페이지 정보작성자 키트 작성일2017-08-31 13:02 조회679회 댓글0건
Teardown: Syma X5C Drone
Courtesy of All About Circuits
Drones are becoming very popular, but what causes them to take off? Today, ‘drones’ are fairly easy to fly thanks to complex electronics and control algorithms. Packed inside modern drones are wireless radios, accelerometers, gyroscopes, and microprocessors. Let’s take a look at what is inside a drone!
The Circuit Board Inside the Drone
This drone uses a single two sided circuit board. There are many wires connected to the board for the LED lights, motors, a battery, and antennas. All of these wires are soldered directly to the surface mount pads. They appear to be hand soldered.
The Hand Soldered Wire Connections
Drones use various sensors to stay in control. The amount of sensors can vary from drone to drone. Many drones use sensors such as camera sensors, barometers, accelerometers, gyroscopes, GPS receivers, and ultrasonic sensors. The drone used in this teardown has a gyroscope and accelerometer. The sensor used in this drone is a MPU6050 made by InvenSense. This IC contains both the accelerometer and gyroscope in the same package. The sensor communicates over an I2C bus with the application processor.
The InvenSense Gyroscope and Accelerometer
One of four of the drone’s DC motors
This drone uses 4 small DC motors to keep it in the air. These motors are 7mm by 21mm with a small plastic pinion gear pressed onto the 1mm shaft. These small motors, often referred to as pager motors, contain a relatively strong neodymium magnet and an iron-less stator that is comprised entirely of copper windings.
One of the two FET arrays!
To power the small DC motors on the drone, there are two dual N-Channel MOSFETs, Fairchild Semiconductor part FDW9226A. These can supply up to 4.5 amps continuous and up to 30 amps pulsed. There are two of these ICs with two FETs in each package.
The Beken 2.4GHz transceiver
Many drones communicate with a 2.4Ghz radio system and this one is no different! Inside of this drone there is a transceiver to facilitate two way communication. The IC behind the radio connection is a BK2424 manufactured by Benken. Paired to the radio IC is a wire antenna that is located inside of the drone.
The 500mAh Li-Ion Cell
Powering this drone is a single cell lithium battery. This is a 3.7v nominal cell with a capacity of 500mAh. This battery gives the drone a run time of around 7 minutes. The battery is charged through a USB powered charger.
The USB Battery Charger
One of the Drone’s LED strips
To give the drone operator the orientation of the drone, it has 4 small LED strips, two red LEDs and two of green ones. In addition to relaying the orientation, they also indicate the radio status to the operator. These LEDs have hand soldered wires attached to them.
The Camera PCB
Mounted to this drone is a 720p camera that records the video to an (included!) SD card. This camera’s main processor is in a chip-on-board package covered by a blob of epoxy. Also on the PCB is an EtronTech EM638165TS DRAM IC, crystal oscillator, SD card slot, and microphone!
The Rear of the Camera PCB
Drones are becoming very popular and the cost of them is really dropping. The drone in this teardown was under $40. The low price does show in the relatively poor build quality. Many of the circuit boards were not cleaned and had flux remaining on them. The drone’s sensors and software did, however, make flying it extremely easy.
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