Re: ElektronikJack aktueller DIY Sim mit XSIM2 und Tacho
Hi Thanos !
I know it's not easy to find the right car tacho board.
i went to many auto graveyards and searching for a board up to 6000rpm and up to 220
Km/h. So i buy with luck a Audi A8 board with a destroyed information display. i get
it for 20euro. On this pcb are two coil driver KEZA300 from ITT. each control a smal
180deg and a big 270deg air coil meter. But i make the mistake and destroy the µP on
the pcb, so i can't measure and testing the function of this serial bus controlled
So i decide to separate the tachocontroller from the meter controller.
It's really simple ! : the PC send from the new SIM2 over the lcdhype gauche plugin
data over a second com like this s280r17200t70g39m2e
s=speed,r=rpms,t=temperatur;g=gasoline-tank and end marker
And the Tachocontroller send any changes like this
Print "r" ; Drehzahl ; "s" ; Geschwindigkeit ; "t" ; Temperatur ; "g" ; Tank ; "e"
but as a byte 0..255 = 0..100%
So if you only whant the meters ( not the lights, gear
LED,beeper,switches,ignition,engine starter...) you need only the meter controller.
I try many "meters":
-rc-servos : the are cheap 5euro, but slow, and you to change it from 180deg to
the controller is simple: 1..20ms = 0..100%, but go below 1ms kill the gearbox!
-normal mA meter is cheap from 5euro and simple over pwm to control. but the meter
angle is only 90deg
-i buy VW golf III tacho by ebay for 20Euro. the uses "steppermotors" (i see this in
a new smal BMW). the control chip hat for every meter-motor the direction and step
inputs. i make a controller for this too. but this tacho goes only up to 6000rpm and
200Km/h. i whant to finish this project for other people.
-the air-coil controller uses the ELEX14308 for every big 270deg meter and simple PWM
and a l298 for the small 90deg meter .
i try to fix all projects an then paste all at a gauche section.
if you whant to use the air-coil meters direct on you controller you need 4 pwm
outputs as frequency outputs and the cpu power.
lets talk about that