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[bigtalltim]

CONTENTS OF THIS THREAD:
As the thread has grown in size it has become increasingly difficult to find content quickly...
Here are the locations of some of the key points, demos and design considerations:

Page1/Post1: CIRCUIT - 12V Relay circuit design
Page1/Post1: VIDEO-DEMO - Explanation on relay setup
Page1/Post1: VIDEO-DEMO - Demo of multiple wiper motors
Page1/Post1: PROFILE - Basic build of relay setup (No position feedback)
Page1/Post8: CIRCUIT - Frakks MOSFET version of Relay Circuit
Page2/Post8: CIRCUIT - Track layout for 12V Dual Relay circuit
Page2/Post8: EXPLANATION - Description of Relay circuit build
Page2/Post9: VIDEO-DEMO - How to set up K8055 for Position Feedback
Page2/Post9: CIRCUIT - Wiring diagram for connection of Pots to K8055
Page3/Post1: VIDEO-DEMO - Frame - Initial Proof of Concept Test
Page3/Post5: CIRCUIT - How to connect K8055 to Pololu High Power Motor Driver 24V20
Page6/Post2: VIDEO - First test of Sarrus Linkage Actuator
Page6/Post2: VIDEO-DEMO - Comparison of RolandVanRoys solution and my own including design concepts
Page7/Post2: VIDEO - Second test of Sarrus linkage demonstrating good positioning response
Page7/Post9: EXPLANATION - How to use Test Tablet
Page11/Post1: EXPLANATION - How to connect multiple K8055s to a single PC
Page11/Post5: EXPLANATION - PID Control concepts and link to further reading (wikipedia)
Page12/Post9: CIRCUIT - 24V version of Relay circuit (see also Page13/Post3)
Page14/Post4: CIRCUIT - ADBGGs circuit layout for K8055 and Sabretooth 2x10A
Page14/Post9: EXPLANATION - HOW THE K8055 and RELAY SOLUTION WORKS!
Page14/Post9: CIRCUIT - Track layout for 24V dual relay circuit
Page15/Post7: VIDEO - Further tests of Sarrus linkage type actuator
Page17/Post1: EXPLANATION - Screw thread actuator concept - fail
Page17/Post5: EXPLANATION - First steps towards Chain Drive setup
Page17/Post6: VIDEO - Chain Driven Linear Actuator - Proof of concept test
Page17/Post9: VIDEO-DEMO - How to wire a switch to change motor direction
Page17/Post9: VIDEO - Extreme Stress test - Demonstration of power available through gear reduction
Page18/Post5: EXPLANATION - Tronics solution - How to wire Automatic Direction Recovery Diodes
Page18/Post7: VIDEO-DEMO - How Auto Direction Recovery Diodes work
Page18/Post10: VIDEO-DEMO - Switches at Extremes of position with Direction Recovery Diodes
Page22/Post2: EXPLANATION - How to connect up to 3 motors with bi directional control or up to 6 extra motors to one K8055
Page22/Post2: CIRCUIT - H bridge to use spare digital outputs and enable a 3rd bi-directional motor with one K8055


For all those who have asked about the Velleman K8055 and it's use for wiper motor control...

Here's how I have done it

This setup allows variable speed through the use of Pulse Width Modulation (PWM) and bi directional motor control of two windscreen wiper motors. Other solutions I have seen (including the basic preloaded profile in X-sim for the K8055) do not use PWM, and have to have complicated pulsing routines built in to slow and change direction...
This is way simpler than all that!

Also, this uses relays so there is practically no power loss to heat unlike MOSFET H-bridge alternatives.

Better than any other single benefit, this setup is cheap - super cheap!

The complete double wiper setup shown in the video has cost me no more than £75...
I costed the components for Tronics AMC alone at about £73 locally to me, and then you have to buy the hbridge bits... and then the motors...
Way too much for me to spend right now! - besides... I already had a K8055

Below is a list of my spend so far:
Velleman K8055 prebuilt £30
Wiper motor from ebay - £14 no postage
wiper motor from ebay - £12 + £6 postage
DPDT relay £4.99 each (x2)
Relay Socket £1.69 each (x2)
1K resistors £0.14 each (x2)
4 diodes (from a lucky bag... about £0.10 each)
2 NPN Transistors (from a lucky bag... about £0.15 each)
PCB sheet £1.54


I already had some bits lying around (so there was no cost unique to this project):
Power supply from an old dead PC
Etching fluid
Solder
USB Lead for K8055
Old wires to connect it all together
PC Fan to cool - not required for test, but may be needed for the transistors under full load
Connectors to hard wire into the board to connect to power supply
2 Junction blocks to make connecting the wiper motors easier

The circuit solution I found in the velleman forum:

all credit to paledin micro for the circuit design

From this circuit, I designed my own PCB to use cheap locally available relay parts.
The circuit is simple and takes little time to make - even for an inexperienced PCB maker like me!
To use other relays the design may need to change, but if anyone is interested, and I will draw it up and scan it in - I'm afraid the photos I have aren't great (as you can see here! )

Here is a video showing the two motors working independantly



Here is a video where I give a description of how it works


The profile is extremely simple - only two lines for each direction per axis:

BigTallTims version for Dual Relay setup.rn2

BigTallTims K8055 Relay Setup

(9.8 KiB) Downloaded 854 times

Enjoy!

Tim

[Frakk]

Thank you Tim for sharing!

Also, this uses relays so there is practically no power loss to heat unlike MOSFET H-bridge alternatives.

4 diodes (from a lucky bag... about £0.10 each)
2 NPN Transistors (from a lucky bag... about £0.15 each)

I would like to see how hot these "lucky bag" components get...

Let's put some thought into these components and it will be TOP WORK!

This can also be connected to the AMC to replace the dMSHB for those who are looking!


oh, and the best part is: It is so simple you can build it on a perfboard, even without copper on it.

[bigtalltim]

I would like to see how hot these "lucky bag" components get...

With no load on the wipers, with it running for approx 5 minutes on a slow speed, I could still touch them...

On the medium or fast speed, they are too hot to touch with no fan - the fan worked really well to cool them.
I'm afraid I am no expert on components - they are marked "TFK 9606 BUX 127 VDO"

Tim

[obisk]

is that better then thanos controller?

[Frakk]

obisk: yes and no...

[obisk]

why yes and why no?

[Frakk]

Because I'm not your electronics teacher...

Google is your friend!

Maybe Wikipedia?
http://en.wikipedia.org/wiki/Relay
http://en.wikipedia.org/wiki/Mosfet


And better in what? Price? Performance? Simplicity? Size?

[Frakk]

Here is a diagram if you want to try it with MOSFETS:

Make sure to use LOGIC LEVEL ones if the PWM voltage from the K8055 is ~5V.

Current rating should suit the motors, about 15A continuous should be good for those wipers. Don't forget heetsinks.

[bigtalltim]

Here is a diagram if you want to try it with MOSFETS:

Relay Bridge.jpg

Make sure to use LOGIC LEVEL ones if the PWM voltage from the K8055 is ~5V.

Current rating should suit the motors, about 15A continuous should be good for those wipers. Don't forget heetsinks.

Superb - Many thanks for this!

I will try to get these parts and build this as well!

When I get the components and have this built, I will post a video of this alternative side by side with my own version to compare the performance

Tim

[tronicgr]

Very nice speed controller!

But... position feedback potentiometer? where you connect that?