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  1. J

    Basic Pulse generation help

    Not the screw itself, but behind the area i circled in pic below. I think its just behind the built-in LED. The LED gets very bright when it gets warm.
  2. J

    Basic Pulse generation help

    I tested range 2 again now. No difference. There are two screws to adjust. When I screw the top one clockwise the board starts getting a bit hot
  3. J

    Basic Pulse generation help

    There are 4 jumpers on the pulse generator, and the datasheet says: The output frequency is continuously adjustable using the onboard jumpers and potentiometers. Jumper settings are: 1Hz ~ 50Hz 50Hz ~ 1kHz 1KHz ~ 10kHz 10kHz ~ 200kHz The output duty cycle can fine-tuned...
  4. J

    Basic Pulse generation help

    I also tried putting a led without the resistor. Led blinks nicely and the rate of blink is adjustable with the potentiometer. I also tried directly from the collector leg to pin 20 but still no speed being detected. Any ideas?
  5. J

    Basic Pulse generation help

    So I tried this interface using the 2N2222 and the square pulse wave generator. The square wave generator has 4 jumpers low to high. I tried from the low to high and played around with adjusting the potentiometer clockwise and anti-clockwise but the cluster just wasnt responding with any speed...
  6. J

    Basic Pulse generation help

    So I received the 2N2222 and will try it out later today. The drawing supplied by the supplier is below. So based on this. am I correct in understanding that the middle pin is base. With the transistor with the flat side facing me the left pin is emitter and the right is collector. So with the...
  7. J

    Basic Pulse generation help

    The base on the 2N2222's are always the middle pin right? Then how do you tell which is collector and which is emitter?
  8. J

    Basic Pulse generation help

    Hopefully i'll get delivery of the 2N2222's tomorrow so I can test it out. I dont think I have any red LED's laying around and none without built-in resistors. I could potentially remove a red LED from some old things that may be laying around. I'm powering it from a cig light socket using the...
  9. J

    Basic Pulse generation help

    I've ordered some 2N2222 transistors, hopefully it will arrive tomorrow for me to test out
  10. J

    Basic Pulse generation help

    Silly me, i didn't read your reply properly. I think now that i've read through it properly it makes a lot of sense. So from pin 20 to my LED red wire (with inline resistor). From LED black wire to the collector of the 2N2222. The emitter of the transistor to the common ground (body of the...
  11. J

    Basic Pulse generation help

    A DMM. One of those yellow ones.
  12. J

    Basic Pulse generation help

    I got around 10V on pin 20. It's not the same as supply voltage as supply is 12V to 13V. When I measure voltage on pin 19 which is supposed to be speed signal output, I get a much lower voltage reading I cant remember exactly how much i think it was something like 3 or 4 volts. If i connect a...
  13. J

    Basic Pulse generation help

    Only the picture I posted in the first post and the following information:
  14. J

    Basic Pulse generation help

    Oh I see, does that mean in the diagram that @majoco drew, the output from pin 20 is going to a resistor then a LED? But my LED is pre-wired with a resistor already to accept 12v. So I would just connect it inline to the pin 20 output where i drew a box with ????
  15. J

    Basic Pulse generation help

    Thank you @majoco I've tried to understand your diagram by re-drawing it to match what I know. Below is a pic of my drawing. But only thing I am a little confused about is the section where I put ????? Do I just put my LED inline on that wire? So, the positive of the LED wire on pin 20 and...
  16. J

    Basic Pulse generation help

    I'm using one of those yellow digital multimeters. it's reading about 10volts. I have a small LED prewired with a resistor and if connect it to that pin 20 and ground body of the cluster the LED lights up. So means power is coming out. So if power is coming out, how do I send pulses to it to get...
  17. J

    Basic Pulse generation help

    So I received the NE555 adjustable module from here: https://www.ebay.co.uk/itm/262841412289 Pin 19 and 20 on the cluster are related to speed signal. Pin 19 is speed output and Pin 20 is speed input. It seems like the output provides speed information to other ECU's that need the speed...
  18. J

    Basic Pulse generation help

    Thank you. I'm waiting for this NE555 Adjustable Module to arrive, once it arrives i'll do some experimenting with it and report back.
  19. J

    Basic Pulse generation help

    Thanks, I have ordered the following NE555 Adjustable Module Duty Cycle Pulse Frequency Square Wave Signal Generator. I will see if I can get anywhere with that once it arrives. Any ideas if this will work? As there is only a single pin on the connector dedicated to the speed signal input, how...
  20. J

    Basic Pulse generation help

    What kind of PCB ready made kit can I look for that will work? The diagram says One wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows. So, if I wanted to simulate speeds like 100mph then what kind of pulses would I need?
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