Make This Joystick-Controlled Robot

This wireless robot project operates by splitting the system into two distinct halves: a handheld transmitter and a mobile receiver unit. On the control end, a joystick module is manipulated by the user to generate directional inputs, which are read by the first ATtiny13A microcontroller (running compiled C code from JoystickTx.C). This microcontroller processes the inputs and sends the command signals wirelessly using a 433MHz RF transmitter module. Power for the transmitter circuit is regulated steadily by an LM1117-5.0 fixed 5V voltage regulator connected to a 9V battery. On the robot itself, a 433MHz RF receiver module intercepts the wireless signals and passes them to the second ATtiny13A microcontroller (programmed using JoystickRx.C). Because the tiny microcontroller's logic outputs cannot directly power heavy loads, the decoded instructions are sent to an L293D motor driver IC. The L293D acts as a high-current interface that safely controls two 5V to 7.4V battery-operated geared motors (M1 and M2). These motors draw their primary operating energy from a separate 7.4V lithium-ion or lithium-polymer battery, which is also regulated to 5V via another LM1117-5.0 regulator (IC3) to keep the logic components properly powered. By coordinating the joystick positions with the dual microcontrollers and RF link, the robot can wirelessly move forward, backward, and turn in response to the user's physical commands.