I have a servo (TowerPro sg90) connected to 32 servo controllers ( this one ) via a UART interface (RX-TX, GND-GND). The seller provides documentation on how to connect and control my servomotors, but this does not work.
Servo, if I indirectly connect it to the Arduino. The controller indicates that it works too (the picture below is a red LED).
I have already tried different servomotors. Also try using the provided software to control the servos from a PC through a Mac / PC. But the interface is not readable to me. I tried different options, but the servos did not respond.
Sketch code below (from sellers examples):
void setup() {
Serial.begin(9600);
}
void loop() {
Serial.print("#3P500T2000\r\n");
delay(2000);
Serial.print("#3P1500T2000\r\n");
delay(3000);
Serial.print("#3P2500T2000\r\n");
delay(2000);
Serial.print("#3P1500T2000\r\n");
delay(2000);
}
Photos of my connections:

, , Google.