transported through UART. In this case, one can control the board with some AT commands.
 
This ECG module is easy to use. Data can be transported through either UART or BLE. When the switch on the board is set to the BLE side, data can be transported through BLE. In this case, one can use app on one’s phone to receive the heart rate from this module. When the switch on the board is set to the UART side, data can be transported through UART. In this case, one can control the board with some AT commands.
  
−
Go shopping [https://www.itead.cc/microecg.html MicroECG (SKU:IM161018001)]
+
Go shopping [https://www.itead.cc/microecg.html MicroECG (SKU:IM161018001) （Coming Soon!）]
  
 
==Specification==
 
==Specification==
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| Input Volt || style="text-align:right" | 3 || style="text-align:right" | 3.3 || style="text-align:right" | 3.6 || VDC
 
| Input Volt || style="text-align:right" | 3 || style="text-align:right" | 3.3 || style="text-align:right" | 3.6 || VDC
 
|-
 
|-
−
| Input voltage VinH || style="text-align:right" | -0.3 || style="text-align:right" | 0 || style="text-align:right" | 0.5 || V
+
| Input voltage VinH || style="text-align:right" |3 || style="text-align:right" | 3.3 || style="text-align:right" | 3.6 || V
 
|-
 
|-
 
| Input voltage VinL || style="text-align:right" | -0.3 || style="text-align:right" | 0 || style="text-align:right" | 0.5 || V
 
| Input voltage VinL || style="text-align:right" | -0.3 || style="text-align:right" | 0 || style="text-align:right" | 0.5 || V
−
|-
 
−
| Charger Current || style="text-align:right" |  || style="text-align:right" |  || style="text-align:right" | 500 || mA
 
 
|-
 
|-
 
| Baud rate || style="text-align:right" |  || style="text-align:right" | 9600 || style="text-align:right" |  || bps
 
| Baud rate || style="text-align:right" |  || style="text-align:right" | 9600 || style="text-align:right" |  || bps
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==Hardware==
 
==Hardware==
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[[File:BL18 ECG Maven hardware.jpg|600px]]
+
[[File:MicroECG-Hardware-1.jpg|400px]]
 +
 
 +
[[File:MicroECG-Hardware-2.jpg|400px]]
  
 
{| class="wikitable"
 
{| class="wikitable"
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| No. || Pin Name
 
| No. || Pin Name
 
|-
 
|-
−
| 1 || TXD(P0.12)
+
| 1 || 3V3
 
|-
 
|-
−
| 2 || RXD(P0.11)
+
| 2 || SWDCLK
 
|-
 
|-
−
| 3 || 5V
+
| 3 || SWDIO/RST
 
|-
 
|-
−
| 4 || GND
+
| 4 || TXD(P0.12)
−
|}
+
−
{| class="wikitable"
+
−
! scope="col" colspan=4| J5
+
 
|-
 
|-
−
| No. || Pin Name || Pin Name || No.
+
| 5 || RXD(P0.11)
−
|-
+
−
| 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
+
−
|}
+
−
{| class="wikitable"
+
−
! scope="col"  colspan=4 | J6
+
 
|-
 
|-
−
| No. || Pin Name || Pin Name || No.
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| 6 || GND
 
|-
 
|-
−
| 1 || 3V3 || GND || 2
+
| 7 || GND
 
|-
 
|-
−
| 3 || P0.20 || P0.19 || 4
+
| 8 || LA
 
|-
 
|-
−
| 5 || P0.18 || P0.17 || 6
+
| 9 || RA
 
|-
 
|-
−
| 7 || P0.16 || P0.15 || 8
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| 10 || RLD
 
|-
 
|-
−
| 9 || P0.14 || P0.13 || 10
+
| 11 || NC
 
|-
 
|-
−
| 11 || P0.10 || P0.09 || 12
+
| 12 || NC
 
|}
 
|}
  
 
==Interface Functions==
 
==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.
+
*SWDCLK: SWD interface clock line
−
*J5, J6 GPIO ports: general GPIO port, users can self-define the functions.
+
*SWDIO/RST: SWD interface data line
−
*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.
+
*RXD/TXD: serial, support AT command
−
*USB: users can send and receive data through USB, and power the battery through USB.
+
*LA: left arm signal input pin
−
*Battery Socket: 3.7V lithium battery connector.
+
*RA: right arm signal input pin
−
*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.
+
*RLD: right arm drive feedback output pin
  
