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EPROM adapter for ATMEL 89 Series Flash Microcontroller Programmer Ver 2.0

EPROM adapter for ATMEL 89 Series Flash Microcontroller Programmer Ver 2.0

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Devices

The EEprom programmer software supports the following devices.

28C16 28C256 28C17 29C256 28C64

Hardware

Diode D1 and resistor R1 provide the VDD isolation when programming the 24 pin devices. The jumper J3 must be shorted for 24 pin devices, and open circuit for 28 pin device programming. Following EEPROMs are pin compatible with their EPROMs version,

28C16 —> 2716

28C64 —> 2764

29C256 —> 27256

The software for this adapter is located here: http://chaokhun.kmitl.ac.th/~kswichit/E2RomPgm_web/PgmE2w.zip

Schematic

PCB

Parts Placement

Download above in pdf (198KB)

Kyriakos Kontakos (kkontak@hotmail.com)

Title: EPROM adapter for ATMEL 89 Series Flash Microcontroller Programmer Ver 2.0
Source: www.electronics-lab.com

September 28, 2008 Posted by IndianEngineer | project ideas | | 5 Comments

Servo Motor Control with PIC16F84

Servo Motor Control with PIC16F84

This simple micro-control circuit controls a servo motor according to a 3-state switch. A servo motor acts as an actuator in 3 position. It has 3 wires, one for VCC, one for Ground and another one for position control. The last signal is a single pulse with variable width. The pulse width can vary between 1 and 2 mSec. An 1 mSec pulse width turns the motor axis in -45 degrees position. An 1.5 mSec pulse width turns the motor axis in 0 degree position. A 2 mSec pulse width turns the motor axis in +45 degrees position. The following source code has been written in PICBasic:

Symbol porta = 5
b3 = 150
start:
Peek porta,b0
If bit0 = 0 Then sweepl
If bit1 = 0 Then sweepr
Pulsout 0,b3
Pause 18
Goto start
sweepl:
b3 = b3 + 1
Pulsout 0,b3
Pause 18
If b3 > 200 Then hold1
Goto start
sweepr:
b3 = b3 – 1
Pulsout 0,b3
Pause 18
If b3 < 100 Then hold2
Goto start
hold1:
b3 = 200
Goto start
hold2:
b3 = 100
Goto start

Title: Servo Motor Control with PIC16F84
Source: unknown

September 28, 2008 Posted by IndianEngineer | project ideas | | 9 Comments