DT006 AVR Development Board

• The "Newbies" entry into MicroControllers
• Versatile Hardware & Free Software.
• Many "Older" Engineers learn from this - it's more cost effective than anything else going. 

  

The DT006 board will program the AVR 8, 20, and 28 pin DIP chips on board, and will also program the DT103 & DT104 AVR SimmSticks, as well as any AVR target board that has a Kanda type header, however current burning software is achieved with the programmer software built into Bascom-AVR. Have a read through Bascom-AVR documentation for chip types supported.

This means, after you have this programmer unit up and running as a development platform, all you need to duplicate the procedure with a stand alone micro, is a single AT90S2313-10-PC micro, and a DT104 PCB and a handful of simple components. Or you can use your own circuit design on a proto board, vero board, your own artwork, whatever.

These things absolutely scream along. By comparison, a 10Mhz AVR micro executes instructions at twice the speed of the 20Mhz PICmicro based BSII, and that's just the micro. As BASCOM-AVR  is compiled Basic, and not tokenized into a serial EEPROM like the BSII is, you have just speed it up by another factor of about 15-20 times.

Download Schematic

Parts List

These assembly instructions are aimed at getting a minimum development system running with a 20 pin AT90S2313-10-PC  working, in conjunction with the  runavr project software, which is a free, demo, fully featured, (not crippled) Basic Compiler. The only limitation is the 2K code size, however this just happens to be the same size as the AT90S2313 code space.

Power Supply Section

PCB   1 x DT006A

VR1   1 x 7805 +5 Voltage regulator in TO-220 case.
      1 x Suitable heat sink for above Regulator.
D1    1 x Diode Bridge D1 WO2 (or WO4 type)
J4    1 x 2.5mm (or 2.1mm) DC Input plug. PCB mount.

C1    1 x Capacitor 1000uf Electrolytic @25 Volts. (PCB type mount.)
C2    1 x Capacitor .01uf (or .1uf) Ceramic or Monolithic
C3    1 x Capacitor 10uf Electrolytic (PCB mount.) or Tant. @16 V.
C4    1 x Capacitor .01uf (or .1uf) Ceramic or Monolithic

LED10 1 x 3mm LED. PWR monitor
R15   1 x Resistor 1K .25 watt

U3    1 x AT90S2313-10-PC 10Mhz 20 pin DIP
X1    1 x 10Mhz 3 leg resonator.

A 10Mhz Crystal and two 22pf ceramic Caps can be fitted
as an alternative to X1. The caps are installed at locations C9 and C10
Don't fit the caps if you are installing the resonator.
(15-30pf are suitable, resonators have 30pf caps internal)

A 20 pin machine pin socket should be fitted to the U3 location.
This will enable this Micro to be removed, if an 8 or 28 pin micro is
to be installed.

A 3 pin machine pin socket, or strip, can be used for the X1 location.
This will allow you to fit other value resonators.
If you can't find a strip, a 3 pin one can be cut from a
machine pin socket.

J7    1 x DB-25 Male right angle PCB mount connector.
R2    1 x Resistor  330R .25 watt
R3    1 x Resistor  330R .25 watt
R4    1 x Resistor  330R .25 watt

SW1   1 x 4 leg push-button Switch.
C12   1 x Capacitor 4.7uf to 10uf Tantalum.
R17   1 x Resistor  10K .25 watt

Serial Communications Section

U1    1 x MAX-232 E2 (or equivalent)
      You may chose to use a 16 pin socket for the Max-232

C5    1 x 1uf Electrolytic or Tantalum cap for Max-232.
C6    1 x 1uf Electrolytic or Tantalum cap for Max-232.
C7    1 x 1uf Electrolytic or Tantalum cap for Max-232.
C8    1 x 1uf Electrolytic or Tantalum cap for Max-232.
J6    1 x DB-9 right angle PCB mount connector.

Input/Output Section

R1     1 x Resistor  1K .25 watt
R14    1 x Resistor  1K .25 watt
SW2    1 x 4 leg push-button Switch.
SW3    1 x 4 leg push-button Switch.

