ML-R Cables

There are 4 types of connectors:

• Molex KK396, for high current, like in ML-R Cable KK396-KK396 5 cm (mrm-kk3.96-3.96-5).
• Molex KK254, for medium current, like in ML-R Cable KK254-KK254 5 cm (mrm-kk2.54-2.54-5).
• CAN Bus, like in MRMS CAN Bus cable 10 cm (mrm-jst-can10).
• Dupont, for low current.

There are different colors of connectors:

• Dark red, for battery voltage.
• Bright red, for 5 V.
• Orange, for 3.3 V.
• Yellow, for voltages lower than 3.3 V.
• Green, for motor and solenoid outputs.

Almost all of the boards have either no or 2 connectors of each type, except Dupont. They are wired pin to pin and You can use any one of them. The idea is to daisy chain the connections. For example, first 5 V cable connects power supply (bright red, Molex KK254) to the same looking connector in MRMS ESP32: Arduino, IMU, eFuse, BT, WiFi, CAN Bus (mrm-esp32), any of the 2 connectors. The second connects MRMS ESP32: Arduino, IMU, eFuse, BT, WiFi, CAN Bus (mrm-esp32) to ML-R 8x8 bicolor display, CAN Bus,UART, 4 switches (mrm-8x8a), etc. There must always be connectors of the same color in one chain. Of course, it would not be fine to connect 5 V (bright red) to 3.3 V (orange) as some damage would occur. Important: although it is obvious that Molex KK254 and KK396 connector fit into appropriate headers in only one way, it is possible to connect them in the opposite direction. That would reverse voltage in the rest of the chain and it is also quite possible that some components may start burning. Mind the direction!

Connect all the Molex KK254 cables, bright red and orange lines, starting from ML-R Power Supply 3x C, voltmeter (mrm-ps3xc). The last orange cable in chain leads to MRMS reflectance sensors 9x, CAN, analog, I2C (mrm-ref-can) and is different from others as reflectance sensor uses Dupont 3.3 V header. Afterwards connect dark red Molex KK396, MRMS Power Supply 3x B (mrm-ps3xb) to MRMS Motor Driver 4x3.6A CAN Bus (mrm-mot4x3.6can). The other KK396 cable is ML-R Cable XT60-KK3.96 10 cm (mrm-xt60-kk3.96-10), which goes into the other dark red header of ML-R Power Supply 3x C, voltmeter (mrm-ps3xc).

Connect CAN Bus cables, too.