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boards:nano [2015/01/06 20:21] – darronboards:nano [2016/07/21 18:43] (current) – external edit 127.0.0.1
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-==== Nano 3.0 Clone with CH340G USB UART ====+==== Nano 3.0 ====
 <wrap right> <wrap right>
 {{:boards:nano.jpg?200}} {{:boards:nano.jpg?200}}
 </wrap> </wrap>
 +
 +This example is a clone with a [[interfaces:ch340g|CH340G USB UART]].
 +
 +These clones are very cheap and are nano 3.0 compatible with an ATMEGA328P micro-controller and 16 MHz XTAL.
  
 === Pinout === === Pinout ===
 <code> <code>
-               ----------------+               +--------------+ 
 +               |   5 3 1 ISP  | 
 +               |   6 4 2      | 
 +               |  RX TX PW L  |
 D1 TX         1|   PD0        |30 VIN D1 TX         1|   PD0        |30 VIN
 D0 RX         2|   PD1        |29 GND D0 RX         2|   PD1        |29 GND
-RESET         3|              |28 RESET+RESET         3|     RESET    |28 RESET
 GND           4|              |27 5V GND           4|              |27 5V
 D2 INT0       5|   PD2 ADC7   |26 A7 D2 INT0       5|   PD2 ADC7   |26 A7
Line 22: Line 29:
 D11 MOSI     14|   PB3        |17 3V3 D11 MOSI     14|   PB3        |17 3V3
 D12 MISO     15|   PB4 PB5    |16 D13 LED SCK D12 MISO     15|   PB4 PB5    |16 D13 LED SCK
-               ----------------+               +--------------+
 </code> </code>
  
-=== Resources === +=== Power === 
-[[interfaces:ch340g|USB UART]]+This device is either powered from the USB bus of from VIN which feeds a 5V LDO regulator. 
 + 
 +The V3 pin on the CH340G (4) is used to generate the external 3V3 power on pin 17. Chip documentation suggests that this pin was not designed for this task and its maximum current capability is unknown. 
 + 
 +=== Communications === 
 + 
 +Communications is via the built-in CH340G usb to serial bridge. This device can achieve 115200 baud. 
 + 
 +=== Boot loader === 
 + 
 +An arduino boot loader is present on this device by default running at 57600 baud. Installation of [[:tools:optiboot|Optiboot]] is recommended to increase this speed to 115200. 
 + 
 +=== ISP === 
 + 
 +A 6-pin ATMEL ISP header is present. This will require an ISP adapter for the [[:interfaces:usbasp|USBasp]]. 
 + 
 +<code> 
 +D12 MISO PB4 |1 2| VDD 
 +D13 SCK  PB5 |3 4| D11 MOSI PB3 
 +RESET        |5 6| GND 
 +</code>