eyebyesickle wrote: ↑
Mar 01 2019 6:37pm
Yes, this is what I cautioned against as far as the construction went... Good to see you were at least able to inspect.... Let me know if you want to move forward and I will send the Bluetooth model, but I will also need to have you sign an NDA as well if we move forward perfect manufacturers requirements, as we previously discussed.
No NDA, as it would not be compatible with OpenSource. Anyway, the idea would be to fully develop our firmware for it and they would not give us the full "secrets".
The LCD hardware is only one (just like on TSDZ2 various versions), it fully supports Bluetooth but it may be disabled on the firmware. But Bluetooh firmware part is the piece from Nordic that is free available for anyone that uses that Nordic microcontroller, so Bluetooth is pretty straightforward to implement.
I wounder if that LCD could communicate simultaneously with the popular chinese BMS with Bluetooth (the "Smart BMS with Bluetooth") and with mobile app. If so, we could have a system much more integrated, access data/control from each battery pack cells on LCD and mobile app, other than keep controlling TSDZ2.
Anyway, I am busy working on 850C LCD and I will not start developing to SW102 LCD but I could help if other developers want to do it. For instance, the only piece missing is the information on how to control that monochrome graphic LCD and I have the tolls to look at the digital signals and find it, just like I did on 850C LCD.
casainho wrote: ↑
Mar 02 2019 7:47am
I am sharing pictures of the battery pack I built for using with TSDZ2.
I am using the most power density cells available on the market, the LG INR18650-M36 3600mAh - 10A
Using this cells, my pack as 14S3P (14 cells in series and 3 cells in parallel) of 42 cells in total.
This pack has about 525 Wh and weighs only about 2.5 kgs (including the weight of BMS, connectors, etc). My girlfriend wants a light bicycle so I decided to use this cells/battery on his bicycle. Next I will do another for my bicycle and I will keep my older big packs (that use the same cells) to use when we do long rides like near or over 100 kms in a day.
I am using for the first time the chinese popular BMS with Bluetooth, the "Smart BMS with Bluetooth", that we can find in many online shops. This BMS would be very easy to develop firmware for if we want (used Arduino AVR microcontroller and popular battery management IC) but there is a lot of information about it, including the communication protocol.
I think I will need to limit on LCD3 the battery current to be 10 Amps, other way this cells may heat to much and damage quick but I will configure the BMS temperature sensors protection and I will keep a loop at the temperature to find the "max" average current for this cells in 3P.
My girlfriend bicycle:
Developer of the Flexible OpenSource firmware for EBike motor controllers (TSDZ2
) and LCDs (KT-LCD3 and Bafang 850C color LCD).
If you like my work, please consider making a donation. I am being using the donations to buy needed resources for my developments. My paypal: casainho AT gmail.com.