No rpm Speeduino for mx5 NB 1998

No rpm Speeduino for mx5 NB 1998#41880

By danielg - Mon Apr 06, 2020 5:29 pm

- Mon Apr 06, 2020 5:29 pm #41880

I have assembled my speeduino board. downloaded all the software and uploaded it to the speeduino. I've got an arduino uno with ardustim thats set to 36-1 at 750 rpm, speeduino has base map that trigger settings at 36-1. The speeduino rpm gauge doesn't show anything. The speeduion has lights LED 5 and LED 7 on permanently with no change. 12v source is plugged in and gnd taken to uno.

Yet i have no rpms on my gauge. im not sure if i have the jumpers set up properly i have JP4 on and JP2 to hall as i believe the crank sensor for mx5 is a hall sensor. any help appreciated please.

Re: No rpm Speeduino for mx5 NB 1998#41891

By LPG2CV - Mon Apr 06, 2020 9:17 pm

- Mon Apr 06, 2020 9:17 pm #41891

Have you selected the correct board?

Mere Mortal

Re: No rpm Speeduino for mx5 NB 1998#41913

By danielg - Tue Apr 07, 2020 4:16 pm

- Tue Apr 07, 2020 4:16 pm #41913

Yep. speeduino 0.4

Re: No rpm Speeduino for mx5 NB 1998#41914

By danielg - Tue Apr 07, 2020 4:31 pm

- Tue Apr 07, 2020 4:31 pm #41914

So i took a voltage reading on pin 25 crank pin and its at 4.96 volts is this right?

Re: No rpm Speeduino for mx5 NB 1998#41916

By LPG2CV - Tue Apr 07, 2020 4:49 pm

- Tue Apr 07, 2020 4:49 pm #41916

Remove jmp4 as you don't need it for ardustim, but will require it for the engine the sensor.

Mere Mortal

Re: No rpm Speeduino for mx5 NB 1998#41920

By danielg - Tue Apr 07, 2020 5:18 pm

- Tue Apr 07, 2020 5:18 pm #41920

Figured it out I used a schematic to figure out the route for the crank signal and turns out I had no continuity between D19 and the pin going into D19 so a bad solder joint was to blame!

Re: No rpm Speeduino for mx5 NB 1998#41921

By LPG2CV - Tue Apr 07, 2020 5:33 pm

- Tue Apr 07, 2020 5:33 pm #41921

Awesome. Well done

Mere Mortal