Control RC-Car with PC
For controlling a Car with a pc I build a simple little hardware with an Atmel Mega 8 microcontroller, a Max232 (Serial Port Voltage converter) and some resistors and capacitors.
The microcontroller receives simple controlmessages from the pc, like Servonumber (1-6) Servoposition (1-255) and a 0 as end of command.
The Timer1 of the microprocessor generates the ppm Signal for the radio which has an input conector for a pupil signal. The program is written in C and is rather simple. An array of 16x2 values defines the preload values for the timer1.
lValue = 8199
lValue = 0
lValue = 5000
lValue = 1
and so on.
The first field contains the timer1 preload, the second one if the output is high or low. So, it needs only a very little computation time, everything is controlled by interrupts, even the serial port.
As radio I used the DX-6 a 2,4 Ghz transmitter. I removed the pushbutton for the trainer mode and replaced it with a normal switch so that I have my hands free.
(c) Schoeppl.info - Last modified: 19.12.2006