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boards:rkat28sb [2015/01/09 17:31] – darronboards:rkat28sb [2024/07/10 12:24] (current) – external edit 127.0.0.1
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-==== RK Education RKAT28sb ====+==== RKAT28sb ====
 <wrap right> <wrap right>
 {{:boards:rkat28sb.jpg?200}} {{:boards:rkat28sb.jpg?200}}
 +\\ \\
 +{{:boards:rkat28sb2.jpg?200}}
 </wrap> </wrap>
  
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 0V 0V
-0V                AD4 SDI +0V           PC5  AD5 SCL 
-5V                AD4 SDA+5V           PC4  AD4 SDA
 RX                   AREF RX                   AREF
 TX                    GND TX                    GND
-DTR               D13 SCK +DTR          PB5 D13  SCK 
-                 D12 MISO      +             PB4 D12 MISO      
-RST              D11 MOSI +RST          PB3 D11 MOSI 
-+3V3                  D10 ++3V3            PB2   D10 
-+5V                    D9 ++5V             PB1    D9 
-GND                    D8+GND             PB0    D8
 GND GND
-VIN                    D7 +VIN             PD7    D7 
-                       D6 +                PD6    D6 
-AD0                    D5 +AD0 PC0         PD5    D5 
-AD1                    D4 +AD1 PC1         PD4    D4 
-AD2                    D3 +AD2 PC2         PD3    D3 
-AD3                    D2 +AD3 PC3         PD2    D2 
-AD4 SDA             D1 RX +AD4 SDA PC4     PD1 D1 TX 
-AD5 SCI  246  RESET D0 TX +AD5 SCL PC5     PD0 D0 RX 
-         135 + 
-         ISP+        246   RESET 
 +        135 
 +        ISP 
 +         
 +NB ISP orientation is not Arduino UNO compatible
 </code> </code>
 +
 +=== Power ===
 +
 +This device can be powered by either the pins on the serial port or via the DC input jack. In either case the MCU can be provided with 3V3 or 5V. The jack feeds two LDO regulators which may be set via a jumper to select the required voltage.
 +
 +The kit comes with a 16M resonator but I have installed a 16 MHz XTAL. The MCU is not rated to run at 16M using 3V3 but this configuration works fine for me.
 +
 +=== Communications ===
 +A [[:interfaces:cp2104|cp2104]] serial module is well suited to connect to the RKAT28sb with its built-in capacitor on DTR and is able to supply both 3V5 and 5V for VCC. The photo. top right, shows a cp2104 module connected.
 +
 +=== Boot loader ===
 +This kit doesn't come with a chip and therefore no boot loader. The processor I bought was blank but has been programmed with [[:tools:optiboot|Optiboot]].
 +
 +
 +=== 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>
 +
 === Resources === === Resources ===
-[[http://www.rkeducation.co.uk/documents/instructions/RKAT28sbComponentListandInstructions.pdf|Constructors guide with schematic]]\\+{{downloads:RKAT28sbComponentListandInstructions.txt|Constructors guide}} 
 + 
 +{{downloads:rkat28sbschematic.pdf|Schematic}}