89C2051 PCB

HSETI1 PCB: An 89C2051 CPU, 8 driver ouputs (e.g. LEDs, relays), a speaker output, a light sensor input, 3 extra inputs, optional serial port, small simple PCB.

PCB Artwork

The PCB art, overlay, is pictured above.

This image is a .GIF file saved at 300dpi. Most browsers can be instructed to download and save this image quite easily - for instance with Netscape, you right click on the image, then choose "save image as...". As the image is saved at 300dpi, a standard resolution of laser printers, you can print it out directly onto transparent film for making your own PCBs, and the scale will be substantially correct.

The overlay diagram is used for the silkscreen (legend) of the circuit board

The PCB art, top layer, is pictured above.

The top layer diagram is used for the tracks that go on the component side of the circuit board.

The PCB art, bottom layer, is pictured above.

This image is a .GIF file saved at 300dpi. Most browsers can be instructed to download and save this image quite easily - for instance with netscape, you right click on the image, then choose "save image as...". As the image is saved at 300dpi, a standard resolution of laser printers, you can print it out directly onto transparent film for making your own PCBs, and the scale will be substantially correct.

The bottom layer diagram is used for the tracks that go on the solder side of the circuit board. The layer is printed as if you are viewing through the circuit board (this is a convention used so that the layers line up) and will have to be reversed left-for-right before the copper tracks are printed.

HSETI PCB Art - Hole drilling diagram

The PCB art, hole drilling diagram, can be obtained through the above link. The hole diagram is also saved as 300 dpi, but is usually not used to make a to-scale diagram.

HSETI PCB Art - Protel format CAD file

The PCB art, in protel CAD format, can be obtained through the above link.

Parts List

HSETI1.PCB  19:51  10-9-1996	  PCB Parts List

A1		   (C)1996			       LOGO1
C1		   2.2UF50VMM			       RB.06/.15
C2		   100UF 16V			       RB.1/.2
C3		   22UF 			       RB.1/.2
D1		   5.6V 0.3W			       DIODE0.3
IC1		   AT89C2051			       DIP20
IC2		   ULN2803A			       DIP18
L1						       TP
L2						       TP
L3						       TP
L4						       TP
L5						       TP
L6						       TP
L7						       TP
L8						       TP
LANODE1 					       TP
LANODE2 					       TP
SPKR1						       TP
SPKR2						       TP
PCBLAM# 	   AB9609231			       PCLAMINATE
R1		   27E				       AXIAL0.4
R2		   27E				       AXIAL0.4
R3		   27E				       AXIAL0.4
R4		   27E				       AXIAL0.4
R5		   27E				       AXIAL0.4
R6		   27E				       AXIAL0.4
R7		   27E				       AXIAL0.4
R8		   27E				       AXIAL0.4
R9		   10K				       AXIAL0.4
R12		   10K				       AXIAL0.4
R13		   10K				       AXIAL0.4
R10		   1K				       AXIAL0.4
R11		   100E 			       AXIAL0.4
SKT1		   ICSOCKET			       DIP20
SW1		   TV-06A			       TV-06A
SW2		   S2020			       S2020SMT
T1		   BAT+ 			       TP
T2		   BAT- 			       TP
T3		   P35				       TP
T4		   INT1 			       TP
T5		   P34				       TP
T6		   TXD				       TP
T7		   RXD				       TP
TR1		   MEL12			       TO-92A
TR2		   BC547			       TO-92A
TR3		   BC327			       TO-92A
VR1		   100K 			       VR4
XTAL1		   3.57945MHZ			       XTAL2
Total Components = 48

Parts description

RB.06/.15: Radial polarised capacitor, 0.060 inch pitch lead space, 0.15 inch diameter
RB.1/.2: Radial polarised capacitor, 0.1 inch (2.5mm) pitch lead spacing, 0.2 inch (5mm) diameter
DIODE0.3: Axial diode, 0.3 inch (7.5mm) pitch lead spacing
DIP20: IC, standard 0.3 inch pitch 20 pin DIP package
DIP18: IC, standard 0.3 inch pitch 18 pin DIP package
TP: Test point or terminal
PCLAMINATE: The part being specified here is the etched PCB laminate
AXIAL0.4: 0.4 inch pitch unpolarised component (e.g. resistor)
TV-06A: Push button switch, zippy brand
S2020SMT: Slide switch
TO-92A: Standard TO-92 package, with staggered leads, 0.1 inch pitch spacing
VR4: Adjustable pot, staggered leads, 0.1 inch pitch spacing
XTAL2: Crystal, HC49/4H (also called HC49Small) package

Parts Notes

2.2UF50VMM: Radial polarised capacitor, Microminiature style, e.g. Rubycon, elna
AT89C2051: Atmel microprocessor, see Atmel site for data and a programmer
ULN2803A: Manufacturer: Allegro (formerly known as Sprague)
27E: Resistor, value 27 ohm - substitute if required for different outputs
MEL12: Phototransistor - many substitutes will work, but darlington types offer the best sensitivity. We have used BP103B (Farnell 212-763 in Australia). Flat goes toward TR2 for two leaded devices.
3.57945MHz: Frequency depends on application program. Use a crystal, rather than a ceramic resonator (otherwise fit extra capacitors to gnd on X1 and X2).

HSETI Programming

HSETI assembler test program (hseti.ASM)

tasm32.zip (or original from telemark) -

Assembler tools to compile hseti.asm

The program needed for the HSETI PCB will depend on what you want to do with the board. We have written a small skeleton program in 8051 assembler, the link for this is provided above. Also the assembler is available for download, the assembler is shareware, continued use will require registration.

The program HSETI.ASM, above, contains equates for the I/O and exercises all the port bits. Running it should allow you to quickly test your new HSETI board.

Download a .PDF version of the AT89C2051 data sheet
For more information on these microprocessors, visit Atmel's site.

Using the HSETI PCB

The diagram above shows a typical circuit using the HSETI PCB, with the optional serial port in place also. The serial port does not have strict RS232 level signals, but will work with just about all PC clones with reasonable cable lengths. The "component" X1 is just a link. To get better RS232 levels, cut X1 and insert a negative 3-4.5v power supply. This will give a +3/-3v RS232 Tx signal, which is better at driving longer cables than the +3v/0v signal obtained with X1 as a link.

As noted previously, while this diagram shows 3v/4.5v battery, for best results, use 4.5-5v, or omit ULN2803A.

This design is provided available for whoever wants it. There is no guarantee attached to it, naturally, although you can be assured that we have built the board as described, and run the test program on it. The original use for the board was for a kids group project here in NSW, Australia - making a "UFO" with flashing lights!