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    Cycle Analyst V3.14 Delayed Speed Measurement Bug

    I'm having trouble reading and datalogging vehicle speed during initial vehicle acceleration with the Cycle Analyst. I think there might be a bug in the Cycle Analyst V3.14 firmware. Here is a screenshot to show what is going on. The areas circled in orange show battery current and vehicle...
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    Hacking "JBLTools" Chinese Bluetooth BMS boards

    I don’t have a max continuous current rating but the amount of current you can draw is very low. My first prototype powered the arduino off VCC and the 5V voltage regulator circuit got super hot. Never actually burnt anything out but it sure felt like I was stressing it. That power rail was just...
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    Completed DIY E-Bike Display with a JBD BMS

    Awesome to hear its working out for you and you're enjoying the project. It has been a long time since I've looked at my code so I was worried I wouldn't be of too much help. Good luck
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    3D Printed Cyclone 3000 Motor Spacer

    After installing the Cyclone 3000 mid drive kit, I noticed a somewhat blunt feature on the motor was slightly denting my bike's down tube. To prevent any further denting, I designed and 3D printed a spacer that sits in between the motor and the frame. This part redistributes a point load coming...
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    Completed DIY E-Bike Display with a JBD BMS

    Hi Pedro, Excited to see your interest in this project! 1. This system communicates with the BMS directly via UART. It does not use Bluetooth. From what I've seen online, there is little documentation regarding communicating with the BMS over Bluetooth. As long as the system is grounded with...
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    Completed DIY E-Bike Display with a JBD BMS

    That seems feasible. I've just been watching my cell voltage for SOC but it would be nice to have the Arduino keep track of that for me. Since I'm already saving mileage to the EEPROM memory on the Arduino, it should be easy to calculate the current power draw, multiply it by my sampling time...
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    Completed DIY E-Bike Display with a JBD BMS

    The XT90 anti spark connectors can help a bit but with high potential differences but yeah arcing is sometimes hard to avoid. I have to agree with you that the BMS is most important during design/testing. If you have good cells and treat them well, you should rarely have balancing needs. I'm a...
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    Generic-Chinese-Bluetooth-BMS-communication-protocol

    When developing this project, I initially powered my Arduino off the VCC of the UART port on the BMS that the Bluetooth dongle connects too. Although it worked, I found that a spot on the BMS got VERY hot. Upon further inspection, it looked like the source of heat was a linear voltage regulator...
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    Generic-Chinese-Bluetooth-BMS-communication-protocol

    I actually just completed a project very similar to what you are talking about. I programmed an Arduino nano to read info from the JBD BMS and send that data to a 20x4 LCD display, not quite OLED but gets the job done. Here's a link to my post which has some information about the project and a...
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    Completed DIY E-Bike Display with a JBD BMS

    Not that I know of. simat is the only other person I've seen develop hardware that can communicate with these BMS's and while he has a lot of documentation on what he has done, its far from plug in play. However, If you're interested in embedded systems, this would be a great project to start.
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    Bluetooth DC energy monitor

    Pretty neat project! I remember trying to find "smart" power meters for my ebike but they all seemed pretty expensive. I recently completed a similar project where I found power consumption by communicating with a JBD BMS. While the BMS interface side may not be relevant to you, I did create an...
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    Completed DIY E-Bike Display with a JBD BMS

    When looking for a BMS, I wanted to find one that could display pack data and power on a screen. I was so curious to see how much power my motor drew when riding along with my cell voltages. While there are BMS's out there that can do this, they are expensive and I found the JBD smart BMS and...
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    Hacking "JBLTools" Chinese Bluetooth BMS boards

    That's good to know that the VCC source on the serial output of the BMS is not part of the protection circuit. My current design is to put a switch on the VCC line so that I can easily turn on/off the Arduino. This switch would be located near the LCD screen on the handlebars but I would have to...
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    Hacking "JBLTools" Chinese Bluetooth BMS boards

    Thanks for getting back to me. Here's two images showing what I found on the BMS. It may be hard to see b/c imgur reduces photo upload resolution but it looks like the two components connected to GRND of the Serial Port are fried. PCB design is not my strongest but it looks like GRND and RX and...
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    Hacking "JBLTools" Chinese Bluetooth BMS boards

    Hi Simon, I accidentally shorted my pack with the GRND of the serial output on this BMS and a cell lead wire around 45 Volts. After the short, I tried communicating with the BMS via JBDTools software but made no connection, which hasn't happened before. Usually when the BMS shuts off the pack...
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