1 Minute per Second Battery Start Rule

[MrAl]

I bet you could write that data to EEPROM in the fuel pump relay uP

Isn’t there a thread on that somewhere ?

Hi again,

I didnt realize you were talking about the EEPROM inside the microcontroller. Been a while since i worked with one.
Most of them today have at least 128 bytes of EEPROM with at least 10 years retention and 10000 write/read cycles.
Yes some interesting data could be stored there.

But since you mentioned this i gave it a little more thought too. Since the ECU is so limited on this car why not design a secondary ECU, or rather, an ECU with just monitoring capabilities. It could be used to store some different electrical activities such as battery voltage and possibly voltage drop across some of the wires which would provide current level data too for charging and even starting. If it monitored the sensors it could store that too. They make large capacity EEPROMS too these days could store a lot of the measurements on that or possibly interface with a SD card which would give a lot of storage space for data.
Might be a small nightmare to wire up though with all the sensors
Be easy to wire to the battery though.

If i knew the exact OBDII protocol i could replace the entire ECU with a new design which could be a lot better than the original.

[RickHaleParker]

There is no EEPROM in my fuel pump relay, YET ha ha.

You could go 1940s old school by adding some electro-mechanical relay memory. Your fuel pump would sound like a sewing machine as the memory changes.

[MrAl]

There is no EEPROM in my fuel pump relay, YET ha ha.

You could go 1940s old school by adding some electro-mechanical relay memory. Your fuel pump would sound like a sewing machine as the memory changes.

Ha ha yeah.

You reminded me of those magnetic core memories. I worked on computer terminals way back in the 1970's and they had ONE ENTIRE PC CARD just for one memory which had about 64 bytes or something like that for storage. That was for super critical data. The main transactions were stored on a backup tape drive about the size of a full tower computer case.
Funny how things changed.
I also had a computer way back that would have done very well to have 10 Megabytes of hard disk but only if you were willing to shell out $400 USD. Wow, that's nuts for today and yes that is 10 Megabytes not Giga, and certainly not Tera. Amazing changes.

[850oldschool]

I like the idea of always-on data logging to an SD card.

[MrAl]

I like the idea of always-on data logging to an SD card.

Yeah that could log battery voltages over months and even years i bet.
I'll have to look into that.
I know it would be fairly easy with an Arduino but i dont think that would be appropriate for a car out in the weather all day and night. Maybe using a raw uC chip that the Arduino uses i have some of them somewhere.

[MrAl]

Hello again,

One think i have to do first is check the lower temperature range of the chips i used in the past. I'll have to look for a lower temperature chip because i've seen temperatures as low as -20 F around New Jersey in the past. A lot of the chips i used in the past were good down to 0 F but that's not good enough. Then again, the one i used with the "blinking single LED voltage meter" had to have been a low temperature part. It's been a while since i did any of this so i have to look a lot of stuff up again.

[RickHaleParker]

You reminded me of those magnetic core memories. I worked on computer terminals way back in the 1970's and they had ONE ENTIRE PC CARD just for one memory which had about 64 bytes or something like that for storage. That was for super critical data. The main transactions were stored on a backup tape drive about the size of a full tower computer case.

The military was still using magnetic core memory back in the early 80s. In the invent of a power interrupt in middle of a battle, you cannot wait for a reload or the data needed to acquire your target.

Recall the disk drives on the DEC PDP11. Something 24" in diameter and held a whopping 5Mb of data but boy they where fast.

I can recall paying $350 for 4 MB of memory. $550 for a US Robotics courier v.everything 56k modem.

[MrAl]

You reminded me of those magnetic core memories. I worked on computer terminals way back in the 1970's and they had ONE ENTIRE PC CARD just for one memory which had about 64 bytes or something like that for storage. That was for super critical data. The main transactions were stored on a backup tape drive about the size of a full tower computer case.

The military was still using magnetic core memory back in the early 80s. In the invent of a power interrupt in middle of a battle, you cannot wait for a reload or the data needed to acquire your target.

Recall the disk drives on the DEC PDP11. Something 24" in diameter and held a whopping 5Mb of data but boy they where fast.

I can recall paying $350 for 4 MB of memory. $550 for a US Robotics courier v.everything 56k modem.

Yeah it's amazing how things changed over the years. Quantum technology will be the next boom im sure. Sensors, etc. There is some disagreement over quantum computers though as to when a big one will be available and what kinds of problems it will be able to handle.

Quantum entanglement is quite interesting too i've looked into that a lot and found out it could be very strange unlike anything we've ever seen before this. I always liked to say though that particle physics is like everything exists in a different world. It's super miniature stuff. I have had people disagree with me but it turns out that's the way it seems to be to this day. Some of it just can not be explained, yet.

The double slit experiments are also quite amazing as is their variations.

[abscate]

You reminded me of those magnetic core memories. I worked on computer terminals way back in the 1970's and they had ONE ENTIRE PC CARD just for one memory which had about 64 bytes or something like that for storage. That was for super critical data. The main transactions were stored on a backup tape drive about the size of a full tower computer case.

The military was still using magnetic core memory back in the early 80s. In the invent of a power interrupt in middle of a battle, you cannot wait for a reload or the data needed to acquire your target.

Recall the disk drives on the DEC PDP11. Something 24" in diameter and held a whopping 5Mb of data but boy they where fast.

I can recall paying $350 for 4 MB of memory. $550 for a US Robotics courier v.everything 56k modem.

I had the big pizza disks on the PDP but they were 12 inch and had 100 kB space. Of course, you got the same usable space because it didn’t come loaded with AOL subscription malware

[RickHaleParker]

Yeah it's amazing how things changed over the years. Quantum technology will be the next boom im sure. Sensors, etc. There is some disagreement over quantum computers though as to when a big one will be available and what kinds of problems it will be able to handle.

I think we are going to see Photonics replace Electronics.

Quantum physics is the driving force behind all the advances in Electronics and Photonics. Without it we would be nowhere close to where we are today.