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Stuff related to MAV's (and UAV's) from a hobbyist's point of view. Info

Did you know that...

The PWM-pulse used to control an RC-servo doesn’t need to be at the same voltage-level as the servo’s supply current (5V)! Using any voltage between 3V and 6V is perfectly fine for the NE555 driver chip.

Damn if I knew this before it would have saved me quite some time (and pull-up resistors and buffers) on my autopilot module!

8 October 2008, 21:20 | Link |

  1. I had the same problem – to link ARM 3.3V PWM output directly to servos. With Hitec analog servos it works perfectly.

    I also checked the output of Hitec RC receiver with oscilloscope – the pulse was also 0 to 3.3V. It is possible to link this pulse directly to Input Capture timer in 3.3V microcontroller and it works.


    — wasilak, 10 October 2008, 10:37 | #


  2. Tom,

    I think you meant … NE544… and not NE555
    CU
    Marc


    — Marc Gerin, 12 October 2008, 15:00 | #


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