Multi-function mouse Design Based on GHz RF communication

Welcome to the IT technology community forum and interact with 2 million technical staff to access the multi-functional wireless mouse, including wireless transmitter and wireless receiver. The launch part is a key part of its overall performance. The system builds a wireless transmitter module with the core of nRF24L01. NRF24L01 is a new type of single-chip RF transceiver, working on 2.4 ~ 2.

Welcome to the IT technology community forum, and interact with 2 million technical staff> enter the multi-function wireless mouse, including the Wireless Transmitting part and the wireless receiving part. The launching part is a key part of its overall performance. The system builds a wireless transmitter module with the core of nRF24L01. NRF24L01 is a new type of single-chip RF transceiver, working on 2.4 ~ 2.

Welcome to the IT Community Forum and interact with 2 million technicians>

The multi-function wireless mouse includes the Wireless Transmitting part and the wireless receiving part. The transmitting part is a key part related to the overall performance. The system builds a wireless transmitter module with the core of nRF24L01.

NRF24L01 is a new type of single-chip RF transceiver, working on 2.4 ~ 2.5 GHz ISM band, built-in function modules such as frequency synthesizer, power amplifier, crystal oscillator, and modulation, and integrated with enhanced ShockBurst technology. The output power and communication channel can be configured through a program. Low Power Consumption of nRF24L01. When transmitting at 0 dBm power, the operating current is only 11.3 mA; when receiving, the operating current is only 12.3 mA; multiple low power working modes (power loss and idle mode) makes energy-saving design more convenient.

The multi-function wireless mouse is a battery-powered handheld device. power consumption is an important measure of its performance. The main control chip selected in this design is MSP430F413, which is A 16-bit Ultra-Low Power hybrid signal processor. in active mode, the maximum current is 350 μA, only 0.1 μA is consumed when RAM data is maintained. Optical sensor chip selection ADNS-5030. This chip is small in size and low in power consumption. In working mode, its operating current is up to 17 mA. The LED is lit only when the light sensor is working, this will further reduce the power consumption of the optical sensor (less than 1 mA ).

This article introduces the development process of multi-function wireless mouse emission, and discusses the precautions and optimization methods in its design and application. During the design process, pay more attention to the details and optimization methods to make the design smoother and provide effective time for large-scale algorithms.

1. hardware circuit design

The multi-function wireless mouse transmitter module collects the displacement of optical sensors and key values, and transmits the data to the receiver wirelessly. It consists of the control part, the optical sensor part, the mouse key and the keyboard part, and the wireless transmitter part. The system dialog box is displayed.

1.1 Wireless Transmission

The Wireless Transmitting part is the main part of the multi-function wireless mouse. This design uses the nRF24L01 as the core to construct the Wireless Transmitting module.

With the 2.4 GHz global open ISM band, nRF24LOl features built-in hardware CRC detection and one-point multi-point communication address control. The data transmission rate is 2 Mb/s and 126 channels; it can meet the needs of multi-point communication and frequency-hopping communication; low power consumption, and the power supply voltage is 1.9 ~ 3.6 V. The active current in standby mode is 22 μA, and only 900 nA in power-down mode. These are the main advantages of nRF24L01.

The circuit principle 2 of the wireless transmitter is shown in.

1.2 Power Management

Handheld systems have strict requirements on low power consumption. The MSP430 Series Single-Chip Microcomputer has five low-power modes. If no operation is performed for A certain period of time, it can be switched to A low-power mode, and the current can be controlled below 10 μA.

For peripheral devices, such as optical sensors and Wireless Transmitting components, a switch is set up to cut off the power of the main control chip before it enters the low power mode, so that the power consumption of the system is further reduced. When the operation arrives, the main control chip returns from the low power consumption mode to the active mode, first turn on the power switch of the peripheral device, so that the system can work normally. Low Power Supply Control Circuit 3. The switch is composed of a PNP transistor. The base pole acts as the input of the control signal, transmitting an extremely voltage input, and the Collector outputs extremely voltage. The Level Change of the control signal can be used to disconnect the power supply on the control line.

1.3 optical sensor part

The light sensor ADNS-5030 is used for mouse positioning. The normal operating voltage of the ADNS-5030 is 3.3 V. In the design of the optical sensor, the 3.O V voltage of the battery output needs to be converted to the 3.3 V voltage. The circuit uses an HT7733 chip to complete voltage conversion. The ADNS-5030 communicates with the master chip through SPI bus, and its connection mode is 4.

1.4 buttons and keyboard

The buttons of the multi-function wireless mouse are basically the same as those of the normal mouse, but the scroll wheel of the normal mouse is changed to the upper and lower keys. The two designs have the same functions. The keyboard is used to input Arabic numbers, letters, and various function keys. The matrix keyboard is used to save the I/O port resources of the master chip.

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