Mixer from a printer (Watch Winder Multi Deluxe)

WW2_profile.jpg

WatchWinderMD.c (13997Bytes)
WatchWinderMD_Schemes.pdf (74666Bytes)

A few months ago, I made a simple watch-winder for automatic wrist watches of my neighbor’s collection. The automatic wrist watches don’t need a battery as they are being wound up mechanically by hand movement on everyday normal use. Because my neighbor doesn’t have enough hands to wear all his collection at once, he needed a machine to wind them up from time to time. I was afraid that the first simple model of the watch winder would not survive long and so I started to work on a new improved version, which could wind up several wrist watches with a selection of rotation speed, direction and time using a control unit with LCD and buttons.

For mechanical parts I used an old salvaged printer HP DeskJet PhotoSmart 1215 taking its steel frame and geared DC motor with rollers for paper feed. Its printing head was used as a restainer. Originally I wanted to use its integrated encoder with 1800 tics per rotation but it showed up that the maximum speed its original encoder circuit can handle is about 2 rps only.  So I had to make a new rotation counter from a photointerrupter used somewhere else in this printer and to glue a piece of plastic to a shaft of the roller.

The control unit is positioned at the back side of the printer frame and it is powered by a 24 VDC/500 mA printer adapter. The user interface is formed by an alphanumeric LCD display and five direction buttons. In the first step, the user enters the number of rotation steps. Then the user sets rotation time, direction and speed in each step. After confirming the start, the program measures the time of each rotation and regulates its PWM output to the motor to keep the rotations at the required value. The program also measures motor current and turns off the output when a value over 500 mA is detected. The motor is also stopped if the rotation drops below 0.5 rps. The effective rotation range is 1.0 – 10.0 rps.

The wrist watches are inserted into a plastic tube from a small hobby drill and separated by foam spacers. The mixer can have other uses as well, for example mixing of paint spray cans, food cans or even drinks J.

 

WW2_topview.jpg

Front view:

WW2_Frontview.jpg

Back view:

WW2_Backview.jpg

Motor with gears:


Plastic tube with wrist watches and foam spacers:

WW2_watches.jpg

WW2_Watches2.jpg

 


 

The control unit parts

-          MCU: PIC18F26K22

       Inputs:

  •  5 buttons for LCD control
  •  Photointerrupter for rotation counting
  •  Motor current measurement via L293E

-          Outputs:

  •   Bidirectional motor driver L293E for a printer roller motor
  •   LCD alphanumeric display 16x2

-          Power: 24 VDC/500 mA printer adapter, 5 VDC via 7805 linear stabilizer for MCU and the rest.

PCB: universal line PCB (e=0.1´´)

 

 

WW2_ControlUnit.jpg

Program windows:

 


 

Table of components:

Code

Type

Parameters

Function

C1

capacitor

ceramic 100 nF

driver power filter

C2

capacitor

ceramic 100 nF

driver power filter 

C3

capacitor

electrolytic 630 µF

power filter and buffer

C4

capacitor

SMD 0805 ceramic 10 µF

7805 output capacitor

C5

capacitor

SMD 0805 ceramic 100 nF

7805 input capacitor

C6

capacitor

SMD 0805 ceramic 100 nF

7805 output capacitor

C7

capacitor

ceramic 100 nF

MCU power filter

D1

diode

UF4007

power polarity protection

D2-D5

diode

UF4007

driver output protection

DS1

LCD display 16x2

RC1602B2-GHW-CSX

setting and displaying program parameters

FU1

polymer fuse

500 mA

overcurrent and polarity protection

IC1

stabilizer

7805

5V power source

IC2

MCU

PIC18F26K22

main microcontroller

IC3

motor driver

L293E

bidirectional motor driver

JP1

pin header

 

ISCP programming

JP2

pin header

 

UART communication (not used)

K1

terminal

ARK500/3

main power connector

K2

terminal

ARK500/2

motor connector

K3

terminal

ARK500/3

rotation counter connector

K4

terminal

IDC10

connector to the setting buttons

M1

motor

HP DJ PhotoSmart 1215 paper feed motor with gears

main motor

PI1

photointerrupter 

from a HP printer

rotation counter

R1

resistor

2.2  Ω

current shunt resistor

R2

resistor

180 Ω

photointerrupter input resistor 

R3

resistor

1 kΩ

motor driver input protection

R4

resistor

1 kΩ

motor driver input protection 

R5

resistor

1 kΩ

motor driver input protection

R6

trimmer

5 kΩ

LCD display contrast setting

R7

resistor

1 kΩ

LCD display contrast setting 

R8

resistor

68 Ω

LCD display background light

R9

resistor

1 kΩ

MCU analog input protection

R10

resistor

2.2 kΩ

photointerrupter output resistor 

S1

switch

toggle switch

main power switch

 

 

 

 


 


 

Functional scheme:

 


 

Soldering scheme (universal line PCB; e=0.1´´):

WW2_Soldering.jpg

 


 

 

Control unit interior:

 

PCB connections:

WW2_PCBconn.jpg

 

Control unit right side:

 

Rotation counter with photointerrupter:


https://www.youtube.com/watch?v=NX4sSGZLhY8

HiNice build with

Hi

Nice build with interesting uses :slight_smile:

Hi…

Appreciate your work…