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==Usage==
+
1.Power up this module with 3.3V. And use ECG Limb Clamp (IM161025001) and ECG Lead Wire (IM161025002) to clamp your arm.
−
*BLE case
+
−
1.Set the switch on the board to the BLE side.
+
  
−
2.Power on the board with either USB cable or battery.
+
2.Run the BLE app on the phone. Click and turn into the “HRM” mode and then connect to the “ITEAD_BL18_ECG” device.
  
−
3.Put the 3 detectors (red、black、white) on the arms and connect the cable to the board.
+
3.Just wait a while and the heart rate will be displayed.
  
−
4.Run the BLE app on the phone. Click and turn into the “HRM” mode and then connect to the “ITEAD_BL18_ECG” device.
+
[[File:heart_rate_dectect.jpg|400px]]
  
−
5.Just wait a while and the heart rate will be displayed.
 
  
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*UART case
+
AT commands:
−
1. Set the switch on the board to the BLE side.
+
  
−
2. Power on the board with either USB cable or battery.
 
−
 
−
3. Put the 3 detectors (red、black、white) on the arms and connect the cable to the board.
 
−
 
−
4.Connect the Uart interface to another mcu or connect the USB cable to PC.
 
−
 
−
5. Control the board with following AT commands:
 
  
 
1.“AT\r”
 
1.“AT\r”
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2.“ATdataTypeR\r”
 
2.“ATdataTypeR\r”
  
−
This command is a string and used to set the data type to row data.  
+
This command is a string and used to set the data type to row data.
−
 
+
 
When the command runs successfully , "Type:R\nOK\r\n" will be returned.
 
When the command runs successfully , "Type:R\nOK\r\n" will be returned.
  
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This command is a string and used to set the data type to heart rate.  
 
This command is a string and used to set the data type to heart rate.  
−
 
+
 
 
When this command runs successfully, "Type:H\nOK\r\n" will be returned.
 
When this command runs successfully, "Type:H\nOK\r\n" will be returned.
−
 
+
 
 
This command can not run successfully when the “ATstartRead\r” is running.
 
This command can not run successfully when the “ATstartRead\r” is running.
  
 
4.“ATdataType?\r”
 
4.“ATdataType?\r”
−
 
 
This command is a string and used to get the current data type.  
 
This command is a string and used to get the current data type.  
  
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When the hardware connection of ECG cable is not ok, “ERROR\r\n” wiil be returned.
 
When the hardware connection of ECG cable is not ok, “ERROR\r\n” wiil be returned.
  
−
When the hardware is ok, “OK\r\n” will be returned firstly, and then the data will be transported continuously as soon as the data itself is updated. Both row data and heart rate are 8-bit hex values.
+
When the hardware is ok, “OK\r\n” will be returned firstly, and then the data will be transported continuously as soon as the data itself is updated.
  
 
7.“ATstopRead\r”
 
7.“ATstopRead\r”
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==Useful Link==
 
==Useful Link==
 +
[[:File:IM161018001-MicroECG-PCBVIEW.pdf]]
 +
 +
[[:File:IM161018001-MicroECG-schematic.pdf]]
 +
 +
[[:File:IM161018001-MicroECG-dimension.pdf]]
 +
 +
[[:File:nRF51822_PS_v3.1.pdf]]
  
 
[http://dl.itead.cc/BL18_ECG_Maven/nRFToolbox.apk nRFToolbox.apk]
 
[http://dl.itead.cc/BL18_ECG_Maven/nRFToolbox.apk nRFToolbox.apk]
 +
 +
[https://www.itead.cc/ecg-limb-clamp.html ECG Limb Clamp]
 +
 +
[https://www.itead.cc/ecg-lead-wire.html ECG Lead Wire]

Latest revision as of 09:30, 21 February 2017

Overview

MicroECG 03.jpg

MicroECG is an ECG monitoring module based on nRF51822 BLE chip and BL1860 ECG chip, which can transport heart information through either UART or BLE. 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.

