Thanks for your replyIt's really weird, It should work with a little effort, here a check list :
- Does the needle moves even a little ?
- Cylinders : did you configure on the tach the numbers of cylinders ? It's critical
- Which arduino model do you use ?
- Could you try with another arduino, if you swapped the transistor and diode,it's not impossible that you fried the arduino by applying 12v to the pin. Try maybe another pin if you don't have another arduino.
- Power supply : what 12v power supply do you use ? At least a proper 500mA is required .
- Gnd : did you forgot to connect gnd to power supply and arduino gnd (no gnd no signal )
- Defective tach ... sh*t happens ..
The needle never moved the slightest, this is the second board ive tried using, the first was a 2560 mega and the current is a UNO. Can confirm that i have the ground connected from the 12v 1000ma trans to the arduino ground. As for the amount of cylinders i've tried 1 2 3 and 4 with no success , i have 9 RGB leds connected and they have worked fine even tried without them connected. I'm down to the point where i could be looking at getting a third arduino but then again its probably just the shitty $15 ebay tacho from china haha.
Other than that what would be the usual amount of cylinders , i see default is 4 is this the most common in most tacho's?
Thanks for all your help m8 , i know this should be an easy task , just has'nt worked out that way for me lol. Would there be a type of tachometer that you would recommend? something around the $40/$50 mark would suit my budget