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JohnPattersonConsulting / DuneBuggyEFI

Files for my experiments with Electronic Fuel Injection on the dune buggy will be posted here.
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2 signal EFI circuit using MOSFET + 555 #4

Open soupflood opened 1 year ago

soupflood commented 1 year ago

I built an EFI circuit using your electronic schematic, only I used a MOSFET driven by a TL555 in the gate buffer mode. I would like to send you the schematic I used for you to post it along with your original one, so that other people can also use it if they want. I already tested the circuit and it works okay. Let me know what you think. 20230330_205102

JohnPattersonConsulting commented 1 year ago

This is a great idea! One suggestion I would have would be to put some kind of regulator on the power supply of the 555, as I have blown up many 555s by connecting them directly to the automotive 12V rail.

Are you able to submit it as a fork or commit, or do I have to upload it directly?

Best regards, John

On Thu, Mar 30, 2023 at 7:54 PM soupflood @.***> wrote:

I built an EFI circuit using your electronic schematic, only I used a MOSFET driven by a TL555 in the gate buffer mode. I would like to send you the schematic I used for you to post it along with your original one, so that other people can also use it if they want. I already tested the circuit and it works okay. Let me know what you think. [image: 20230330_205102] https://user-images.githubusercontent.com/129473643/229011088-179e5b7c-79ab-49ed-bb07-b1b2b37865af.jpg

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soupflood commented 1 year ago

I don't know yet how to upload images the way you said; and I only have the image I attached. If you think the quality is good, then please upload it next to your original schematic. About the 555: yes, it would be ideal to feed it through a proper 12V regulator, however I don't currently have one laying around. The series double diode - parallel double capacitor seems to have done the trick so far because it still works okay. The 555 is supposed to handle up to 15V of VCC, but if it will blow up I will of course consider getting one 12V regulator installed. I guess every car wiring is different; I rather had more problems with the Arduino stability than with the 555: had to solder a 3uF ceramic capacitor across the 5V regulator input's electrolytic capacitor, and replace the 10k resistor leading to the points with a 5k one (just soldered another 10k in parallel to it).

JohnPattersonConsulting commented 1 year ago

Excellent, I just uploaded your design.

By the way, one thing that I found to work well was to add a piece of copper mesh or foil over the top of the ATMega328p and its clock crystal, and to solder this part to the USB port for grounding. After I did this, the Arduino Nano was much more stable and gave less trouble with crashing.

I also removed the small 5V regulator on the back of the Nano, as I found that after a couple months of driving, it randomly started short-circuiting the 5V rail.

Best regards, John

On Sat, Apr 1, 2023 at 9:04 AM soupflood @.***> wrote:

I don't know yet how to upload images the way you said; and I only have the image I attached. If you think the quality is good, then please upload it next to your original schematic. About the 555: yes, it would be ideal to feed it through a proper 12V regulator, however I don't currently have one laying around. The series double diode - parallel double capacitor seems to have done the trick so far because it still works okay. The 555 is supposed to handle up to 15V of VCC, but if it will blow up I will of course consider getting one 12V regulator installed. I guess every car wiring is different; I rather had more problems with the Arduino stability than with the 555: had to solder a 3uF ceramic capacitor across the 5V regulator input's electrolytic capacitor, and replace the 10k resistor leading to the points with a 5k one (just soldered another 10k in parallel to it).

— Reply to this email directly, view it on GitHub https://github.com/JohnPattersonConsulting/DuneBuggyEFI/issues/4#issuecomment-1493033227, or unsubscribe https://github.com/notifications/unsubscribe-auth/AHHYVE3JFXURZAYLYSGFWP3W7BGZRANCNFSM6AAAAAAWOCPXCE . You are receiving this because you commented.Message ID: @.***>

soupflood commented 1 year ago

Thank you for uploading it. What I found to be useful so far, was to keep all Arduino related wires at least one inch away from any spark wires. I guess that even if I screen it like you suggested, it will still be bothered if its wires come too close to the high voltage parts. As far as the on board 5v regulator...I really hope it won't go bad because I'm not even actually using it... And I've already soldered the Arduino board to the "mother"board. Take care.

El sáb., 1 de abr. de 2023 8:08 p. m., JohnPattersonConsulting < @.***> escribió:

Excellent, I just uploaded your design.

By the way, one thing that I found to work well was to add a piece of copper mesh or foil over the top of the ATMega328p and its clock crystal, and to solder this part to the USB port for grounding. After I did this, the Arduino Nano was much more stable and gave less trouble with crashing.

I also removed the small 5V regulator on the back of the Nano, as I found that after a couple months of driving, it randomly started short-circuiting the 5V rail.

Best regards, John

On Sat, Apr 1, 2023 at 9:04 AM soupflood @.***> wrote:

I don't know yet how to upload images the way you said; and I only have the image I attached. If you think the quality is good, then please upload it next to your original schematic. About the 555: yes, it would be ideal to feed it through a proper 12V regulator, however I don't currently have one laying around. The series double diode - parallel double capacitor seems to have done the trick so far because it still works okay. The 555 is supposed to handle up to 15V of VCC, but if it will blow up I will of course consider getting one 12V regulator installed. I guess every car wiring is different; I rather had more problems with the Arduino stability than with the 555: had to solder a 3uF ceramic capacitor across the 5V regulator input's electrolytic capacitor, and replace the 10k resistor leading to the points with a 5k one (just soldered another 10k in parallel to it).

— Reply to this email directly, view it on GitHub < https://github.com/JohnPattersonConsulting/DuneBuggyEFI/issues/4#issuecomment-1493033227 , or unsubscribe < https://github.com/notifications/unsubscribe-auth/AHHYVE3JFXURZAYLYSGFWP3W7BGZRANCNFSM6AAAAAAWOCPXCE

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