R6-R13 1 x RN1 1K resistor network. 10 pin device.
            1 common pin. (10P9R-1K)
Alternatively, if a resistor network is difficult to source,
this could be 8 individual resistors installed standing
upright on the board.

LED2-9 8 x 3mm LEDs. 
J9     1 x set of male header pins at .1" centers. (8 x 2 format)
TL8    8 x .1" test links.

4 x 12mm square .5" stick on rubber feet. Adds a nice finish.

Optional Items (not needed to get the basic unit going)

Kanda Compatible Connector:

J10   10 pin IDC Connector. (2 x 5 male header).
LED1  1 x 3mm LED.
R5    1 x Resistor  1K .25 watt

AVCC: (Used for D/A on 28 pin AVR Micros)

C11   1 x Capacitor .1uf (100nf) Ceramic
R16   1 x Resistor 100R .25 watt

Extension of SimmStick Bus:

J1    1 x 30 pin female R/A header strip.
J2-3  1 x dual 30 pin Simm Socket.

J1 Will allow you to very simply connect to a proto or vero board for outboard development.
J2-3 As you will find, you generally can't get two SimmSticks into two adjoining Simm Sockets unless all components are surface mounted, so you would normally use the J3 position for a SimmStick. As single and dual sockets are about the same price, we have allowed for a dual to be used in this position.

Additional Jumper Options:

J5     Serial in/out crossover to Simm Bus.
       4 pin (2 x 2) header. Two Links.
       To be able to use serial comms to a SimmStick via the Simm Bus,
       you will have to link J5 correctly. For direct connection,
       link pin 1 to pin 2, and pin 3 to pin 4. This means the links
       must be horizontal. To swap the RX/TX signals, simply position
       them vertical.

J8     4 pin (2 x 2) header. Unused signals of Max-232. Not used.

J11-12 2 x 3 pin headers. Two test links. Used to configure
       Int/Ext OSC pins of an 8 pin Micro. Extends to Simmbus.

J13    1 x 3 pin header. 1 test Link. Configure AREF to VCC
       for 28 pin micro.

J14    MOSI/MISO in/out crossover to Simm Bus.
       4 pin (2 x 2) header. Two Links.
       To be able to program a SimmStick via the Simm Bus,
       you will have to link J14 pin 1 to pin 2,
       and J14 pin 3 to pin 4. This means the links must be
       horizontal, or point towards the Simm socket.
       If you need to swap these signals, simply position
       them vertical.

Alternative Micros:

U2     Used for  8 pin micro installation.
U4     Used for 28 pin micro installation.

Assembly Instructions

• All the positives of  polarized capacitors point to the top of the board.
  
• All LEDs have the anode to the top of the board. The cathodes have a flat edge on one side of the plastic, this points towards the bottom of the board.
  
• Items like switches that can be inserted into the board in two, and sometimes 4 different ways, we have run the tracks, so that it doesn't matter which way you install them.
  
• Four poster header pins and Links. The artwork has been done so that installing links in the horizontal or vertical position, will logically cross over the connection.
  
• All options at link positions have the links factory set to open. THis way you put in links rather than cut tracks.
  
• The resistor network, should be a 9 pin for 8 resistors, but you can't get them, so it's a 10 pin device. You will see an extra dummy hole at one end of the artwork at this position to allow for this. Again, we have connected +5V to this dummy hole so it doesn't matter which way it is installed, as long as it is a 9 resistor network. We have also allowed for 8 individual resistors to be installed if you have trouble getting a resistor network. This means standing the resistors up from the board, so that one leg is bent over the body of the resistor. The 8 resistors are placed into 2 holes in the vertical position, so that one end of each resistor connects to +5V.

Install The Components

Install the crystal 3 pin socket, and the 20 pin machine pin socket into the U3 position. Install a 16 pin socket for U1 if you wish to. This may be a good choice for a beginner.
Instead of saying "Install this into that" here is the general order of the rest of installation procedure:

Resistor Network (10P9R-1K). Alternatively, if a resistor network is difficult to source, this could be 8 individual resistors installed standing upright on the board.

