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function cmd_analog_out(h,pin_no,val)
// Command to sent out analog signal to a connected Arduino board
//
// Calling Sequence
// cmd_analog_out(h,pin_no,val)
//
// Parameters
// h : Board number, reserved for future use. For this version, any number would do
// pin_no : Digital pin with ~ to sent the signal
// val : The value of 0-255 to be sent to the digital pins with ~ sign. It will be then scaled to 0-5V
//
// Description
// The analog outputs of the Arduino Uno is available at the pins 3,5,6,9,10 and 11, while on the Mega board, the outputs are on pins 1-13 and 44-46.
// It is a bit misleading to use the term "analog output", because in order to generate this output while minimizing energy losses,
// the Arduino uses PWM (Pulse Width Modulation) available on these ports. By varying the duty cycle of the PWM is altered the average
// voltage across the component connected to this port, which has the effect of having a analog output voltage.
//
// The input port accepts the value from 0 to 255 which is correspoding to the duty cycle of 0 to 100%. In other words, sending 0 to the block will generate 0 V output at the port, 127 generates 2.5V and 255 generates 5V. (the port is 8 bits, so the resolutions of output would be 2^8 =256).
//
// Examples
// ok = open_serial(1,9,115200)
// cmd_analog_out(1,9,100)
// close_serial(1)
//
// See also
// cmd_analog_out_volt
// cmd_arduino_a_control
//
// Authors
// Bruno JOFRET, Tan C.L.
//
if val > 255 then
val = 255;
elseif val < 0
val = 0;
end
code_sent="W"+ascii(48+pin_no)+ascii(abs(ceil(val)));
write_serial(h,code_sent,3);
endfunction
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