{"id":648,"date":"2026-07-14T16:23:03","date_gmt":"2026-07-14T16:23:03","guid":{"rendered":"https:\/\/fleximodo.com\/blog\/?p=648"},"modified":"2026-07-15T13:41:07","modified_gmt":"2026-07-15T13:41:07","slug":"how-do-parking-sensors-work-a-complete-guide-to-the-technology","status":"publish","type":"post","link":"https:\/\/fleximodo.com\/blog\/2026\/07\/14\/how-do-parking-sensors-work-a-complete-guide-to-the-technology\/","title":{"rendered":"How Do Parking Sensors Work? A Complete Guide to the Technology"},"content":{"rendered":"\n

How do parking sensors work? <\/h2>\n\n\n\n

In short, an IoT parking sensor sits at a single space and notices when a car changes the magnetic field above it. Then it fires a radar pulse to confirm the reading, and it sends the result wirelessly to the cloud. Because two methods work together, detection reaches 99.96% accuracy. So the system knows a space is taken within seconds, without a camera and without any wiring in the ground.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

That combination is the whole trick. However, to see why it is so reliable, it helps to look at each detection method on its own.<\/p>\n\n\n\n

What a parking sensor actually detects<\/h3>\n\n\n\n

A parking sensor does not “see” a car the way a camera does. Instead, it measures physical change directly under the vehicle. Fleximodo uses two independent signals for this: the earth’s magnetic field, and reflected radar. Because each signal fails in different conditions, using both removes almost every false reading. As a result, a parking occupancy sensor<\/a> stays accurate in glare, darkness, rain, and snow, where a lens would struggle.<\/p>\n\n\n\n

Magnetometer detection: how a car changes the magnetic field<\/h3>\n\n\n\n

Every vehicle is a large mass of metal. So when a car parks over the sensor, it distorts the local magnetic field<\/a>, much like a magnet bends the needle of a compass. A magnetic parking sensor measures that distortion and reads it as “occupied.” When the car leaves, the field returns to normal, and the sensor reads “free.”<\/p>\n\n\n\n

This method is cheap, low-power, and reliable for most cars. However, it has one weakness. For example, a large metal object nearby, or a very high vehicle with a lot of ground clearance, can occasionally confuse a magnetometer working alone. That is exactly why a second method matters.<\/p>\n\n\n\n

Radar confirmation: why the second signal matters<\/h3>\n\n\n\n

A radar parking sensor sends a short pulse upward and measures what bounces back. If something solid sits close above the sensor, the radar confirms a vehicle. So when the magnetometer and the radar agree, the reading is certain. This dual approach is how Fleximodo reaches 99.96% verified accuracy<\/a>, compared with roughly 95% for magnetometer-only sensors.<\/p>\n\n\n\n

In other words, the magnetometer does the everyday work, while the radar catches the edge cases. Together they cover for each other.<\/p>\n\n\n\n

Radar-only mode<\/h3>\n\n\n\n

Sometimes a site makes magnetic detection unreliable, for instance a steel-deck car park or a spot right beside heavy machinery. In those cases, the sensor can run in radar-only mode. Therefore even difficult surfaces get accurate occupancy data, without special cabling or civil works.<\/p>\n\n\n\n

Power and connectivity<\/h3>\n\n\n\n

A parking sensor is useless if it cannot report what it sees. So each unit communicates wirelessly over a low-power network, such as LoRaWAN<\/a>, NB-IoT<\/a>, Sigfox, or LTE-M. Because the sensor sends a tiny status message rather than a video stream, power draw stays extremely low. As a result, one battery lasts up to 10 years, and there is no trenching, no mains power, and no ongoing wiring cost.<\/p>\n\n\n\n

\"Fleximodo<\/figure>\n\n\n\n

Under-surface vs on-surface mounting<\/h3>\n\n\n\n

Finally, the same sensor fits almost any site through two mounting options. An under-surface adapter drops the unit flush into the road, which keeps it hidden and protected. An on-surface adapter fixes it to the top of the tarmac, which suits sites where drilling is limited. Either way, installation takes minutes per space rather than hours.<\/p>\n\n\n\n

\"Fleximodo's<\/figure>\n\n\n\n

How do parking sensors work, step by step<\/h3>\n\n\n\n

Here is the full sequence, from empty space to live data.<\/p>\n\n\n\n

    \n
  1. A car parks over the sensor, so the magnetometer registers the change in the magnetic field.<\/li>\n\n\n\n
  2. Next, the radar fires a pulse and confirms a vehicle is present.<\/li>\n\n\n\n
  3. Then the sensor sends an “occupied” message over its wireless network.<\/li>\n\n\n\n
  4. Within seconds, the cloud platform updates that space and any connected app or sign.<\/li>\n\n\n\n
  5. Finally, when the car leaves, the sensor reports “free” and the count updates again.<\/li>\n<\/ol>\n\n\n\n

    To see how that live data becomes guidance, payments, and enforcement, read our guide to the digital parking management system<\/a>.<\/p>\n\n\n\n

    FAQ<\/h2>\n\n\n\n

    How do parking sensors work?<\/strong>\u00a0<\/h3>
    \n

    A parking sensor detects a car through the change it makes in the magnetic field above the sensor, then confirms that reading with a radar pulse, and sends the result wirelessly to a cloud platform. The two methods together reach 99.96% accuracy.<\/p>\n<\/div><\/div>\n\n\n\n

    Are parking sensors magnetic or radar?<\/strong><\/h3>
    \n

    Fleximodo sensors use both. A magnetometer handles everyday detection, while a radar pulse confirms it and covers edge cases. A radar-only mode is available for sites where magnetic detection is unreliable.<\/p>\n<\/div><\/div>\n\n\n\n

    How accurate are parking sensors?<\/strong><\/h3>
    \n

    Combining a magnetometer with radar reaches 99.96% verified detection accuracy, compared with about 95% for magnetometer-only sensors.<\/p>\n<\/div><\/div>\n\n\n\n

    Do parking sensors need power or cabling?<\/strong><\/h3>
    \n

    No. They are battery powered, with a life of up to 10 years, and they communicate wirelessly, so there is no trenching or mains connection needed.<\/p>\n<\/div><\/div>\n\n\n\n

    How are parking sensors different from parking cameras?<\/strong><\/h3>
    \n

    A sensor gives one direct reading per space and works in any light, while a camera infers occupancy from an image and depends on sight lines. For the full comparison, see parking sensors vs cameras<\/a>.<\/p>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"

    How do parking sensors work? A magnetometer spots the car, a radar pulse confirms it, and the result travels wirelessly to the cloud. Here is the detection technology behind IoT parking sensors, explained step by step.<\/p>\n","protected":false},"author":2,"featured_media":523,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[115],"tags":[119,12,117],"class_list":["post-648","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-smart-parking","tag-digitalparking","tag-parkingsensors","tag-smartparking"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t