Muscle signal sensor EMG Sensor for Arduino

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Muscle signal sensor EMG Sensor for Arduino

AD8232 module ECG/bioelectric signal acquisition development module Arduino compatible

Information: http://duinopeak.com/wiki/index.php?title=AD8232_Single_Lead_Heart_Rate_Monitor_AD8232%E5%8D%95%E5%AF%BC%E8%81%94%E5%BF%83%E7%8E%87% E6%B5%8B%E9%87%8F

AD8232 is an integrated front end, suitable for signalling cardiac bioelectrical signals
No. conditioning for heart rate monitoring.

An integrated signal conditioning module for ECG and other bioelectric measurement applications. The device is designed to extract, amplify and filter weak bioelectric signals in the presence of noise caused by movement or remote electrode placement. This design enables an ultra-low power analog-to-digital converter (ADC) or embedded microcontroller to easily collect the output signal.

AD8232 uses a two-pole high-pass filter to eliminate motion artifacts and electrode half-cell potential. The filter is tightly coupled with the instrumentation amplifier structure, which can realize single-stage high-gain and high-pass filtering, thereby saving space and cost.

AD8232 uses an unused constrained operational amplifier to create a three-pole low-pass filter, eliminating additional noise. The user can select the cutoff frequency of all filters to meet the needs of different types of applications.

In order to improve the common-mode rejection performance of the system line frequency and other undesirable interferences, the AD8232 has a built-in amplifier for driven lead applications such as right-side drive (RLD).

The AD8232 includes a fast recovery function, which can reduce the long set-up tail of the high-pass filter. If there is a sudden change in the amplifier rail voltage (such as a lead-off situation), the AD8232 will automatically adjust to a higher filter cut-off state. This function allows the AD8232 to achieve rapid recovery, so that a valid measurement value can be obtained as soon as possible after the lead is connected to the electrode of the measurement object.

The rated temperature range for guaranteed performance is 0 ℃ to 70 ℃, and the operating temperature range is -40 ℃ to +85 ℃.


Fitness and exercise heart rate monitoring
Portable ECG
Remote health monitoring
Gaming peripherals
Bioelectric signal acquisition
Pin number Pin name Description
1 HPDRIVE high-pass driver output. HPDRIVE should be connected to the capacitor in the first high-pass filter.
AD8232 drives this pin to keep HPSENSE at the same level as the reference voltage.
2 +IN The positive input terminal of the instrumentation amplifier. +IN is usually connected to the left arm (LA) electrode.
3 −IN The negative input terminal of the instrumentation amplifier. −IN is usually connected to the right arm (RA) electrode.
4 RLDFB Right leg drive feedback input terminal. RLDFB is the feedback pin of the right leg drive circuit.
5 RLD Right leg drive output terminal. The drive electrode (usually the right leg) should be connected to the RLD pin.
6 SW Fast recovery switch pin. This pin should be connected to the output of the second high-pass filter.
7 OPAMP+ Operational amplifier non-inverting input terminal.
8 REFOUT Reference voltage buffer output terminal. The instrumentation amplifier output is referenced to this potential.
REFOUT should be used as a virtual ground at any point in the circuit where a reference signal is needed.
9 OPAMP− The inverting input terminal of the operational amplifier.
10 OUT Operational amplifier output terminal. This output provides a conditioned heart rate signal.
OUT can be connected to the input terminal of the ADC.
11 LOD− The lead falls off the output of the comparator. In the DC lead-off detection mode, when the −IN electrode is disconnected,
LOD− is in a high level state, otherwise it is in a low level state. In the AC lead-off detection mode, LOD− is always in a low state.
The lead falls off the output of the comparator. In the DC lead-off detection mode, when the +IN electrode is disconnected, LOD+ is in a high level state,
Otherwise, it is in a low level state. In the AC lead-off detection mode, when the −IN or +IN electrode is disconnected, the LOD+ is at a high level.
When these two electrodes are connected, they are in a low level state.
12 LOD+
13 SDN Shutdown control input terminal. Drive SDN to a low level to enter a low-power shutdown mode.
14 AC/DC lead off mode control input terminal. For the DC lead-off mode, the AC/DC pin should be driven to a low level.
For the AC lead-off mode, the AC/DC pin should be driven to a high level.
15 FR Fast recovery control input. Driving FR to a high level enables the fast recovery mode; otherwise, it should be driven to a low level.
16 GND Power ground.
17 +VS Power supply pin.
18 REFIN Reference voltage buffer input terminal. REFIN (high impedance input pin) can be used to set the level of the reference voltage buffer.
19 IAOUT Instrumentation amplifier output pin.
20 HPSENSE The high-pass detection input of the instrumentation amplifier.
HPSENSE should be connected to the R and C nodes that set the corner frequency of the DC blocking circuit.
EP Exposed Pad. The exposed pad should be connected to GND or left unconnected.

Description: The AD8232 SparkFun Single Lead Heart Rate Monitor is a cost-effective board used to measure the electrical activity of the heart. This electrical activity can be charted as an ECG or Electrocardiogram and output as an analog reading. ECGs can be extremely noisy, the AD8232 Single Lead Heart Rate Monitor acts as an op amp to help obtain a clear signal from the PR and QT Intervals easily.

The AD8232 is an integrated signal conditioning block for ECG and other biopotential measurement applications. It is designed to extract, amplify, and filter small biopotential signals in the presence of noisy conditions, such as those created by motion or remote electrode placement.

The AD8232 Heart Rate Monitor breaks out nine connections from the IC that you can solder pins, wires, or other connectors to. SDN, LO+, LO-, OUTPUT, 3.3V, GND provide essential pins for operating this monitor with an Arduino or other development board. Also provided on this board are RA (Right Arm), LA (Left Arm), and RL (Right Leg) pins to attach and use your own custom sensors. Additionally, there is an LED indicator light that will pulsate to the rhythm of a heart beat. Biomedical Sensor Pads and Sensor Cable are required to use the heart monitor and can be found in the Recommended Products section below.

Note: This product is NOT a medical device and is not intended to be used as such or as an accessory to such nor diagnose or treat any conditions.

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