{"id":3305,"date":"2026-02-21T19:30:00","date_gmt":"2026-02-21T19:30:00","guid":{"rendered":"https:\/\/pirhome.com\/?p=3305"},"modified":"2026-02-21T19:30:00","modified_gmt":"2026-02-21T19:30:00","slug":"pir-vs-thermal-camera-arrays","status":"publish","type":"post","link":"https:\/\/www.pirhome.com\/?p=3305","title":{"rendered":"PIR Sensor vs. Thermal Camera Arrays: Technology Comparison"},"content":{"rendered":"

Introduction<\/h2>\n

Thermal camera arrays (e.g., MLX90640, AMG8833) are becoming popular for occupancy sensing. This article compares them with traditional PIR sensors to help you choose the right technology.<\/p>\n

How Thermal Camera Arrays Work<\/h2>\n

Thermopile arrays consist of multiple thermopile sensors arranged in a grid (e.g., 8\u00d78, 32\u00d724). Each pixel measures the temperature of the object in its field of view, creating a low-resolution thermal image.<\/p>\n

Comparison Table<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Aspect<\/th>\nPIR Sensor<\/th>\nThermal Camera Array<\/th>\n<\/tr>\n<\/thead>\n
Output<\/td>\nSingle motion event<\/td>\nTemperature matrix (image)<\/td>\n<\/tr>\n
Resolution<\/td>\nN\/A (binary or simple analog)<\/td>\n8\u00d78 to 32\u00d724 pixels<\/td>\n<\/tr>\n
Stationary Detection<\/td>\nNo (unless special high-sensitivity)<\/td>\nYes (detects warm objects regardless of motion)<\/td>\n<\/tr>\n
People Counting<\/td>\nRequires multiple sensors\/ML<\/td>\nPossible with image processing<\/td>\n<\/tr>\n
Privacy<\/td>\nExcellent (no image)<\/td>\nGood (no facial features at low res)<\/td>\n<\/tr>\n
Cost<\/td>\n$2-10<\/td>\n$20-100<\/td>\n<\/tr>\n
Power Consumption<\/td>\n\u00b5A<\/td>\nmA (10-50 mA)<\/td>\n<\/tr>\n
Complexity<\/td>\nSimple<\/td>\nRequires microcontroller with I2C and processing<\/td>\n<\/tr>\n
Field of View<\/td>\nDefined by lens (90-180\u00b0)<\/td>\nDefined by optics (typically 50-110\u00b0)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Applications Comparison<\/h2>\n

When PIR is Better<\/h3>\n
    \n
  • Battery-powered devices (low power).<\/li>\n
  • Simple motion detection (lights, alarms).<\/li>\n
  • Low-cost applications.<\/li>\n
  • Privacy-critical where even low-res imaging is undesirable.<\/li>\n<\/ul>\n

    When Thermal Arrays are Better<\/h3>\n
      \n
    • Presence detection (stationary people).<\/li>\n
    • People counting with direction.<\/li>\n
    • Occupancy estimation (how many people).<\/li>\n
    • Temperature screening.<\/li>\n
    • Applications where you need more than motion\/no-motion.<\/li>\n<\/ul>\n

      Case Study: Office Occupancy<\/h2>\n

      An office needed to know if desks were occupied (people sitting). PIR sensors failed because people sat still. Thermal arrays (MLX90640) mounted above each desk detected body heat reliably, regardless of motion.<\/p>\n

      Hybrid Approach<\/h2>\n

      A power-optimized solution: use PIR to wake the thermal array only when motion is detected. The thermal array then confirms presence and counts people, then goes back to sleep.<\/p>\n

      Popular Thermal Array Models<\/h2>\n
        \n
      • Melexis MLX90640 (32\u00d724, $40-50)<\/li>\n
      • Panasonic AMG8833 (8\u00d78, $30-40)<\/li>\n
      • Melexis MLX90641 (16\u00d712, $30-40)<\/li>\n<\/ul>\n

        Conclusion<\/h2>\n

        PIR and thermal arrays are complementary. PIR excels at low-power motion detection; thermal arrays provide richer information at higher cost and power. Choose based on your application’s requirements.<\/p>\n","protected":false},"excerpt":{"rendered":"

        Introduction Thermal camera arrays (e.g., MLX90640, AMG8833) are becoming popular for occupancy sensing. This article compares them with traditional PIR sensors to help you choose the right technology. How Thermal Camera Arrays Work Thermopile arrays consist of multiple thermopile sensors arranged in a grid (e.g., 8\u00d78, 32\u00d724). Each pixel measures the temperature of the object […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-3305","post","type-post","status-publish","format-standard","hentry","category-reference"],"blocksy_meta":[],"yoast_head":"\r\nPIR Sensor vs. Thermal Camera Arrays: Technology Comparison - PIRHOME<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"http:\/\/www.pirhome.com\/?p=3305\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"PIR Sensor vs. Thermal Camera Arrays: Technology Comparison - PIRHOME\" \/>\r\n<meta property=\"og:description\" content=\"Introduction Thermal camera arrays (e.g., MLX90640, AMG8833) are becoming popular for occupancy sensing. 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