Resistors R1-1K, R2-330R, R3-330R, R4-330R, R14-1K, R15-1K, and R17-10K.
C2-Capacitor .01uf (or .1uf) Ceramic
C3-Capacitor 10uf Electrolytic (PCB mount.) or Tant. @16 V.
C4-Capacitor .01uf (or .1uf) Ceramic
C5-Capacitor 1uf Electrolytic or Tantalum cap for Max-232.
C6-Capacitor 1uf Electrolytic or Tantalum cap for Max-232.
C7-Capacitor 1uf Electrolytic or Tantalum cap for Max-232.
C8-Capacitor 1uf Electrolytic or Tantalum cap for Max-232.
C12-Capacitor 4.7uf to 10uf Tantalum.
LED 2 to LED 9 (8) 3mm.
LED 10 3mm.

This pretty well covers the low profile components, so the order of the rest of the items isn't all that important.

Components Left To Install:

C1-1000uf Electrolytic @25 Volts
VR1-7805 +5 Voltage regulator in TO-220 case, 
    and Suitable heat sink for the Regulator.
D1-Diode Bridge D1 WO2 (or WO4 type)
J4-2.5mm (or 2.1mm) DC Input plug. PCB mount.
J6-DB-9 right angle PCB mount connector.
J7-DB-25 Male right angle PCB mount connector.
SW1-4 leg push-button Switch.
SW2-4 leg push-button Switch.
SW3-4 leg push-button Switch.
J9-Set of male header pins at .1" centers. (8 x 2 format)

Final Touch:
4 x 12mm square (or round) .5" stick on rubber feet. Adds a nice finish. Stick in the four corners of the solder side of the DT006 board.

Micros and Configuration

Install:

U3-AT90S2313-10-PC 10Mhz 20 pin DIP
X1-10Mhz 3 leg resonator.
U1-MAX-232 E2 (or equivalent)

TL8- 8 x .1" test links. These are installed on the J9 header posts.
In order to get all 8 LEDs to flash, all 8 links will need to be installed, however as Data signals D5, D6, and D7 (the last 3 links) may upset the programming signals, you will need to remove these 3 links, and sit them over just one pin of the header, not 2 pins, during the programming phase.

Initial Power up and Testing

1. Remove the micro if you have it installed.
2. Install the links installed for the first 5 LED positions on the J9 header pins.
3. Leave D5,  D6, and D7 links out. These are the 3 links nearest the Simm Socket.
4. Power the unit up via your plugpack or wall wart.
5. If all is well, the power LED, LED by the power socket will light up.
6. Press switch 2, then switch 3, these should make Data LEDs 3 and 4 light up.

Check the heat sink for excessive heat. It should be mildly warm. If you have a multi-meter, you can check for +5V on the board. If the power LED is on and stable, this is a pretty good indication that the power section is alive and well.

Testing RS-232 I/O

You can now check the RS-232 section by hooking up the DB-9 connector to a comms port on your PC and running a terminal program such as hyperterm under W9x, etc.
You must put a short between pins 2 and 3 of the micro at the 20 pin socket location. If you have used a machine pin socket, it's easy to push a resistor leg, or low value resistor (100R or less) into the socket. What you type into the comms program, should be "echoed' back to you with the link installed. Removing the link should stop this echo. You can check this at any speed, any data format, just make sure you have the correct comms port.

We are rushing DT006 boards to Mark, the Author of Bascom-AVR, so he can put together a very nice piece of testing software for this board, in the meantime, you can try testing with "rotate.bas" for the LEDs and "strings.bas" for RS-232 testing. The method of programming using Bascom-AVR is covered in the runavr link listed below.

Software Development & Programming

Download the free Bascom Compiler from www.mcselec.com/download.htm 

For lots of detail about the compiler, check out: Bascom-AVR

An overview of programming a chip (with pictures) is covered in the runavr project pages.

DT006 Test Program - dt006_1.zip

DT103 40pin Atmel CPU SimmStick

DT104 20pin Atmel AVR and 2051 SimmStick

DT004 Printer Port I/O motherboard

and in fact check out all of the SimmStick info.