Robot wireless remote control receiving circuit

 (2) Receiving circuit The receiving circuit consists of transistor VT1 and G, cI, Ll, L2 and C3 to form a super regenerative detection circuit, as
shown in , which extracts the modulated square wave signal in the high-frequency signal received by the antenna. , sent to DJ-27 to receive dedicated circuit pin @ input amplification and comparison judgment.
The power supply of VT1 is supplied with about 5v voltage from the pin ① of DJ-27, which generates super regenerative oscillation. Adjust Ll to make the oscillation frequency close to the
carrier frequency of the transmitter and receiver, 27MHz. Under the action of the differential beat of these two frequencies, a modulated square wave signal is generated on the Yong, which first passes through G and C. R6 filters
out high-frequency components, and then couples through c6 to block DC. cl. After further filtering, the DJ-27's legs are added. After amplification, comparison and judgment inside DJ-27,
it is output by pins ⑨, ⑩ and @.
    When S1 and S2 in Figure 7-16 are disconnected, no signal is transmitted. The pins ⑨~@ of DJ-27 in the receiving circuit are open circuit, Kl, K2 and K3 are not connected
, and the robot does not work. Sl is closed and the control signal is emitted. Pin ◎ of DJ-27 outputs low level, pins ⑩ and @ are open, relay K1
is closed, the Kl normally open contact connected to the robot is closed, and the robot starts to move. Same reason. S2 is closed, and pin ⑩ of DJ-27 outputs low level
. K2 is closed, pins ⑨ and ⑩ are open, and the robot moves. Sl and S2 are closed at the same time, DJ-27 pin @ outputs low level, K3 is closed,
pins ⑧ and ⑩ are open, and the robot moves.
    (3) The robot drive system is the hands and feet of the robot. That is, the basic components of the movement mechanism and actuator. The design and production of the drive system
is an important part of competition robot design and practice. Its task is not only to transmit power to the robot, but also to provide accurate
motion positioning and flexible operation. It is one of the magic weapons for the robot to win, so its importance is self-evident. There are usually three ways to drive robots: electrical,
hydraulic, and pneumatic. Among them, electric drive is the most common, which can be divided into DC motor and AC motor according to the power supply method. Robot
competition rules usually stipulate the use of battery power, that is, direct current. Almost all competition robots are driven by DC motors.