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--- arduino:diy_ardunio:start [2015/03/19 17:26] – [Uploading sketches] mithat
+++ arduino:diy_ardunio:start [2016/08/28 18:26] – [KiCad subcircuit] mithat
@@ Line 32: / Line 32: @@
 I think a better approach is to buy an inexpensive USB to serial cable/adapter. Apparently, it can't be just any old serial to USB adapter; the Arduino needs to be reset by the host when new sketches are uploaded, and it appears the serial DTR pin is used for this.((http://blog.tarn-vedra.de/posts/using-cp2102.html)) So, //make sure the board you buy has a DTR output.//
-The classic chip for USB to serial conversion is the FTDI FT232RL((Beware of counterfeits! See [[http://hackaday.com/2014/02/19/ft232rl-real-or-fake/|this]] and [[http://www.eevblog.com/forum/reviews/ftdi-driver-kills-fake-ftdi-ft232/|this]]!)). I believe these were used in earlier Arduinos. [[http://arduino.cc/en/uploads/Main/Arduino_Uno_Rev3-schematic.pdf|Recent Unos]] use an ATmega16U2-MU with custom software.
+The classic chip for USB to serial conversion is the FTDI FT232RL((Beware of counterfeits! See [[http://hackaday.com/2014/02/19/ft232rl-real-or-fake/|this]] and [[http://www.eevblog.com/forum/reviews/ftdi-driver-kills-fake-ftdi-ft232/|this]]!)). I believe these were used in earlier Arduinos. [[http://arduino.cc/en/uploads/Main/Arduino_Uno_Rev3-schematic.pdf|Recent Unos]] use an ATmega16U2-MU with custom software. Note that the FTDI FT232RL requires custom drivers on Windows---ones that may [[http://www.eevblog.com/forum/reviews/ftdi-driver-kills-fake-ftdi-ft232/|brick the unit]] if the driver thinks the chip is a fake! There are some low cost alternatives to the FT232RL that promise to work as well and may have better driver support (depending on your platform).
-Note that the FTDI FT232RL requires custom drivers on Windows--ones that may [[http://www.eevblog.com/forum/reviews/ftdi-driver-kills-fake-ftdi-ft232/|brick the unit]] if the driver thinks the chip is a fake! There are some low cost alternatives to the FT232RL that promise to work as well and may have better driver support (depending on your platform).
 Some options for USB to serial adapters appear to include:
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   * Arduino's own [[http://arduino.cc/en/Main/USBSerial|USB Serial Light Adapter]] (Atmega8U2-based)
   * SparkFun's [[https://www.sparkfun.com/products/9716|FTDI Basic Breakout]] or [[https://www.sparkfun.com/products/11736|FT231X Breakout]] (FT232RL-based)
-  * CP2102-based boards like [[http://www.ebay.com/itm/6Pin-USB-2-0-to-TTL-UART-Module-Serial-Converter-CP2102-STC-Replace-Ft232-Module-/400565980256?pt=LH_DefaultDomain_0&hash=item5d4397cc60|this one]].
+  * CP2102-based boards like [[http://www.ebay.com/itm/CP2102-USB-RS232-TTL-Adapter-5V-3-3V-for-Arduino-5-Pin-Linux-MAC-US-SHIP-/181538880234?pt=LH_DefaultDomain_0&hash=item2a448f7aea|this one]] or [[http://www.ebay.com/itm/6Pin-USB-2-0-to-TTL-UART-Module-Serial-Converter-CP2102-STC-Replace-Ft232-Module-/400565980256?pt=LH_DefaultDomain_0&hash=item5d4397cc60|this one]].
   * CH340-based boards like[[http://www.ebay.com/itm/Replace-PL2303-USB-TO-TTL-232-RS232-Serial-Port-CH340-for-Arduino-PIC-AVR-Modbus-/281097665582?pt=LH_DefaultDomain_0&hash=item4172b9fc2e|this one]].
-The CH340 in particular seems to be taking off with Arduino clone makers--possibly because it's both cheap and has no dramatic driver issues on Windows. However, sourcing the proper CH340 drivers seems to be a bit muddled and not exactly confidence inspiring.
+The CH340 in particular seems to be taking off with Arduino clone makers---possibly because it's both cheap and has no dramatic driver issues on Windows. However, sourcing the proper CH340 drivers seems to be a bit muddled and not exactly confidence inspiring.
 ^ IC      ^ I/O  ^ Linux driver ^ Windows driver   ^ MacOS driver ^
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 |DTR              | Reset, through a 100nF capacitor* |
-*The reset pin on the microcontroller should have a 10K pullup resistor on it. The 100nF capacitor takes the adapter's DTR output and converts it into a pulse. The [[https://cdn.sparkfun.com/datasheets/Dev/Arduino/Boards/Arduino-Pro-Mini-v14.pdf|Arduino Pro Mini]] has both these already in place, so you can connect the adapter's DTR to the Pro Mini's DTR header pin directly.
+*The 100nF capacitor takes the adapter's DTR output and converts it into a pulse. The reset pin on the microcontroller should also have a 10K pullup resistor on it. The [[https://cdn.sparkfun.com/datasheets/Dev/Arduino/Boards/Arduino-Pro-Mini-v14.pdf|Arduino Pro Mini]] has both these already in place, so you can connect the adapter's DTR to the Pro Mini's DTR header pin directly.
 As far as I know, you can use the Arduino IDE to upload sketches as normal with this setup.
-This video is instructive.
+This video is instructive:
 {{youtube>Vawhrr4COjI}}
+===== KiCad subcircuit =====
+For (temporary?) safe keeping, here's a hierarchical [[Arduino Uno subcircuit]] for incorporating a DIY-Arduino in a PCB design. It requires some of my [[https://gitlab.com/mithat/kicad-components-mfk|KiCad libraries]].
 ===== Some references =====