With the development of Internet of Things technology, wearable product technology has been widely popularized. Among them, wearable health detectors can detect various major physiological indicators of the human body at any time and anywhere, and send alarms when the indicators are abnormal, and transmit the monitoring information wirelessly To a professional device or personal mobile phone. Various wearable health monitors have appeared on the market, including heart rate monitors, blood pressure monitors, fat content testers, sleep monitors, etc. This article mainly introduces the application of CypressPSoCBLE in wearable heart rate monitors.
Heart rate refers to the number of heart beats per unit time. It is an important parameter that reflects whether the heart is working properly. At the same time, heart rate value is also an important indicator to measure the intensity of physical labor and mental labor. Therefore, it is necessary to design a heart rate tester that can be worn at any time, can record, display and store heart rate values ​​for a long time, can communicate with the mobile phone Bluetooth and has strong anti-interference ability, and can alarm the heart rate beyond the normal range. .
When designing heart rate monitor products, you will encounter the following problems:
1. Requires low-power Bluetooth communication and mobile phone for information interaction, timely feedback to the user of the heart rate information of the test, and allows the user to make relevant settings through the mobile phone;
2. You need to use AFE (analog front end) circuit and filter circuit to measure the heart rate signal. The sampling accuracy of AD has a greater impact on the accuracy of the heart rate signal;
3. Need to provide customers with user button interface, such as capacitive touch buttons;
4. Need to provide a segment code LCD liquid crystal display to display the measured heart rate value;
5. Need to achieve low power consumption and extend the standby time of the product, so that it can be powered by button batteries.
CYPRESS's PSoCBLE series products can solve the above-mentioned design problems and needs. PSoC? 4 is a scalable and reconfigurable platform architecture, including ARM? Cortex? -M0CPU programmable embedded system controller. It combines programmable, reconfigurable analog and digital modules with flexible automatic routing resources. The PSoCBLE series of products based on this platform integrates Bluetooth low energy (BLE for short, also known as BluetoothSmart) microcontrollers, wireless modules and subsystems. Other features include digital programmable logic, high-performance analog-to-digital conversion (ADC), comparator-mode operational amplifiers, and standard communication and timing peripherals.
The following is the functional block diagram of the PSoCBLE heart rate monitor solution.
PSoCBLE series products provide simple and easy-to-implement single-chip BLE solutions for heart rate monitors, and provide standard heart rate test profiles for developers' reference. A programmable operational amplifier and SARADC are provided on-chip, which can be used for heart rate signal detection and filtering. The product integrates the CapSense user interface of capacitive touch buttons, sliders and touch pads, and also integrates LCD segment code LCD screen driver for displaying heart rate signals. Five flexible and configurable low-power modes are provided for low-power applications, which can be used to extend the standby time of products. In addition, the BALUN circuit is integrated inside the product, which makes the antenna design simpler. In addition, the graphical visualization of PSoCCreator software provides developers with a friendly and easy-to-use development environment, which can greatly shorten the development cycle of developers and speed up time to market.
In summary, CYPRESSPSoCBLE series products can provide a perfect heart rate monitor solution. The application of single-chip solution products not only meets the actual needs of the products, but also saves development costs and development cycles.
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