Hardware: Stark CMR - dalathegreat/Battery-Emulator GitHub Wiki
Supply voltage (+5VDC - +16VDC) protected with reverse polarity circuitry
Operating current < 300mA @ 3,3VDC when all outputs are activated
Simultaneous USB connection and external power supply supported
All 3V3 logic with resettable over-current protection
Four individually controllable power outputs, equal to the DC input voltage consisting of:
- 1 relay channel, 7A continuous, 12A maximum. Located on the main output 1 connector.
- 3 MOSFET channels, 0,65A continuous, 1,4A maximum with resettable over-current protection.
The MOSFET channels are located on the secondary output connector.
Current specifications are valid at a surrounding temperature of 25°C or below.
- 1 x RS485 channel using Texas Instruments transceiver
- 1 x CAN channel using Texas Instruments transceiver
- 1 x CAN/CAN-FD channel using Microchip technology MCP2518FD controller and Texas Instruments transceiver
All of the above protected using GDT/ESD/TVS discrete components
Easily accessible DIP switches for termination on all three lines
ESP32-WROOM-32E using ESP32-D0WDR2-V3
Xtensa® dual-core 32-bit LX6 microprocessor, up to 240 MHz
448 KB ROM, 520 KB SRAM, 16 KB SRAM in RTC
Equipped with 8MB Flash and 2MB PSRAM
- 1 x logic power indicator (Blue)
- 4 x outputs status indicators (Green: GPIO 25, Yellow: GPIO 33, Orange: GPIO 32, Red: GPIO 23)
- 1 x programmable REG WS2812B (GPIO 4)
All except power indicator available on board as well as on perpendicular plug-in PCB for better visibility
7 available GPIOs (5 freely usable, 1 bootstrapped, 1 conditioned)
SPI/JTAG header (or used as part of the 6 GPIOs)
Maximum current per GPIO must not exceed 20mA
- 1 x USB-C power and data connector
- 3 x DIP-switches toggling individual termination resistors for RS585, CAN and CAN/CAN-FD
- 2 x Momentary switches for SoC manual reset and flash (GPIO-0 to GND) functions
- 1 x JTAG header
Additional information on the Stark CMR and upcoming related products is available at redispose.se where you also have the option to buy the unit
On the project discord you'll find a thread called "Stark Hardware" where you can chat to Stark CMR users.
You're also welcome to contact Johan directly if you have any questions regarding the hardware.
Latest instruction manual SCMR01
Latest instruction manual SCMR02
Follow the quickstart guide to install the Battery-Emulator software onto the board for the initial setup
When updating this board OTA, be sure to select the software marked for this board. The files will be marked like this, signaling that this is Stark hardware
BE_vX.Y.Z_StarkCMR.ota.bin
The board comes with 2 CAN channels, the second one of them being capable of CAN-FD. The board also has an RS485 channel, which can be used for Modbus inverters or RS485 batteries.
The interfaces correspond to the following options in the Battery-Emulator software
- CAN-1 -> Native CAN
- CAN 1L (CAN-LOW)
- CAN 1H (CAN-HIGH)
- CAN-2 -> Native CAN FD
- CAN 2L (CAN-LOW)
- CAN 2H (CAN-HIGH)
- Note, this channel can be used as classic CAN by enabling "Use CanFD as classic CAN" option
- RS485 -> RS485 / Modbus
- RS485 A
- RS485 B
This is an example wiring diagram for connecting the Stark CRM, a Nissan Leaf battery pack, a Fronius inverter and an E-stop button (NC). This diagram shows high side switching contactors which is found in most battery packs. I.e. +12V is "fed into" the battery on the dedicated pins to close the contactors.
Notes: All connections marked GND on the SCMR are joined via the GND plane of the PCB. 5V is the suggested voltage level for the E-stop in this case but it will also work using 12V or 3.3V.
The configuration for the above example would look like this:
The next wiring diagram shows an example for wiring a Renault Zoe battery. This differs from the previous example as the contactors use low side switching, i.e. the contactors will be closed when the dedicated pins from the contactors on the battery are "shorted to ground".
