Single-board miniature multichannel model airplane receiver

Abstract

The utility model provides a single-board miniature multichannel model airplane receiver, belongs to the field of miniature model airplane receivers, and aims to solve the problems of miniaturization and multiple expansion functions of the receiver. The receiver is characterized by comprising a power supply voltage stabilizer, a burning plug, an indicating lamp, a radio module, a circuit control chip, a 12-channel steering engine PWM signal plug, an acceleration sensor, a low-noise amplifier, a low-pass filter and an independent crystal oscillator, the voltage stabilizing chip, the circuit control chip, the acceleration sensor, the burning socket, the LED indicating lamp, the antenna plug and the radio module are arranged on a circuit board; the model airplane receiver has the advantages that the problems that an independent acceleration sensor and an information synthesis circuit are arranged outside a radio module of a model airplane receiver in the prior art, so that circuit miniaturization is not facilitated, and signal transmission delay depending on a steering engine is large are solved.

Description

Technical Field

[0001] This utility model relates to the field of miniature model aircraft receivers, specifically to a single-board miniature multi-channel model aircraft receiver. Background Technology

[0002] Due to current limitations imposed by site size and relevant regulations, miniaturization of model aircraft is becoming increasingly advantageous.

[0003] Existing model aircraft receiver designs reduce the number of channels offered, typically to four or fewer. This design ensures controllability but reduces expandability. Additionally, some designs use electromagnetic rudder PWM signal output; while electromagnetic rudders are simpler in structure and lighter than servo motors, they lack control precision. Furthermore, current receiver circuits with gyroscope stabilization technology are relatively bulky.

[0004] Common receivers with stabilization technology employ a separate layout for the radio module and accelerometer. The radio module is solely responsible for demodulating and decoding the signal from the remote controller to generate servo signals. The accelerometer is only responsible for calculating the required correction signal based on the current sensor attitude (pitch, roll, yaw, and acceleration along the x, y, and z axes). Both the radio module and the accelerometer module have separate processing chips and independent circuit boards, increasing the overall system size. Furthermore, to integrate the information from the radio module and the accelerometer module, they need to be connected to additional circuitry. Some current designs do not use a separate information integration circuit; instead, the accelerometer signal input is connected to the servo signal output of the radio module. Based on the servo PWM signal and the attitude information measured by the accelerometer itself, a separately calibrated servo PWM signal is output. In previous designs, the radio module was the foundation, with the accelerometer and information integration circuitry acting as add-ons. Current modular designs are not conducive to circuit miniaturization, and because information transmission between modules relies on servo signals, there is significant latency.

[0005] In view of the above, this utility model proposes a single-board miniature multi-channel model aircraft receiver, which can solve the problems of reduced expandable functions and decreased control precision caused by the miniaturization of model aircraft. Utility Model Content

[0006] To address the issues in the current field of miniature model aircraft receivers where miniaturization reduces expandable functions and decreases control precision, this invention proposes a single-board miniature multi-channel model aircraft receiver. This single-board miniature multi-channel model aircraft receiver achieves multi-channel servo control, facilitating the expansion of model aircraft functions. Compared to model aircraft receivers with similar functions, it has a smaller size, which is beneficial for applications in miniature model aircraft scenarios. The integration of an acceleration sensor on the receiver ensures the stability of the model aircraft and reduces the number of modules required.

[0007] The technical solution of this utility model is as follows:

[0008] A single-board miniature multi-channel model aircraft receiver, the receiver comprising:

[0009] Power regulator, programming connector, indicator lights, radio module, circuit control chip, 12-channel servo PWM signal connector, accelerometer, low-noise amplifier, low-pass filter and independent crystal oscillator;

[0010] The inputs of the circuit control chip include a first input and a second input;

[0011] The first input is connected to the radio module and is used to process the received radio signals;

[0012] The second input is connected to the accelerometer and is used to process the received accelerometer signal.

[0013] The output of the circuit control chip includes a first output, which is connected to a 12-channel servo motor and is used to output the servo motor angle value. The first output of the circuit control chip includes 12 pins for outputting the PWM signal used by the servo motor. The pins are connected to the servo motor signal plug and the LED indicator.

