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Hi everyone, This is my special pet project. It is an example of how u can use autoit to control external devices. this script is made to comunicate with the MAX335 chip using the SPI protocol via the LPT(printer) port the beauty of the MAX335 chip is that the Clock, Data_In and the Chip_Select pins can be directly connected to the LPT port without any external components, and the 12V and 5V directly from an ATX PC power suply. aditionaly i made a custom GUI with CommandFusion instaled on an Android Tablet that sends TCP commands to an Autoit TCP server that controls three dasy chained MAX335 chips that totals 24 independent NO switches this script works perfectly for me i just finished this project and i think i will make an UDF including more SPI devices $DLLFileAndPath = @ScriptDir & "/inpout32.dll" Global $335_device_number=3 ;number of daisy chained chips Global $335_clock_bit=0 ;bit number for LPT pin 1 in the control Register of the LPT port(where i connected the CLK pin on te MAX335) Global $335_cs_bit=4;bit number for LPT pin 6 in the data Register of the LPT port(where i connected the CS pin on te MAX335) Global $335_data_in_bit=7;bit number for LPT pin 9 in the data Register of the LPT port(where i connected the DI pin on te MAX335) Global $clock_delay=1;this limits the clock speed but it works fine with 0 ;the ini file will be created and will keep the MAX335 pins statuses For $i=0 To $335_device_number*8-1 Step 1 IniWrite("355_buffer.ini","present_data",$i,"0") Next set_max335_output(2,3,1) ; this will activate switch 2 on device 3 on the daisy chain Func set_max335_output($output_no,$device_no,$status) $bit_no=($device_no-1)*8+$output_no-1 ; get the exact bit number of the switch IniWrite("355_buffer.ini","present_data",$bit_no,$status); whrite it to the buffer ;this part is where the SPI protocol begins set_control_bit($335_clock_bit,1); drop CLK set_data_bit($335_cs_bit,0) ;activate CS Sleep($clock_delay) For $i=$335_device_number*8-1 To 0 Step -1; start writing from buffer MostSignificantByte first $data=IniRead("355_buffer.ini","present_data",$i,"0") set_data_bit($335_data_in_bit,$data) ; set data bit value set_control_bit($335_clock_bit,0) ;raise CLK Sleep($clock_delay) set_control_bit($335_clock_bit,1); drop CLK Sleep($clock_delay) Next set_data_bit($335_cs_bit,1);deactivate CS EndFunc Func set_data_bit($bit,$stat=-1) ; it will write the value of the bit in the data reg of the LPT port $y= DllCall($DLLFileAndPath, "int", "Inp32", "int", "0x378") $bits=dec_to_bin($y[0]) If $stat = -1 Then If $bits[$bit]=0 Then $bits[$bit]=1 Else $bits[$bit]=0 EndIf $bcd=bin_to_dec($bits) DllCall( $DLLFileAndPath, "int", "Out32", "int", "0x378", "int", $bcd) Return 1 Else If $bits[$bit]<>$stat Then $bits[$bit]=$stat $bcd=bin_to_dec($bits) DllCall( $DLLFileAndPath, "int", "Out32", "int", "0x378", "int", $bcd) Return 1 Else Return 2 EndIf EndIf EndFunc Func set_control_bit($bit,$stat=-1); it will write the value of the bit in the control reg of the LPT port $y= DllCall($DLLFileAndPath, "int", "Inp32", "int", "0x37a") $bits=dec_to_bin($y[0]) If $stat = -1 Then If $bits[$bit]=0 Then $bits[$bit]=1 Else $bits[$bit]=0 EndIf $bcd=bin_to_dec($bits) DllCall( $DLLFileAndPath, "int", "Out32", "int", "0x37a", "int", $bcd) Return 1 Else If $bits[$bit]<>$stat Then $bits[$bit]=$stat $bcd=bin_to_dec($bits) DllCall( $DLLFileAndPath, "int", "Out32", "int", "0x37a", "int", $bcd) Return 1 Else Return 2 EndIf EndIf EndFunc Func dec_to_bin($dec) Local $bit_array[8] If $dec > 255 Then SetError(1,1,-1) If $dec < 0 Then SetError(2,1,-1) For $i=7 To 0 Step -1 If $dec >= 2^$i Then $bit_array[$i] = 1 $dec=$dec-2^$i Else $bit_array[$i] = 0 EndIf Next Return $bit_array EndFunc Func bin_to_dec($bit_array) If IsArray($bit_array) Then If UBound($bit_array) = 8 Then $dec=0 For $i=7 To 0 Step -1 $dec = $bit_array[$i]*(2^$i)+$dec Next Else SetError(2,1,-1) EndIf Else SetError(1,1,-1) EndIf Return $dec EndFunc