Yes, the 40 pin GPIO is the same across the 1 B+, 2, 3, 3B+ and both zero models. One nice thing about the Raspberry Pi Foundation they work very hard at cross board compatibility. Do you have a link I could look at?
This is the ebay listing. If I can add the needed I/O this easily, this may become my battery controller for the entire system. It will become prohibitive to monitor all the battery sticks separately, but if I monitor the weakest one in a group of a dozen or so, I can current limit (with PWM) the entire group to match that weakest unit. I will make an external frequency source for the PWM at about 30% of the cutoff frequency on the Tmos Power FETS, so I will not loose a lot of power in the FET. A common ferquency source should eliminate individul processor variations. I plan to current limit the individual sticks to 2.5 amps; at that drain these cell should last for 15000 recharges.
This board just gives you THREE copies of the GPIO pins, NOT extra GPIO. What kind of signal are you looking for? I am a big fan of adafruit.com for Pi hats or arduino shields etc. Here is a tutorial at adafruit https://learn.adafruit.com/raspberry-pi-analog-to-digital-converters?view=all for reading analog signals on a Raspberry Pi. They have a great learning area.
Thanks, I knew they were in parallel, but planned to steal some pins to enable each separately (would still have to build a PCB, but lots easier, just decoding and a latch for each). I will look at the adafruit.com, because added analog would be very helpful too. Thanks.
I need to stop focusing on building what I need, and look at what is available on the shelf, like the military COTS program, LOL! Hard habit to break....
Nice converter, simple and direct, looks like a PCB again, ROFLOL. Not a problem, surface mount is a lot less money (due to volume I suspect), but that is easy. Looks like they took some I/O pins too. 10 bit is plenty for this control, and I really like the separate analog ground! I need to get some.
Mostly learning Python, but I collect data and would start graphically displaying the data from my solar system, efficiency etc. Eventually I have some small robots to start learning the programming of.
Well, I have my Pi3 in, but I am waiting on the GPIO expansion card, and the memory chip. All fun toys, LOL!
What expansion board did you get?
40-pin Triple GPIO Expansion Board Shield Adapter for Raspberry Pi 2 Model B CO
I know it is for a P2, but they say the GPIO is the same. Hope it works, I will need more IO
Yes, the 40 pin GPIO is the same across the 1 B+, 2, 3, 3B+ and both zero models. One nice thing about the Raspberry Pi Foundation they work very hard at cross board compatibility. Do you have a link I could look at?
https://www.ebay.com/itm/40-pin-Triple-GPIO-Expansion-Board-Shield-Adapter-for-Raspberry-Pi-2-Model-B-CO/292476585772?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649&autorefresh=true
This is the ebay listing. If I can add the needed I/O this easily, this may become my battery controller for the entire system. It will become prohibitive to monitor all the battery sticks separately, but if I monitor the weakest one in a group of a dozen or so, I can current limit (with PWM) the entire group to match that weakest unit. I will make an external frequency source for the PWM at about 30% of the cutoff frequency on the Tmos Power FETS, so I will not loose a lot of power in the FET. A common ferquency source should eliminate individul processor variations. I plan to current limit the individual sticks to 2.5 amps; at that drain these cell should last for 15000 recharges.
This board just gives you THREE copies of the GPIO pins, NOT extra GPIO. What kind of signal are you looking for? I am a big fan of adafruit.com for Pi hats or arduino shields etc. Here is a tutorial at adafruit https://learn.adafruit.com/raspberry-pi-analog-to-digital-converters?view=all for reading analog signals on a Raspberry Pi. They have a great learning area.
Thanks, I knew they were in parallel, but planned to steal some pins to enable each separately (would still have to build a PCB, but lots easier, just decoding and a latch for each). I will look at the adafruit.com, because added analog would be very helpful too. Thanks.
I need to stop focusing on building what I need, and look at what is available on the shelf, like the military COTS program, LOL! Hard habit to break....
Nice converter, simple and direct, looks like a PCB again, ROFLOL. Not a problem, surface mount is a lot less money (due to volume I suspect), but that is easy. Looks like they took some I/O pins too. 10 bit is plenty for this control, and I really like the separate analog ground! I need to get some.
THIS is Nice, and will save me a lot of PWM code. Thanks, this is most helpful!
https://www.adafruit.com/product/2327
I actually have one myself as well as one of there motor controllers. Hoping to do some simple robotics.
Interesting to see how you put together your very own solar production monitoring system.
What is your background before this? @mytechtrail
IT Professional for 30 years, helped small business people keep their computers and networks running, occasionally did some programing.
What do you hope to achieve after this exercise?
Mostly learning Python, but I collect data and would start graphically displaying the data from my solar system, efficiency etc. Eventually I have some small robots to start learning the programming of.