PIC16x84
Toolkit - EPE's original design for PIC16C84 and PIC16F84 microcontrollers.
Stand-alone or interface to the PIC Tutor board, the PIC Toolkit was designed
for speed and versatility. At last, TASM and MPASM compatibility! The
EPE PIC Toolkit is a programmer, program disassembler and bi-lingual translator
all in one - a great idea for PIC users everywhere! Translate between
TASM and MPASM using easy DOS-based options. You need a PC-compatible
computer with QBasic or QuickBASIC installed, and a parallel port. A 12-14V
d.c. power supply is also required, which can be derived from an expansion
socket or separately.
The original
PIC Toolkit is now obsolete and you should use the TK3 (Toolkit Mk3) -
October 2001 issue.
In the September
98 issue (P. 685) we advised that on Page 527, Fig 1 l.e.d. D1 is shown
the wrong way round. The cathode (k) should go to the +5V line. The p.c.b.
layout is correct. In Fig. 3 and Fig 4, the annotations for resistors R10
and R11 have been transposed. R10 is the one that joins resistor R9. Both
resistors have the same value (100k). Also, in Fig. 3 and 4, resistor R6
is shown as R3 connected to the base (b) of transistor TR3. R3 is the one
that goes to pin 1 of IC3. In the January 1999 issue (P. 34) we commented
that QuickBASIC/ QBASIC memory capacity can be exceeded in some situations
of the conversion/ disassembly routines. The program has been slightly rewritten
to overcome these problems, and the source code files (diskette/ FTP site)
updated. Also, all references to the Busy line should read as Acknowledge
line. In Fig. 5 the connection marked Busy should go to the printer port
connector pin 10, not 11 as shown. The software, p.c.b. and standard printed
cable connections are correct.
Greenhouse
Computer (Part 1)
- microcontroller design uses Atmel's AT89C2051. Monitors and controls
heating and watering for your glasshouse. Part 2 includes a radio link,
which uses DTI-approved 418MHz radio modules.
In the January
1999 issue (P. 34), we said that under certain circumstances a small d.c.
voltage can occur across the probes which may affect the readings. To
avoid the problem, amend the Controller p.c.b. as follows: change C14
to 10nF, C13 to 470nF (0µ47), add a 100k resistor in parallel with
the probes across TB3. Add a 470nF (0µ47) capacitor in series with
TB3 pin 2 and its probe. The software (diskette/ FTP site) has been updated
to reduce the default watering time.
Using the L200CV voltage regulator - Andy Flind outlines basic principles of this versatile device.
Noise
Cancelling UnitRobert Penfold's novel anti-phasing design will, with a reasonably high quality set of headphones and microphones, provide a reasonable degree of attenuation over the low-mid audio spectrum. Stripboard design.
Low Battery
Indicator
- high performance, micropower circuit won't load your projects unduly.
Compact design fits most d.c. projects. Easy stripboard project