October 8, 2015 at 09:38AMS AS7000 Optical Biosensor Heart Rate Bracelet
- Transfer
Large and inconvenient for continuous monitoring chest heart rate monitors were replaced by a bracelet type, such as a UWatch UX wristwatch . In the bracelet, the photoelectric sensor reads. The principle of operation is similar to the operation of an optical mouse. Under the influence of blood flow, blood vessels expand and contract in accordance with the rhythm of the heart. The sensor directs the light flux, and depending on the reflection, the pulse is recorded. The computational part of the AMS AS7000 sensor consists of a Cortex M0 core, a DSP (digital signal processor) processor with an integrated photoplethysmography (PPG) algorithm and its subsequent processing into digital HRM and HRV (Heart Rate Variability) .
Sensor
Diagram Specifications:
- MCU - ARM Cortex M0 with 4KB RAM, 32 KB EEPROM
- I / O - 9 GPIO, UART, SPI, I2C
- Analog and optical sensor on the underside
- Hardware sequencer
- Sync Definition
- LED and output contact signaling heartbeat
- Optical filters
- Power Supply - 2.6 - 3.6 V
- Temperature range from -30 to 70 ° C
- There are 18 contacts on the chip
- Size - 6.1 x 4.1 x 1 mm (optical module)
Higher accuracy of pulse measurement can be achieved together, using an external accelerometer, to filter out noise vibrations. Therefore, accuracy during active movement does not suffer, compared with the state of rest. The chip is well suited for fitness bracelets, smart and sports watches, medical sensors for monitoring the health of patients, employees working in the chemical and industrial field.
Two options are available for developers:
AMS AS7000 Demo Kit - a set with a display and a PIC microcontroller, Bluetooth, and a battery. AMS AS7000 is integrated into a small bracelet.
AMS AS7000 Retrofit board - The AS7000 sensor and accelerometer are located on the site to create your complete device.
AMS AS7000 Retrofit board
Both kits come with an SDK and developer documentation. A firmware update program is included in the package. HRM and HRV readings can be downloaded to an Android smartphone or tablet using the Bluetooth interface. The AS7000 sensor is available for sale for $ 6 per unit, with a batch of 1000 units ... The cost of the development board is reported only upon request. For more information, visit the AMS AS7000 page .
