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Program for a STM32F4 board in CoIDE transmit voltage to a PIN HELP

Question asked by stone.jorge on Feb 11, 2015
Latest reply on Feb 11, 2015 by stone.jorge
Hello, i want to program a STM32F4 board in CoIDE so it can transmit a voltage to a pin and then stop for a while and then again transmit voltage to the pin. I want to program the board so it can send periodically voltage to a ultrasound transducer. It has to do something like this:

Can someone help me please? I have programmed easy things like turning on the leds but i'm stuck for doing this.

Thank you very much