{"product_id":"cjmcu-30003-max30003-ecg-afe-single-channel-biopotential-module","title":"CJMCU-30003 MAX30003 ECG AFE Single-Channel Biopotential Module","description":"\n\u003ch2\u003eCJMCU-30003 MAX30003 Single-Channel Biopotential AFE ECG Module\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eCJMCU-30003\u003c\/strong\u003e is a compact, high-performance development module built around the \u003cstrong\u003eMAX30003\u003c\/strong\u003e single-channel biopotential analog front-end (AFE) integrated circuit. Designed for engineers, researchers, and hobbyists working on wearable electronics, biosignal acquisition systems, and ECG (electrocardiogram) prototyping, this board delivers accurate cardiac electrical signal capture with integrated R-R interval detection — all in a small, breadboard-friendly footprint.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMAX30003 AFE IC:\u003c\/strong\u003e Industry-leading single-channel biopotential analog front-end optimized for ECG signal acquisition and R-R interval measurement.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eR-R Detection:\u003c\/strong\u003e Onboard hardware R-R interval detection enables real-time heart rate calculation without extensive external processing.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-Low Power Operation:\u003c\/strong\u003e Ideal for battery-powered wearable and portable biosignal acquisition designs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSPI Interface:\u003c\/strong\u003e Simple 4-wire SPI communication for easy integration with microcontrollers such as Arduino, STM32, ESP32, and Raspberry Pi.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrated Lead Detection:\u003c\/strong\u003e Onboard electrode lead-on\/lead-off detection circuitry for robust system-level design.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Common-Mode Rejection:\u003c\/strong\u003e Effectively filters out interference for clean, accurate biopotential signal capture.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact PCB Design:\u003c\/strong\u003e Small form factor makes it perfect for space-constrained wearable prototypes and development boards.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Supply Voltage Range:\u003c\/strong\u003e Compatible with standard 3.3V and 5V development platforms.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIC:\u003c\/strong\u003e Maxim MAX30003\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChannels:\u003c\/strong\u003e 1 (Single-Channel Biopotential)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCommunication Interface:\u003c\/strong\u003e SPI\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e ECG Acquisition, R-R Interval Detection, Biopotential Signal Measurement\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e GUANDO\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eMade in Mainland China\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× CJMCU-30003 MAX30003 ECG AFE Module\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWho Is This For?\u003c\/h3\u003e\n\u003cp\u003eThis module is ideal for electronics engineers, embedded systems developers, biomedical engineering students, and makers who need a reliable, easy-to-use biopotential acquisition front-end for ECG signal processing projects, wearable health monitoring prototypes, or academic research into cardiac biosignals.\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.energystar.gov\/products\" target=\"_blank\" rel=\"noopener\"\u003eENERGY STAR product efficiency guidance\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What microcontrollers are compatible with the CJMCU-30003 MAX30003 ECG AFE module?\u003c\/h4\u003e\n\u003cp\u003eA: The CJMCU-30003 uses a standard 4-wire SPI interface, making it compatible with a wide range of microcontrollers including Arduino (Uno, Mega, Nano), STM32, ESP32, ESP8266, Raspberry Pi, and most other development boards that support SPI communication.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is R-R detection and why is it important in an ECG AFE module?\u003c\/h4\u003e\n\u003cp\u003eA: R-R interval detection refers to the measurement of the time between successive R-peaks in an ECG waveform — the sharp, tall peaks corresponding to ventricular contraction. The MAX30003 performs this detection in hardware, allowing the host microcontroller to calculate heart rate and heart rate variability (HRV) with minimal processing overhead, which is especially valuable in low-power wearable applications.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does the CJMCU-30003 module require external electrodes?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. To capture ECG biopotential signals, you will need standard surface electrodes (such as disposable Ag\/AgCl snap or gel electrodes) connected to the module's electrode input pins. The module itself includes lead detection circuitry to indicate when electrodes are properly connected.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What supply voltage does the CJMCU-30003 MAX30003 module require?\u003c\/h4\u003e\n\u003cp\u003eA: The module is designed to operate at 3.3V, which is the standard operating voltage for the MAX30003 IC. Many boards also include level-shifting or regulation circuitry to allow use with 5V systems — refer to the module's schematic or datasheet for your specific revision.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What microcontrollers are compatible with the CJMCU-30003 MAX30003 ECG AFE module?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The CJMCU-30003 uses a standard 4-wire SPI interface, making it compatible with a wide range of microcontrollers including Arduino (Uno, Mega, Nano), STM32, ESP32, ESP8266, Raspberry Pi, and most other development boards that support SPI communication.\"}}, {\"@type\": \"Question\", \"name\": \"What is R-R detection and why is it important in an ECG AFE module?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"R-R interval detection refers to the measurement of the time between successive R-peaks in an ECG waveform — the sharp, tall peaks corresponding to ventricular contraction. 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