PWM Output (analog)  

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(@brooin8)
Member

I had was wondering if the unit puts out the PWM signal while bench testing. I use an analog signal for my dyno and I am noticing the output stays at 4.57v always. Even if I "test" the output with the mouse by moving the bar. My guess is that it doesn't test unless it sees an rpm signal. Otherwise I don't know why the software is not varying the voltage on the "0v, out, 5v" connector. Thanks, Andrew

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Posted : 24/04/2019 3:49 am
(@admin)
Member Admin

Hi, 

You need to move the jumper inside the box if you use analog output.

Rpm has no impact in test mode. 

 

 

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Posted : 24/04/2019 6:20 am
(@brooin8)
Member

Okay tank you.  

Would it be on the other side of the pcb? I don’t see a jumper by the pwm output.  I have the rev 2 ab green board.  

This post was modified 5 months ago by brooin8
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Posted : 24/04/2019 8:23 am
(@bmgjet)
Dyno Wizard Moderator

You need to open the lid of the box and the jumpers are inside it as can be seen on the wiki.
https://yourdyno.com/YourDynoHelp/brake-control-basics/

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Posted : 25/04/2019 2:11 am
(@brooin8)
Member

I bought mine in 2017 so I believe my terminals don't exist. So I believe the signal is never getting to the output pin. It must just be the pullup that I am seeing. 

I tested where the missing connection was and found the signal. 

I had the software at %30 and it gave a reading that was believable, 1.4 volts. 

I am not sure if the center pin in the photos will be sufficient as a signal alone. It looks like it had a transistor there at Q1 on my board. I am feeding the signal to an Arduino so it shouldn't need that much current for the analog signal input to the Arduino. I am going to try and just feed the signal from the processor straight to the Arduino brake controller. 

Here are some photos that I will update as I get things working. 

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Posted : 25/04/2019 5:49 am
(@brooin8)
Member

Here is the Voltage reading from the %30 test with a volt meter. I want to put it on my scope to see the signal but I don't think it is necessary. If someone wants to see the signal, I can post it.

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Posted : 25/04/2019 5:51 am
(@brooin8)
Member

I have an update with the dyno pwm output.

Here is a video showing the connections for the pwm output. PWMout

Here is a video showing the function of the output with the dyno percentage. DynoPwm

I am going to do test runs with my Tesla and see how things are working.

Update video soon.

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Posted : 04/05/2019 7:11 pm
(@mach_1)
Member

Hi Brooin8, watched your two utube clips you posted.

What are you trying to accomplish running the ardunio platform simultaneous with YourDyno box ?

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Posted : 05/05/2019 3:34 am
(@brooin8)
Member

The brake is controlled by the SCR transistors. The part of the board that controls the SCR's was cut out of the original brake controller. It was 90's software and technology so I had no way to interface to the board and control the brake. So I cut the part of the board out that had the SCR circuit leaving the opto isolater open to be controlled by a micro controller. The Arduino finds the zero crossing point of the AC wave going into the brake and chooses when to turn on the brake and at what point. This is done with an analog voltage fed into the Arduino which corresponds to a point on the AC wave for different power output to the brake through the SCR.

This is where I got the idea to control this old Clayton dyno. I didn't want to buy a brake controller, so I took apart the original board and used what I could to make it work, and it finally does.  ZeroCrossingVideo

Dyno pulls coming soon.

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Posted : 05/05/2019 6:40 am
(@bmgjet)
Dyno Wizard Moderator

Like the Chev project.
Iv done a few using using speeduino if your looking for a cheap ECU that runs on arduino mega. Code is open source as well.
Can use a TBI carby from early 90s, and control the HEI ignition timing all though it. or get a tuned port manifold and run group fire injection.

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Posted : 05/05/2019 6:52 am
(@mach_1)
Member

Ok nice.

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Posted : 05/05/2019 6:56 am
(@mach_1)
Member

Care to share the arduino sketch for the scr zero cross over referencing ?

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Posted : 05/05/2019 7:33 am
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