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  1. M

    Are you using fuse in battery harness? What type?

    I've had success with these parts: Fuse holder http://www.digikey.com/product-detail/en/178.6152.0001/F5194-ND/2515821 Fuse http://www.digikey.com/product-detail/en/166.7000.5302/F5168-ND/2515905 Most automotive fuses you find will be rated for 32 volts. When the fuse blows, there could be...
  2. M

    Arduino BMS Shield using TI BQ76PL536A (Update 9/16)

    I used the tutorial found here: http://adamfeuer.com/notes/2013/08/06/building-an-orone-mini-part-2-solder-paste-stencils-using-gerber2graphtec/ I used the settings below with two passes, and a blade setting of 2: --speed 1,1 --force 8,15 The reason it is so precise is because the script...
  3. M

    Arduino BMS Shield using TI BQ76PL536A (Update 9/16)

    I shrunk the cream layer by 2 mil, so the openings are slightly smaller than the pads.
  4. M

    Arduino BMS Shield using TI BQ76PL536A (Update 9/16)

    Thanks! I finished the solder stencil and I think it turned out well: I used a Silhouette Portrait craft cutter, which I got for $80 on Craigslist, and a custom script I found online - it converts paste gerbers to special cut files. All you need is a few mylar overhead transparencies ($20...
  5. M

    Arduino BMS Shield using TI BQ76PL536A (Update 9/16)

    Hey everyone, Just got the PCBs back from OSH Park and they look great. Here are some pictures: http://imgur.com/a/TdqGv#6KqZs40 Tonight I will be ordering the parts I need and trying to make a solder stencil. Wish me luck!
  6. M

    Arduino BMS Shield using TI BQ76PL536A (Update 9/16)

    I haven't gotten the boards back yet - they estimated that they will be shipped September 15th. I haven't placed the balance resistors - they wouldn't fit on the Uno board, but it's a possibility for the future Mega board. In the meantime, I have ordered some equipment to build these, and I'm...
  7. M

    Arduino BMS Shield using TI BQ76PL536A (Update 9/16)

    Posted an update on the first page. Just submitted the prototype board to Osh Park, and they might be built on September 5. Here is a preview: http://imgur.com/a/GaafQ#BHyFR0V
  8. M

    Arduino BMS Shield using TI BQ76PL536A (Update 9/16)

    Hey all, Posted an update on the front page, and reorganized the information in the first post. The PCB should be done pretty soon. I am trying to gauge interest in the board, so let me know in the comments or via PM if you will want one when they're finished.
  9. M

    Arduino BMS Shield using TI BQ76PL536A (Update 9/16)

    Update for 8/20: Spent the last week routing the new board, the traces are a lot tighter with the new components and smaller board size. The board is about 90% routed, so I still think this will be possible. I am moving the EPROM programming functions to a separate small board so I can...
  10. M

    Arduino BMS Shield using TI BQ76PL536A (Update 9/16)

    Just posted an update on the first page. Some of the features that might have to be left off: - You can choose the CS pin used on the board (for example, set it to pin 6, 7, or 8) - Ability to leave board plugged into batteries while not in use I am actively looking for feature suggestions...
  11. M

    Arduino BMS Shield using TI BQ76PL536A (Update 9/16)

    Hi everyone, I just want to point out that I am still working on my own board utilizing the BQ76PL536A and this thread is to discuss this board. I am not collaborating on hardware with dmwahl and mwkeefer, because I have a slightly different vision for my board, but we have shared software. I...
  12. M

    Arduino BMS Shield using TI BQ76PL536A (Update 9/16)

    Glad to see progress has been made in your project. Unfortunately progress on my end will be slow because I'm moving within a month and starting a new job. I don't have the ability to work on hardware right now, but if anyone needs coding advice just let me know. I posted my code in dmwahls...
  13. M

    3-192S Arduino BMS (using BQ76PL536A)

    The chip select pin I assigned on board was being used for the USB host chip to communicate with Android. I recruited that signal to a different pin with sky wires and it worked fine. I would just double check whether there are any signals assigned in the Arduino Uno already.
  14. M

    3-192S Arduino BMS (using BQ76PL536A)

    If anyone wants to take a look, I attached a program that includes a few useful functions. I can edit it a bit later, but it has the basics, including the CRC check that you need to write bytes to registers on the BQ76PL536A...
  15. M

    3-192S Arduino BMS (using BQ76PL536A)

    Hey all, I am working on a similar project, except for the Arduino Mega board. I produced boards and code that work. If you have any questions about code, I have a working implementation that I can share. I haven't converted it to a library, but that might be a good next step.
  16. M

    Arduino BMS Shield using TI BQ76PL536A (Update 9/16)

    I am just using this shield to monitor the cell voltages. The Arduino board is able to take this information and perform other actions. For example, I have a 40 amp, 100 volt solid state relay (http://www.digikey.com/product-detail/en/DC100D40/CC1853-ND/2780513) that can take a 5 volt, 11...
  17. M

    Arduino BMS Shield using TI BQ76PL536A (Update 9/16)

    My plan right now is to write an Arduino library to interface with the device. That way, you can use it and adapt to your own board.
  18. M

    Arduino BMS Shield using TI BQ76PL536A (Update 9/16)

    This is for a university project. We are using the mega ADK to communicate with a Google Nexus 7. It is a three wheeled vehicle, not a bike, so we have room to mount a tablet as a dashboard. As for the high cost, this is a money is little object project, but honestly I think one should spend...
  19. M

    Organic Transit Elf (velo) on kickstarter

    I have met some of the people working in this shop, seems like an awesome project. I had no idea they raised all that money on Kickstarter. They have some vehicles on display sometimes and they look great.
  20. M

    Arduino BMS Shield using TI BQ76PL536A (Update 9/16)

    Since I'm only using this chip for cell monitoring, right now I don't think I will be soldering the tab... I will in future versions if I get a solder paste stencil. I have a friend who is a bit more experienced with surface mount, so he will be doing the QFN chips. I will be attempting the...
  21. M

    Arduino BMS Shield using TI BQ76PL536A (Update 9/16)

    Haha yeah, I left the balance function out because this BMS will only be used when the cells are discharging. I already have a Hyperion charger, and they did a far better job than I ever could.
  22. M

    Arduino BMS Shield using TI BQ76PL536A (Update 9/16)

    I'm definitely considering adding one more BQ in the future. For my vehicle, the maximum allowed pack voltage would be 48 V (it's being used for a competition). The other option is to shrink down to Uno or Due size for a more ubiquitous shield.
  23. M

    Arduino BMS Shield using TI BQ76PL536A (Update 9/16)

    Hi everyone, Just wanted to share a project I'm working on to see if anyone has attempted anything similar or is just interested. I am building a performance / battery monitor for a small electric vehicle and I'm using the Arduino Mega ADK R3 to interface between the vehicle and the sensors /...
  24. M

    Solar panel for boost while coasting?

    Thanks for the thoughts, everyone. These are the things I was hoping to learn. A few more details, if it helps: - the vehicle will already have a body shell and I would most likely be adding individual cells that conform to the body and wiring them together, rather than using a large flat...
  25. M

    Solar panel for boost while coasting?

    Just wanted to begin by saying that Endless Sphere has been an awesome resource for me and I have avoided posting questions to this point because you guys have answered all of them many times over. I thought some people might find this interesting. For some background: I have built a working...
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