Article

PICee Development System

a PIC16F84-based single-board computer

This single-board computer, using the popular low-cost PIC16F84 microcontroller, has been developed with educational applications in mind.The PICee single-board computer described in this article is a versatile training and development system based on the well-known Microchip PIC16F84 microcontroller. The microcontroller’s flash memory is electrically erasable: hence the ‘ee’ in the title. In contrast to the 89C8252 Flash microcontroller board described in our December 2001 issue, the 16F84 processor used here is a so-called ‘RISC’ (reduced instruction set computer) microcontroller with only a small number of instructions. The PICee board allows experimentation with all 35 of the processor’s instructions without additional hardware. The board encompasses a wide range of applications, from a simple LED flasher to an elegant crystal-controlled clock.

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Materials

010062-PCB.pdf

010062-11.zip

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

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PCB

Download Gerber file: 010062-1.zip

Component list

Resistors:
R1,R15-R22,R25-R29 = 1kOhm 5
R2,R24,R34,R35 = 4kOhm 7
R3,R4,R6...R8,R10 = 10kOhm
R5,R12 = 1kOhm
R9,R11 = 470Ohm
R13 = 12kOhm
R14 = 10Ohm
R23 = 33 Ohm
R30 = 470kOhm
R31,R32 = 270Ohm
R33 = 3kOhm 3
P1 = 100kOhm preset
P2 = 10kOhm preset
Capacitors:
C1,C2,C3,C5,C6,C7,C10,C11,C12 = 100nF
C4 = 220pF
C8,C9 = 27pF
C13 = 470µ F 25V radial
C14,C15,C16 = 47µ F 16V radial
Semiconductors:
D1 = 1N4007
D2-D7 = 1N4148
D8-D11,D16-D19 = LED, 3mm, yellow, low current
D12-D18,D20,D21 = LED 3 mm, red, low current
D22 = LED, 3 mm, green, low current
T1,T2,T3 = BC547
IC1 = 7805
IC2 = TL497AC
IC3 = PIC16F84
IC4 = 74HCT125
Miscellaneous:
K1 = mains adaptor socket, PCB mount
K2 = 9-way sub-D socket (female), angled pins, PCB mount
K3 = DIN41612 connector, model B (Conrad Electronics # 741582)
K4 = 16-way SIL connector*
L1 = 100µ H
S1,S2,S4,S8,S9,S10 = toggle switch, 1 c/o contact, or 3-way pinheader with jumper
S3,S5,S6,S7 = pushbutton, e.g., ITT/Schadow type D6
X1 = quartz crystal socket with crystal*
Heatsink for IC1, e.g. type ICK35 (Fischer) (Dau Components)
PCB, order code 010062-1
Disk, contains example programs, order code 010062-11 or free download