Changes between Version 7 and Version 8 of DiyIcsAdaptors

Timestamp:

05/12/10 20:03:08 (14 years ago)

Author:

pinwc4

Comment:

--

DiyIcsAdaptors

@@ -9 +9 @@
 To keep the design simple we will use an already existing USB to Serial TTL adapter and use a diode to bridge the transmit and receive lines to 1 wire.  USB Serial to TTL adapters will get the voltage level close to where we need it for the Kyosho PCB's.  Since the dNaNo operates at 3.7 volts it is safest if we get our TTL voltage down to that level or below.  
 
-Using transistors to bridge the transmit and receive lines together would be a better design since by using a diode we will get an echo of all the transmitted data back to the computer.  The Flip Side ICS Software will ignore this echoed data so it is not a concern.  The diode will also drop the voltage level by approximately .7 volts.  This allows us to start with a 5 volt USB to TTL adapter and use 2 diodes to get the voltage to 3.6 volts, right around the same voltage as the dNaNo.  A 3.3 volt TTL adapter can also be used but use only 1 diode in that case.  The Mini-Z and dNaNo boards will communicate at lower voltages but going over there voltage limits could create problems.
+Using transistors to bridge the transmit and receive lines together would be a better design since by using a diode we will get an echo of all the transmitted data back to the computer.  The Flip Side ICS Software will ignore this echoed data so it is not a concern.  The diode will also drop the voltage level by approximately .7 volts.  This allows us to start with a 5 volt USB to TTL adapter and use 2 diodes to get the voltage to 3.6 volts, right around the same voltage as the dNaNo.  It may be possible that A 3.3 volt TTL adapter can also be used but use only 1 diode in that case.  The Mini-Z and dNaNo boards will communicate at lower voltages but going over there voltage limits could create problems.
 
 Overall this design allows us to build a USB to ICS adapter with a minimal amount of parts.
@@ -21 +21 @@
 
 === 3.3 volt USB to TTL adapter ===
-Below is a schematic based on a 3.3 volt USB to TTL adapter.  Notice the use of 1 diode, this brings the voltage level down to approximately 2.6 volts.  Click on the image to see a larger version.
+Below is a schematic based on a 3.3 volt USB to TTL adapter.  I have not attempted to use a 3.3 volt TTL device so I do not know if this will work.  Notice the use of 1 diode, this brings the voltage level down to approximately 2.6 volts.  Click on the image to see a larger version.
 [[Image(//images/schematics/icsusbschematic.png, 25%, title=3.3 volt USB to TTL adapter)]]
 
@@ -44 +44 @@
 You will need to also choose one of the following USB to Serial TTL adapters.
 
-[http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=768-1029-ND 5V FTDI TTL to USB Convertor, wire end (use 2 diodes with this one)]
+[http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=768-1029-ND 5V FTDI TTL to USB Convertor, wire end (I have successfully built this using 2 diodes with this one)]
 
-[http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=768-1016-ND 3.3V FTDI TTL to USB Convertor, wire end (use 1 diode with this one)]
+[http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=768-1016-ND 3.3V FTDI TTL to USB Convertor, wire end (Unverified design, use 1 diode with this one)]
 
 There are other versions of this adapter available with different types of connectors such as a 3 pin audio jack or a .1" pin connector.  If you search for TTL-232R you will find the various versions of the FTDI adapter.