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Panzer T70 Resto-Mod


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#241 KennyP OFFLINE  

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Posted March 14, 2017 - 01:29 PM

Have a fix for that. Already have some wider wheels and 10" wide lug tires.


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I was thinking some 26-12's! LOL


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#242 BowDown OFFLINE  

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Posted March 14, 2017 - 01:31 PM

I was thinking some 26-12's! LOL


Lol. Was hoping to keep the fenders. Plus I'm hoping not to have to rebuild the shed too. Guess if it looks weird there's always a wheel swap option. :)


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#243 BowDown OFFLINE  

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Posted March 20, 2017 - 10:34 AM

Tach arrived and I tested my tach signal driver using serial pushed values from my computer. Works damn nice! Now to install the Hall effect sensor on the Magnum 20 to read the flywheel magnets and use that data to move the tach needle. :)



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#244 BowDown OFFLINE  

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Posted March 20, 2017 - 10:38 AM

https://youtu.be/6FwAJhXaNMQ

Video link for the tachometer testing.

b6de08ee32741dee17712c736c5aa953.jpg


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Edited by BowDown, March 20, 2017 - 11:50 AM.

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#245 tiretrx OFFLINE  

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Posted March 21, 2017 - 09:02 AM

If you could walk us through the process, I would be greatly interested. And if you do it in a way a cave man could understand.....I would be personally grateful :thumbs:


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#246 BowDown OFFLINE  

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Posted March 21, 2017 - 09:31 AM

If you could walk us through the process, I would be greatly interested. And if you do it in a way a cave man could understand.....I would be personally grateful :thumbs:

 

 

I'll give it a shot! LOL

 

 

Ok so I ordered a typical automotive tachometer from Amazon.com. This tach has been setup to see an 8-cylinder engine tach signal. The tach needs 12v+, Ground, Illumination 12v+, and a tach sense signal to work. The tach sense signal is the tricky piece that is lacking on small engines, or even modern day engines... This is where the arduino microprocessor comes in. 

 

In order to read some kind of RPM value from the motor we have many options... optical, magnetic, encoders.. blah blah. The most simple on my Magnum 20 motor is to read the same magnets embedded into the flywheel that the coil pack uses. 

 

So in order to do this I have purchased what is known as a magnetic reed switch, or otherwise known as a magnetic hall effect sensor. I found one that's already encased in a weather tight ABS enclosure with mounting tabs.. but you could acquire a raw sensor and make it weather tight. 

 

55100_series_DSL.jpg

 

Anyway, it needs to be within about 1cm of the flywheel so I'm going to mount it to the back side of the flywheel shroud after determining the correct amount of gap between the sensor and the flywheel. This sensor will give you 3 wires.. Red = +Voltage, Black = ground, Blue = return +voltage. 

 

I'm going to power this sensor from the microprocessor's 5v DC regulator, that way the 5v coming back is within the tolerance of the input pins. 

 

Following so far? Here's the fuzzy logic stuff...

 

So now that the sensor is hooked to the microprocessor's input I can write a program that will monitor the status of the sensor as it pics up the magnets flying by.. I compare the number of clicks against a 1 second interval of evaluation and figure out how fast the flywheel is turning. It's a bit of an unknown but I may have to divide this number in 1/2 as there are 2 magnets in my flywheel because it's a 2 cylinder engine.. Ok, so now we have a RPM value to use for the tachometer.. but the tach doesn't care about hall effect clicks... it wants to see a tone. Yes, a hum if you will... so I use the microprocessor to create this hum. There's a calculation to determine what Hz value needs to be passed based on tachometer cylinder selection, and rpm value collected. The calculation used to make this tach function during testing is:

 

rpmTone = rpm * (8 / 120) * 1.045

 

So the hz value is rpmTone, rpm is the actual rpm value collected from the hall effect sensor, then cylinder count / 120, then there's a correction factor to make the needle show near exact what I'm sending it.

 

So in the demo I'm simulating the hall effect sensor and just sending the tach values 500->4500 in 500rpm increments. 

 

 

Hope this helps. 


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#247 Mark 149 J. ONLINE  

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Posted March 21, 2017 - 09:39 AM

Thanks for that information!

Does the hall effect sensor come with the microproccesore or did you order that seperate?  If it's seperate could you tell us where you got it?  Do you have any pictures of the proccesore?



#248 BowDown OFFLINE  

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Posted March 21, 2017 - 09:45 AM

Thanks for that information!

Does the hall effect sensor come with the microproccesore or did you order that seperate?  If it's seperate could you tell us where you got it?  Do you have any pictures of the proccesore?

 

No the microprocessor is just a hobby board that you can acquire from any small electronics vendor.. I prbly got this one from sparkfun.com for $10. The microprocessor out of the box is just a small computer waiting for someone to program it, and control it's input/output pins correctly.

 

So for this simple project it still required a 2.2k resistor, NPN transistor, and a diode to make the #9 output pin into a tach sense capable output pin. Just connecting the microprocessor output pin direct to the tach sense wire isn't going to make it work. If anything it will burn the microprocessor up.

 

For the input pin #2 in my project that reads the hall effect sensor that was a bit simpler but still required that I connect the sensor to the VCC 5+ positive, and GND pins and also carry a 850ohm pull-up resistor between the voltage in, and out on the hall effect sensor so that the microprocessor sees enough deviation between clicks. 

 

This project if sold as a kit would be prbly a 5 out of 10 level... 

 

I'm not against selling this thing as a ready to go option... so all you would have to do is acquire a tach, wire it up to a 12v source and mount the sensor near the flywheel magnets...?


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#249 BowDown OFFLINE  

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Posted March 21, 2017 - 09:48 AM

This is the microprocessor board that's driving the show. I have to add the Hall effect screw down terminal block yet and enclose it for weather.

fa1c9205fe36d8f40bacbb9550b3a963.jpg


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#250 tiretrx OFFLINE  

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Posted March 21, 2017 - 10:27 AM

Ok, I'm feeling on the same page with the process, thanks for taking the time. It's sounding a bit like the spindle rpm readout process on my CNC's through the use of encoders. Pretty cool stuff applied to a small engine.



#251 Mark 149 J. ONLINE  

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Posted March 21, 2017 - 10:36 AM

This is the microprocessor board that's driving the show. I have to add the Hall effect screw down terminal block yet and enclose it for weather.

fa1c9205fe36d8f40bacbb9550b3a963.jpg


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Thanks for the pictures!  It's starting to make more sense to me. 



#252 BowDown OFFLINE  

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Posted March 24, 2017 - 11:18 AM

Tach driver is ready to install in the motor. See if there's any more bugs after install. 0d920e9ef3c4963d5fbcc02c4c02fd64.jpg


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#253 BowDown OFFLINE  

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Posted April 05, 2017 - 01:11 PM

Still fighting with the damn steering. I ordered a bevel gear set to hopefully out this to rest.

In the meantime I reworked the rest end frame mounting brackets to use the original fender mounts. The frame will mount in 3 spots so it should be plenty strong. I'm going to cut off the 3/8" plates shown after I tack the new angle brackets in place.

daba5633f5e3a9fa8863088cd3ea5a28.jpge537aebf63cc004beabc04ccdc776789.jpg


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#254 BowDown OFFLINE  

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Posted April 05, 2017 - 01:12 PM

be322d60eb6e2361ccfa85093b593aa9.jpg


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#255 tiretrx OFFLINE  

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Posted April 06, 2017 - 07:40 AM

That looks great. :thumbs:

 

Forgive me here, as I'm sure you covered it, but could you refresh me on your tire/wheel plan. Are these the finals or something else?






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