A black drone whirred into the sky over the Rancocas Creek with four cables underneath, clutching a cigar-shaped magnetometer like the prize in an arcade claw game. From a height of 100 feet ...

Precise positioning of the drone is ensured by a GPS/GLONASS navigation system working in conjunction with a three-axis magnetometer. Read also: ...

The drone is almost entirely built from expansion ... includes a 3-axis gyroscope, accelerometer, and magnetometer; runs on an ESP8266-12S 32-bit MCU; fully charges within 45 minutes through ...