The heart information includes row data and the heart rate. The row data is the result of ADC detection, representing the strength of heart beat. The row data can be used to draw ECG directly. And the heart rate is the result of calculation with the row data.

This ECG module is easy to use. Data can be transported through either UART or BLE. When the switch on the board is set to the BLE side, data can be transported through BLE. In this case, one can use app on one’s phone to receive the heart rate from this module. When the switch on the board is set to the UART side, data can be transported through UART. In this case, one can control the board with some AT commands.

Go shopping MicroECG (SKU:IM161018001) （Coming Soon!）

Specification

PCB Size 22mm X 26mm X 1.6mm
Input Voltage (vcc) 3.3V
Microprocessor nRF51822
Interface UART, BLE

Electrical Characteristics

Parameter Min Typical Max Unit
Input Volt 3 3.3 3.6 VDC
Input voltage VinH 3 3.3 3.6 V
Input voltage VinL -0.3 0 0.5 V
Baud rate 9600 bps

Hardware

MicroECG-Hardware-1.jpg

MicroECG-Hardware-2.jpg

J7
No. Pin Name
1 3V3
2 SWDCLK
3 SWDIO/RST
4 TXD(P0.12)
5 RXD(P0.11)
6 GND
7 GND
8 LA
9 RA
10 RLD
11 NC
12 NC

Interface Functions

  • SWDCLK: SWD interface clock line
  • SWDIO/RST: SWD interface data line
  • RXD/TXD: serial, support AT command
  • LA: left arm signal input pin
  • RA: right arm signal input pin
  • RLD: right arm drive feedback output pin

1.Power up this module with 3.3V. And use ECG Limb Clamp (IM161025001) and ECG Lead Wire (IM161025002) to clamp your arm.

2.Run the BLE app on the phone. Click and turn into the “HRM” mode and then connect to the “ITEAD_BL18_ECG” device.

3.Just wait a while and the heart rate will be displayed.

Heart rate dectect.jpg


AT commands:


1.“AT\r”

This command is a string and used to test the UART connection.

When the UART is working , “OK\r\n” will be returned.

2.“ATdataTypeR\r”

This command is a string and used to set the data type to row data.

When the command runs successfully , "Type:R\nOK\r\n" will be returned.

This command can not run successfully when the “ATstartRead\r” is running.

3.“ATdataTypeH\r”

This command is a string and used to set the data type to heart rate.

When this command runs successfully, "Type:H\nOK\r\n" will be returned.

This command can not run successfully when the “ATstartRead\r” is running.

4.“ATdataType?\r” This command is a string and used to get the current data type.

When this command runs successfully, and the current data type is row data, then "Type:R\nOK\r\n" will be returned.

When this command runs successfully, and the current data type is heart rate, then "Type:H\nOK\r\n" will be returned.

This command can not run successfully when the “ATstartRead\r” is running.

5.“ATtestCon\r”

This command is a string and used to test the connection of the ECG cable.

When the hardware connection of ECG cable is ok, “OK\r\n” will be returned.

When the hardware connection of ECG cable is not ok, “ERROR\r\n” wii be returned.

6.“ATstartRead\r”

This command is a string and used to get the data from UART.

When the hardware connection of ECG cable is not ok, “ERROR\r\n” wiil be returned.

When the hardware is ok, “OK\r\n” will be returned firstly, and then the data will be transported continuously as soon as the data itself is updated.

7.“ATstopRead\r”

This command is a string and used to stop the reading action through UART.

When this command runs successfully, “OK\n\r” will be returned and the reading action will stop.

Useful Link

File:IM161018001-MicroECG-PCBVIEW.pdf

File:IM161018001-MicroECG-schematic.pdf

File:IM161018001-MicroECG-dimension.pdf

File:nRF51822_PS_v3.1.pdf

nRFToolbox.apk

ECG Limb Clamp

ECG Lead Wire

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