[0014] The radio module includes a radio chip and a power amplifier chip;

[0015] The inputs of the radio chip include a first input, a second input, a third input, and a fourth input. The first, second, and third inputs of the radio chip are used to receive instructions from the circuit control chip, and the fourth input of the radio chip is used to receive radio signals.

[0016] The output of the radio chip includes a first output for signal processing, which demodulates the received signal and transmits it to the circuit control chip;

[0017] The power amplifier chip has a first input for receiving radio signals;

[0018] The power amplifier chip's output includes a first output, used to amplify radio signals for re-output;

[0019] The input and output states of a power amplifier chip can be interchanged and are controlled by the input pins;

[0020] The inputs of the accelerometer include a first input, a second input, and a third input, which are used to control the circuit chip.

[0021] The output of the accelerometer includes a first output for transmitting acceleration signals to the circuit control chip;

[0022] The programming plug is used to update the program of the circuit control chip;

[0023] The servo signal plug is used to control the throttle, ailerons, elevator and rudder of the model aircraft.

[0024] The voltage regulator chip, circuit control chip, accelerometer, programming socket, LED indicator, antenna plug, and radio module are all mounted on a single circuit board. The 12 channels are located on the left and right sides of both sides of the circuit board. Specifically, the voltage regulator chip is located on the upper left of the front side of the circuit board, the circuit control chip is located in the middle of the front side of the circuit board, the accelerometer is located to the right of the circuit control chip on the front side of the circuit board, the programming socket is located below the circuit control chip on the front side of the circuit board, and the indicator light is located on the lower right of the front side of the circuit board.

[0025] The antenna plug is located on the upper left side of the back of the circuit board, the power amplifier chip is located on the lower left side of the back of the circuit board, and the radio chip is located on the right side of the back of the circuit board.

[0026] The receiver has servo signal output pins arranged along its wide side, and the power line is parallel to the long side of the receiver. The receiver coincides with the axis of symmetry of the model aircraft.

[0027] Furthermore, the servo motor uses a PWM pulse signal with a period of 20ms and a maximum pulse width of 2ms.

[0028] Furthermore, one of the pins of the circuit control chip is connected to an LED indicator.

[0029] Furthermore, the radio frequency signal of the radio chip is amplified by a power amplifier chip to maintain the signal transmission distance at 500-1500m.

[0030] Furthermore, the radio chip includes pins for controlling the start of signal reception and pins for indicating that new data has been received.

[0031] Furthermore, the servo signal plug includes three pins: the first pin is connected to the servo signal, the second pin is connected to the positive terminal of the battery power supply, and the third pin is connected to ground, serving as the negative terminal of the battery power supply.

[0032] Furthermore, the radio chip is connected in parallel with a capacitor to stabilize the voltage.

[0033] Furthermore, the low-noise amplifier is used to maintain the remote control distance;

[0034] The low-pass filter is used to remove high-frequency noise from the antenna;

[0035] The independent crystal oscillator is used to provide clock signals;

[0036] The circuit control chip includes 12 pins for parallel output of servo signals.

[0037] This utility model also provides a model aircraft, which includes the aforementioned single-board miniature multi-channel model aircraft receiver. The beneficial effects of this utility model are: the single-board miniature multi-channel model aircraft receiver provided by this utility model further reduces the size of the receiver; all output interfaces of the receiver are oriented in the same direction as the long side of the receiver, facilitating wire management; while ensuring the miniaturization of the model aircraft, it achieves multiple expandable functions and maintains control precision. Attached Figure Description

[0038] Figure 1 This is a flowchart of the signal processing of this utility model.

[0039] Figure 2 This is a schematic diagram of the circuit principle of this utility model.

[0040] Figure 3 This is a 3D model diagram of the present invention. Detailed Implementation

[0041] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0042] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] like Figure 1 The diagram shows the signal processing flowchart of a single-board micro multi-channel model aircraft receiver proposed in this invention. The signal processing flowchart provided by this invention integrates the accelerometer, radio module, and circuit control chip onto the same circuit board. Furthermore, it integrates the flight control algorithm responsible for processing the accelerometer signals and the program responsible for servo signal output into a single chip, enabling faster response. (See attached drawings.) Figure 1 In the diagram, the arrows for servo angle and model attitude are set as dashed lines to represent the mechanical effects, while solid arrows indicate the direction of data flow.

