Megasquirt Support Forum (MSEXTRA)

Ok, that's what I figured, but thought I would double check. Not a road block.

Jean,
Can TinyIOx decode and record a PWM signal? Such as an RC servo PWM signal? 50 hz, 4% to 11% duty cycle range, min to max.

Well, to finish this post for others to find, and for me to find in 5 years from now... The .ini formula to convert TinyIOx pwm1 "counts" to a real rpm number is: shaftrpm = clock * 60/(pwm1*teeth*prescaler) Where: pwm1 = the value from tinyiox, and is = to the counts clock = TMR1 source (...

New SW is loaded. Using Port Scanner makes that really easy. Good job, Jean! TinyIOx is now communicating to TS in stand alone mode. My Tiny has a CAN id=5. It finally dawned on me that there is a setting for that, in TS, and once I changed that, then it communicated in Stand alone mode. So cool! :y...

I forgot to mention that you can perform the RX-TX swap on the board itself using the solder jumpers on each side of the 2.5mm jack. You would need to remove the solder that currently makes the connection and then solder wires from one side to the other. The pad away from the jack is connected to t...

Hi Jean, I am trying to communicate to a TinyIOx directly with TunerStudio. It has been a few years since I messed with the Tiny. I was able to communicate to it via connecting it to a microsquirt via CAN, but not directly to TunerStudio via Com1 port. The Tiny is running V0.1.0D. I have verified th...

Good trick using the A/C input. I asked for the same thing several years go (talking to DIYAuto tune) but guess they didn't get relayed to James to make the change. I have A/C on my street car, so can't use this trick. A dedicated adder when in gear is needed. Or add a feed forward path on the close...

I had this same issue back in 2015. http://www.msextra.com/forums/viewtopic.php?f=131&t=60895 I ended up contacting the owner of EFI Connections, explained the situation. He worked with me and allowed me to return the 24x wheel in exchange for a 58x wheel. In fact, he sent me two wheels, one mir...

Matt,

Just notice you replied to the post. Attached is the tune I'm using in the TCU.

Dave

To future Dave...

The complete list of offsets are found in the TCU.ini, towards the end. Search on "[OutputChannels]". Example, slip_conv = offset 53. Table 7.

TCU Hardware: GPIO Firmware tried: trans-pre1.1beta2 (TCU), trans-release-1.0.1, same results Transmission: 4L60E TCU.GIF Frequency at the PC output is 94 Khz. Yes, 94,000 hz. No where near the 290hz that is in the ghosted config window. IMG_1025 (Medium).JPG Above photo is with 1K ohm resistor used...

Update: Cruise works smoothly now, after hardware mod. This weekend I built a dedicated VSS to Cruise Control converter. Used a Microchip PIC12F508 8-pin micro programmed to simply divide the tail shaft VSS signal by 24 and sending that signal directly to, and only to, the GM Cruise control unit. I ...

Had a thought this morning. I’ve seen this used in stepper motor controls before, where more modulation is required than want the stepper can give. Basically you dither between two steps, varying the duty cycle as required. The same technique could be applied to the freq out signal for the TCU speed...

smandzak, Are you using the "Discrete Switched12V IN" as the A/C request? I am on my setup, and found out that there is an inversion with the weak pull-down. When it is set to ON its really OFF, etc. I didn't find the thread on it until I already trouble shot the issue, and soldered a pull...

James, I'll hold off on the hardware hack until I hear from you. Thanks. For those wondering what MegaShift does, I loaded ver 5101 (what I have in the race car, using msGPIO) on the microsquirt V3 TCU. With a steady sine wave feeding into VR1, the SPEEDO output actually bounces around a little bit....

Jamies, yes, I suppose one could use an aftermarket Cruise unit. Additional benefits would be the ability to tune its behavior electronically (turn some pots, I presume). But I really want to keep the OEM unit. It is a robust unit. But your idea got me thinking. Maybe I can find the conditioned 0-5V...

Update. The smaller 48mm (stock) was slightly better than the 58mm, but the hunt was still there. Getting the SPEEDO signal from MS3Pro was better, TCU had worse hunting, surging. To make cruise control usable, I suspect we need 0.1 mph or better resolution on the freq out signal, preferably from th...

I had something very strange occur tonight, while idling the car in the driveway, letting it warm-up before a test drive. This vehicle is my highest integrated MS3Pro project to date. Using almost all the "street car comfort features" that are offered by the Megasquirt system, such as the ...

James, As an experiment tonight, I tried using a spare output on the MS3Pro to drive the Speedo. So the TCU reads the 40 tooth tone wheel on the transmission tail shaft, sends that value to MS3Pro via CAN, and then the MS3Pro sends out a 4000 pulse/mile square wave to the car's speedo and cruise con...

James, thansk for looking into this. So to summarize… With today’s TCU code, the speedo output signal (a square wave whose frequency is proportional to vehicle speed and drives the instrument cluster and cruise control in my application) we have a granularity limit of 256us, which at 70 mph, equates...