DIY wireless mouse or keyboard

This wireless mouse/keyboard does not need to make any changes to the appearance and internal circuit of the original mouse when making it. It is easy to use and reliable, and is very suitable for hobbyists to make it themselves. Its working principle is to use the coding circuit MC145026/MC145027 and the radio frequency transmitting/receiving module TDA1808/TDA1809 to cooperate with each other, and the mouse can be flexibly controlled within a range of 10~120m.

Generally, there are 4 circuit connection lines inside the cable connecting the mouse and the computer, which are the positive pole of the power supply, the power ground, the data line 1, and the data line 2. First, go to the computer city to buy a PS2 socket and a PS2 plug (a discarded mouse or keyboard plug can also be used), and then connect the 4 lines in the interface with those drawn in the figure, and use the data transmission terminals D6 and D7 of the MC145026 encoding circuit to receive the data from the mouse data line 1 and data line 2, and transmit it through the RF transmission module TDA1808 after encoding it inside the chip.

After the RF transmitting module TDA1809 works, the received coded information is input into the MC145027 decoding circuit. After conversion, the signals of the original mouse data line 1 and data line 2 are restored at the data output terminals D6 and D7 of the chip. Connect D6, D7, the positive power supply and the ground power supply to the PS2 plug accordingly, and then connect to the computer, and you're done.

It can be seen that the above circuit does not require changes to the mouse/keyboard and computer, and does not require the installation of additional driver software. All functions of the original mouse/keyboard can also be used normally. This circuit (see Figure 1 and Figure 2) can work without debugging as long as the selected components are normal. The purpose of this circuit is to play the role of a wireless carrier transmission. The encoding and decoding circuit is to prevent external interference, and the RF transmission/receiving module plays a wireless transmission role.