[0045] like Figure 2 The diagram shows the circuit principle of this invention. This invention integrates a radio module, an accelerometer, and an information integration circuit onto a single circuit board. After integration, the independent signal processing chips for the radio module and accelerometer can be integrated with the information integration circuit onto a single circuit control chip. The circuit control chip has 12 servo signal pins as output pins, connected to the servo connector. Additionally, the LED indicator pins are output pins, and the input pins are connected to the programming connector. Communication between the signal processing chip and the radio and accelerometer components uses an SPI bus. The signal processing chip acts as the master, and SCK, MOSI, and CS are outputs.

[0046] In practical implementation, the radio module mainly consists of a radio chip and a power amplifier chip. On the radio chip, MISO is the output, and SCK, MOSI, and CS are the first, second, and third inputs, respectively, used to receive commands from the circuit control chip. The two antenna pins, ANT, are the fourth inputs of the radio chip, used as radio signal inputs. The ANT pin of the power amplifier chip is its first input, used for radio signal input. The signal amplified by the chip is output from its first output pin, TX / RX. The input / output states of the ANT and TX / RX pins of the power amplifier chip can be interchanged; this function is determined by the TXEN and RXEN input pins.

[0047] In practical implementation, for an accelerometer chip, MISO is the first output of the accelerometer, and SCK, MOSI, and CS are the first, second, and third inputs of the accelerometer.

[0048] The servo signal connector can connect to servos, motor speed controllers, and other actuators, enabling operation of functions related to the model aircraft's throttle, ailerons, elevators, and rudder. Furthermore, adding more channels not only supports increasing the number of control channels (e.g., using two throttle channels for differential control), but also adds additional support functions such as flaps, landing gear, speed brakes, wing sweep angle, and additional indicator lights.

[0049] In practical implementation, the receiver is powered by a lithium battery with a voltage range of 3.7-4.2V. The positive terminal is connected to VCC, and the negative terminal is connected to GND. The voltage is stabilized at 3.3V by a voltage regulator to power the chip, and the output voltage is connected to 3V3. This design includes an external programming interface for easy updates to the circuit control chip program. One pin of the circuit control chip is connected to an LED indicator to display the operating status.

[0050] In a preferred embodiment, the voltage regulator is model XC6206.

[0051] The circuit control chip is responsible for the servo signal output and data processing with the accelerometer and radio. The 12 pins CH1 to CHC on the circuit control chip are used to output the PWM signal for the servo, which is directly connected to pin 1 of the servo signal connector (model HX-PM1.0 1*3P). Since the servo power supply and receiver power supply come from the same lithium battery, the high-level servo signal is consistent with the lithium battery voltage. Therefore, the VIO pin of the 8051F411 circuit control chip is connected to the battery power supply VCC, allowing the pin output to be directly powered by the lithium battery.

[0052] In a preferred embodiment, the circuit control chip is model 8051F411(U24).

[0053] The 8051F411 circuit control chip connects to the accelerometer and radio chip via an SPI synchronous serial bus, sharing three lines: MOSI, MISO, and SCK, effectively reducing the number of connections. The use of a synchronous serial port instead of an asynchronous one ensures high data transmission rates and rapid attitude response, including pitch, roll, yaw, and acceleration along the x, y, and z axes. The SPI bus has a chip select line (CS) for selecting a specific chip to transmit data to. The radio chip connects to CS0, and the XC6206 voltage regulator connects to CS1. The radio chip has a CE pin for controlling the start of signal reception and an IRQ pin for indicating the receipt of new data, both connected to the circuit control chip.

[0054] In a preferred embodiment, the accelerometer is model ICM-42688(U23) and the radio chip is model NRF24L01+.

