I have a 20A ESC, I have connected it to the brushless dc motor as shown in picture. When i apply a 1ms + signal with rate of 50hz it produces beeps but doesn do any thing. i have connected the wire to mc as; the red one to +5 black to gnd, and white to MC for apply pulse. where am i doing it wrong.enter image description here

enter image description here

  • \$\begingroup\$ I have the same one , you have to calibrate it first also it has a safety feature that don't let you start the motor unless you start with the lowest frequency \$\endgroup\$ – Chebhou May 5 '15 at 16:28
  • \$\begingroup\$ how have you started it to work. please give me your \$\endgroup\$ – Bilal Ayub May 5 '15 at 17:01
  • \$\begingroup\$ the delay function in c language \$\endgroup\$ – Bilal Ayub May 5 '15 at 17:02
  • \$\begingroup\$ sorry not in C just a test run with arduino \$\endgroup\$ – Chebhou May 5 '15 at 17:03
  • \$\begingroup\$ ok you can give me a delay function in ms \$\endgroup\$ – Bilal Ayub May 5 '15 at 17:06

The ESC is likely treating the length of a control pulse at power-on as zero throttle (for safety). Change the pulse to 1500 us after ESC stops beeping and it should start your motor.

  • \$\begingroup\$ ok let me check this \$\endgroup\$ – Bilal Ayub May 5 '15 at 16:19
  • \$\begingroup\$ sir, i think i have problems in my delay function, void delay(unsigned int itime) { unsigned int i,j; for (i=0;i<itime;i++) // this is For(); loop delay used to define delay value in Embedded C { for (j=0;j<1200;j++); } } \$\endgroup\$ – Bilal Ayub May 5 '15 at 16:21
  • \$\begingroup\$ please give me a proper millisecond delay function \$\endgroup\$ – Bilal Ayub May 5 '15 at 16:22
  • \$\begingroup\$ this is not relevant to the question \$\endgroup\$ – Oleg Mazurov May 5 '15 at 19:39
  • \$\begingroup\$ ok i have done what you have said, but nothing changed. \$\endgroup\$ – Bilal Ayub May 6 '15 at 8:10

Most (if not all) ESCs expect a short pulse at power up. Set it initially to 900us and wait until the beeps stop (~3 seconds).
A long pulse (~1500us) at power up will get the ESC into the programming mode.


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