M Asim Khan email@example.com
This single sided proto board provides an economical solution for developing and testing the projects around Atmel 20 pin series u-controllers (89Cx051 & AVR)
Figure 1 shows the circuit diagram of proto board. All port connections are available for user interface around the proto area including the power supply pins. MAX232 serial driver is used to provide a 3 wire RS232 interface for connecting to the PC or other rs232 devices. Switch S1 provide a manual reset to u-controller.
The crystal X1, C7 & C8 can be replaced by a three pin ceramic resonator, the pcb has provision for both type of oscillator interface.
For AVR devices the C6 and R2 has to be interchanged, because AVR series have active low reset input also the
Vcc point of reset switch S1 has to be connected to GND instead of Vcc, there is a provision on pcb for the selection of reset type for switch S1.
For printing the pcb files on HP laser printer download the PCBs.zipfile and run the Laser.bat file after extracting from the zip file.
Figure 2 & 3 shows the component layout of the proto board pcb and the track patterns respectively.
Figure 2: Component layout of the Proto PCB
Figure 3: Track patterns of the Proto PCB
Part List of the Project.
BRIDGE 100V 1A (DIP TYPE)
2 2 C1,C9 100nF CERAMIC
3 6 C2,C3,C4,C5,C6,C11 10uF 16V
4 2 C7,C8 33pF CERAMIC
5 1 C10 470uF 25V
6 1 D1 LED GREEN 3mm
7 1 K1 SIP CON 3 WAY
8 1 K2 DC SOCKET (PCB TYPE)
9 1 R1 100R
10 1 R2 10K
11 1 R3 560R
12 1 S1 PUSH SWITCH
13 1 U1 MAX232
14 1 U2 AT89Cx051, AT90S1200, AT90S2313
15 1 U3 LM7805
16 1 X1 CRYSTAL or CERAMIC RESONATOR
30 Jul 2002