[0055] The signal processing of the radio module is mainly handled by the NRF24L01+ (U2) radio chip, which demodulates the received signal and transmits the data to the circuit control chip. To achieve a longer remote control distance, the signal from the antenna passes through a low-noise amplifier before entering the NRF24L01+ radio chip. An antenna socket (U22) is provided on the receiver for replacing different types of antennas. Components L4, L5, and C8-C10 form a low-pass filter to remove high-frequency noise from the antenna. Since the low-noise amplifier can only amplify single-ended signals, a converter is needed to adapt to the NRF24L01+ radio chip circuit. The circuit consisting of L1, L2, L3, C1, C3, C4, and C11 converts the single-ended signal to a double-ended signal. The NRF24L01+ radio chip requires a relatively precise clock signal, so an independent crystal oscillator (X1) is used. Since the signal amplifier requires a relatively stable power supply when receiving signals, capacitors C15, C14, and C2 are connected in parallel between VDD, DVDD and ground of the radio chip NRF24L01+ for voltage regulation.

[0056] In a preferred embodiment, the low-noise amplifier is model RFX2401(U21), and the antenna socket is model IPEX1.

[0057] The servo signal connector (U5-U16) uses a three-pin connector that is compatible with general servo connectors. Pin 1 is connected to the servo signal, pin 2 is connected to the positive terminal VCC of the battery power supply, and pin 3 is connected to ground as the negative terminal of the battery power supply. This connection method can prevent the positive and negative terminals of the power supply from being reversed due to reverse connection of the connector, which could damage the servo.

[0058] Specifically, the receiver uses a 2.4GHz wireless transceiver chip to receive signals. This chip also supports signal transmission, facilitating signal transfer between different receivers. The acceleration signal is taken from the accelerometer chip. The radio signal received by the receiver is combined with the accelerometer signal in the circuit control chip to determine the appropriate servo output angle value, which is then output through the corresponding servo port.

[0059] Specifically, the single-board micro multi-channel model aircraft receiver provided by this utility model uses an 8051 microcontroller as the circuit control chip to control peripherals. The 8051 microcontroller, the 8051F411 circuit control chip, and the NRF24L01+ radio chip transmit data via an SPI serial port to ensure the highest possible data transmission rate. The 8051 microcontroller has 12 pins for parallel output of servo signals, avoiding the limitation on the number of control channels imposed by conventional serial output methods. Ideally, ignoring the time required for signal processing, a serial output method can only support a maximum of 10 channels. Parallel output effectively avoids this limitation.

[0060] Specifically, the single-board micro multi-channel model aircraft receiver provided by this utility model is equipped with an acceleration sensor, and the radio module and circuit control chip are set on the same circuit board. The flight control algorithm responsible for processing the acceleration sensor and the program responsible for servo signal output are integrated into one chip, which can achieve a faster response.

[0061] Specifically, the single-board miniature multi-channel model aircraft receiver circuit board provided by this utility model has a width of 15mm and a length of 20mm. The servo signal output pins are arranged on the wide side of the receiver. This layout allows the power line to be parallel to the long side of the receiver when connecting servo signals, enabling it to adapt to narrower fuselage designs.

[0062] Specifically, the single-board miniature multi-channel model aircraft receiver provided by this utility model has a radio chip, a low-noise amplifier, an independent crystal oscillator, a low-pass filter, and an antenna socket located on the back of the circuit board. Since the output signal of the radio module is a high-frequency signal, it will be attenuated when passing through the hole. The arrangement of this utility model reduces the bending of the wires and ensures that the signal attenuation is reduced.

[0063] Specifically, the single-board miniature multi-channel model aircraft receiver provided by this utility model has an accelerometer sensor mounted on the front of the circuit board, so that the sensor reads the correct angular velocity along the axial direction, and the central axis of the sensor coincides with the axis of symmetry of the circuit board.

[0064] Specifically, this includes a model aircraft equipped with a single-board miniature multi-channel model aircraft receiver provided by this utility model, wherein the receiver and the model aircraft's axis of symmetry coincide. Finally, it should be noted that the above specific embodiments are intended to illustrate the technical solution of this utility model and do not constitute any form of limitation on this utility model. Those skilled in the art should fully understand that modifications to the technical solutions described in the foregoing embodiments or equivalent substitutions for any part or all of the technical features are entirely feasible. Such modifications or substitutions, as long as they do not deviate from the protection scope defined by the claims of this utility model, should be considered reasonable extensions of this utility model.

