Instructions

337 C-Control Pro IDE

// Power on -> SD-Card

Port_WriteBit(14,1); // EN2 (PB.6) +5V

AbsDelay(50); // 50ms Pause

// SD-Card Fat init

SDC_Init (fat);

// Create a new file folders

SDC_MkDir("0:/CC-PRO");

// Does the file already exists?

// If the file is not created

res=SDC_FOpen(fil, "0:/CC-PRO/test.txt", FA_READ|FA_WRITE|FA_OPEN_EXISTING);

if(res!=0)SDC_FOpen(fil, "0:/CC-PRO/test.txt", FA_WRITE|FA_CREATE_ALWAYS);

// Writes to a text file

buf= "Hallo... 123!\r\n";

SDC_FWrite(fil, buf, Str_Len(buf), bytes_written);

SDC_FSync(fil);

// File is closed

SDC_FClose(fil);

}

5.22 Servo

RC servos are composed of a DC motor mechanically linked to a potentiometer. Pulse-width modu-

lation (PWM) signals sent to the servo are translated into position commands by electronics inside

the servo. When the servo is commanded to rotate, the DC motor is powered until the potentiometer

reaches the value corresponding to the commanded position. The servo is controlled by three wires:

ground (usually black/orange), power (red) and control (brown/other colour). The servo will move

based on the pulses sent over the control wire, which set the angle of the actuator arm. The servo

expects a pulse every 20 ms in order to gain correct information about the angle. The width of the

servo pulse dictates the range of the servo's angular motion. A servo pulse of 1.5 ms width will set

the servo to its "neutral" position, or 90°. For example a servo pulse of 1.25 ms could set the servo

to 0° and a pulse of 1.75 ms could set the servo to 180°. The physical limits and timings of the servo

hardware varies between brands and models, but a general servo's angular motion will travel some-

where in the range of 180° - 210° and the neutral position is almost always at 1.5 ms.

Connection to C-Control Pro