Good morning community!
My name is Emmanuel, I'm an electronics engineer
I recently started working in a company and I am in the area of electronic maintenance and repair, the problem lies in the instrumentaries that want to try are somewhat old, (at the end I attach photos of the tachographs and boards) I put the task of somehow create the instrument to test these, but I find myself stuck because I have more questions than answers,
What do i want to do, assemble a tester to check the operation of these instruments, for example, verify that the speed needle marks all marked km, for example, I want the speedometer to reach 80km and thats stops there, then if i want to reach up to 100km then stops there.
That the needles of the clock works, I do not know if anyone knows how the tachograph works, but this type of tachograph has a paper disk, which takes data, such as time, speeds, periods of inactivity, among others.
As this maintenance project is new to the company, I still lack a lot of information regarding this type of components.
until now I could find a tachograph with a decent print, where I could leave some information:
1 is powered with 24v DC
2 the tab A feeds what would be light, clock, and energizes the speedometer needles
3 the tab B also has a positive and negative entry, also has two lines that (may be wrong or not) are the signals that takes the vehicle to mark the speeds.
Until now I was able to energize the tachograph and verify a few things, if the lights turn on or not, feed the speedometer directly to see if it moves, but my conclusion is that I must modulate the signal that the tachograph receives to be able to move the velocity meter as is desired
I'm putting together a circuit with arduino to see if I can emulate the Bus, Collective, Trucks, which use this type of instrumentation
with this simple code I vary the speed of an engine, what i want is to apply it or modify it to be able to vary the different speedometer and to be marked in time.
int motor1=11;
int pot1=A0;
int val=0;
void setup() {
// put your setup code here, to run once:
pinMode(motor1,OUTPUT);
pinMode(pot1,INPUT);
}
void loop() {
// put your main code here, to run repeatedly:
val=analogRead(pot1);
analogWrite(motor1,val);
}
If you know a form or some contribution to be very grateful.
I will be publishing, any tool that manages to apply to these instruments that are obsolete, but that are still in operation in a lot of vehicles.
I have attached the base model made in proteus and the list of components that I have
arduino one r3
1n4003 diode
mosfet 2n7000
motor
potentiometer
100k resistance