Claims

1. A single board micro multi-channel model receiver characterized by, The receiver comprises: a power stabilizer, a burning plug, an indicator light, a radio module, a circuit control chip, a 12-channel steering engine PWM signal plug, an acceleration sensor, a low-noise amplifier, a low-pass filter and an independent crystal oscillator; the input of the circuit control chip comprises a first input and a second input; the first input is connected with the radio module and is used for processing the received radio signal; the second input is connected with the acceleration sensor and is used for processing the received acceleration sensor signal; the output of the circuit control chip comprises a first output, which is connected with the 12-channel steering engine and is used for outputting the steering engine angle value, and the first output of the circuit control chip comprises 12 pins used for outputting the PWM signal for the steering engine, which are connected with the steering engine signal plug and the LED indicator light; the radio module comprises a radio chip and a power amplification chip; the input of the radio chip comprises a first input, a second input, a third input and a fourth input, the first input, the second input and the third input of the radio chip are used for receiving the circuit control chip instruction, and the fourth input of the radio chip is used for receiving the radio signal; the output of the radio chip comprises a first output, which is used for signal processing, demodulating the received signal and transmitting the signal to the circuit control chip; the input of the power amplification chip comprises a first input, which is used for receiving the radio signal; the output of the power amplification chip comprises a first output, which is used for amplifying and outputting the radio signal; the input and the output of the power amplification chip are exchangeable and are controlled by the input pin; the input of the acceleration sensor comprises a first input, a second input and a third input, which are used for the circuit control chip instruction; the output of the acceleration sensor comprises a first output, which is used for transmitting the acceleration signal to the circuit control chip; the burning plug is used for updating the program of the circuit control chip; the steering engine signal plug is used for operating the control functions of the model airplane throttle, aileron, elevator and rudder; the stabilizer chip, the circuit control chip, the acceleration sensor, the burning socket, the LED indicator light, the antenna plug and the radio module are arranged on one circuit board, and the 12 channels are arranged on the left and right sides of the front and back surfaces of the circuit board, wherein the stabilizer chip is arranged at the upper left of the front surface of the circuit board, the circuit control chip is arranged at the middle part of the front surface of the circuit board, the acceleration sensor is arranged at the right side of the circuit control chip on the front surface of the circuit board, the burning socket is arranged at the lower side of the circuit control chip on the front surface of the circuit board, and the indicator light is arranged at the lower right of the front surface of the circuit board; the antenna plug is arranged at the upper left of the back surface of the circuit board, the power amplification chip is arranged at the lower left of the back surface of the circuit board, and the radio chip is arranged at the right side of the back surface of the circuit board; the wide side of the receiver is arranged with the steering engine signal output pin, the power line is parallel to the long side of the receiver, and the receiver is coincident with the symmetry axis of the model airplane.

2. The single board micro multi-channel glider receiver of claim 1, wherein, The steering engine adopts a PWM pulse signal with a period of 20 ms and a maximum pulse width of 2 ms.

3. The single board micro multi-channel glider receiver of claim 1, wherein, One pin of the circuit control chip is connected with the LED indicator light.

4. The single board micro multi-channel glider receiver of claim 1, wherein, The radio frequency signal of the radio chip passes through the power amplification chip and is used for keeping the signal transmission distance at 500-1500 m.

5. The single board micro multi-channel glider receiver of claim 1, wherein, The radio chip includes a pin for controlling the start of signal reception and a pin for indicating the reception of new data.

6. The single board micro multi-channel glider receiver of claim 1, wherein, The steering engine signal plug includes three pins, the first pin is connected to the steering engine signal, the second pin is connected to the positive pole of the battery power supply, and the third pin is connected to the ground as the negative pole of the battery power supply.

7. The single board micro multi-channel glider receiver of claim 1, wherein, The radio chip is connected in parallel with a capacitor for stabilizing voltage.

8. The single board micro multi-channel glider receiver of claim 1, wherein, The low-noise amplifier is used to maintain the remote control distance; The low-pass filter is used to remove high-frequency noise from the antenna; The independent crystal oscillator is used to provide a clock signal; The circuit control chip includes 12 pins for parallel output of the steering engine signal.

9. A model boat, characterized in that, A single-board micro multi-channel model airplane receiver comprising any one of claims 1-8.

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